10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

—————————————————

FORM 10-Q

—————————————————

 ☒ QUARTERLY QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended June 30, 2021

OR

 ☐
QUARTERLY TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

for the transition period from ________ to ________

STEM, INC.

(Exact name of registrant as specified in its charter)

Delaware	333-251397	85-1972187
(State or Other Jurisdiction of Incorporation)	(Commission File Number)	(IRS Employer Identification No.)

100 California St., 14th Fl, San Francisco, California 94111

(Address of principal executive offices including zip code)

1-877-374-7836

Registrant’s telephone number, including area code

Not Applicable

(Former name, former address and former fiscal year, if changed since last report)

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Common Stock, par value $0.0001	STEM	New York Stock Exchange
Warrants, each whole warrant exercisable for Common Stock at an exercise price of $11.50 per share	STEM WS	New York Stock Exchange

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ☒ No ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes ☒ No ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer”, “accelerated filer”, “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act

Large accelerated filer	☐	Accelerated filer	☐
Non-accelerated filer	☒	Smaller reporting company	☒
Emerging growth company	☒
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.			☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ☐ No ☒

Class	Outstanding as of August 10th, 2021
Common Stock, $0.0001 par value per share	131,008,933

TABLE OF CONTENTS

	Page
Part I. Financial Information	3
Item 1. Financial Statements (Unaudited)	3
Condensed Consolidated Balance Sheets	3
Condensed Consolidated Statements of Operations	4
Condensed Consolidated Statements of Comprehensive Loss	5
Condensed Consolidated Statements of Stockholders’ Equity (Deficit)	6
Condensed Consolidated Statements of Cash Flows	8
Notes to Condensed Consolidated Financial Statements	10
Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations	24
Item 3. Quantitative and Qualitative Disclosures About Market Risk	39
Item 4. Controls and Procedures	39
Part II. Other Information	42
Item 1. Legal Proceedings	42
Item 1A. Risk Factors	42
Item 2. Unregistered Sales of Equity Securities and Use of Proceeds	42
Item 3. Defaults Upon Senior Securities	42
Item 4. Mine Safety Disclosures	42
Item 5. Other Information	42
Item 6. Exhibits	43
Signatures	44

The accompanying notes are an integral part of these condensed consolidated financial statements.

2

Part I. Financial Information

Item 1. Financial Statements (Unaudited)

STEM, INC.

CONDENSED CONSOLIDATED BALANCE SHEETS

(UNAUDITED)

(in thousands, except share and per share amounts)

	June 30, 2021		December 31, 2020
ASSETS
Current assets:
Cash and cash equivalents	$	474,138	$	6,942
Accounts receivable, net	17,833		13,572
Inventory, net	27,167		20,843
Other current assets (includes $206 and $123 due from related parties as of June 30, 2021 and December 31, 2020, respectively)	19,199		7,920
Total current assets	538,337		49,277
Energy storage systems, net	118,216		123,703
Contract origination costs, net	11,668		10,404
Goodwill	1,786		1,739
Intangible assets, net	12,387		12,087
Other noncurrent assets	15,945		8,640
Total assets	$	698,339	$	205,850
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Current liabilities:
Accounts payable	$	17,798	$	13,749
Accrued liabilities	9,177		16,072
Accrued payroll	4,565		5,976
Notes payable, current portion	—		33,683
Convertible promissory notes (includes $— and $45,271 due to related parties as of June 30, 2021 and December 31, 2020, respectively)	—		67,590
Financing obligation, current	15,336		14,914
Deferred revenue, current	37,056		36,942
Other current liabilities (includes $880 and $399 due to related parties as of June 30, 2021 and December 31, 2020, respectively)	1,910		1,589
Total current liabilities	85,842		190,515
Deferred revenue, noncurrent	18,648		15,468
Asset retirement obligation	4,178		4,137
Notes payable, noncurrent	1,719		4,612
Financing obligation, noncurrent	74,496		73,128
Warrant liabilities	303,798		95,342
Lease liability, noncurrent	880		57
Total liabilities	489,561		383,259
Commitments and contingencies (Note 13)
Stockholders’ equity (deficit):
Preferred stock, $0.0001 par value; 1,000,000 shares authorized as of June 30, 2021 and December 31, 2020, respectively; 0 shares issued and outstanding as of June 30, 2021 and December 31, 2020	—		—
Common stock, $0.0001 par value; 500,000,000 shares authorized as of June 30, 2021 and December 31, 2020; 130,768,055 and 40,202,785 issued and outstanding as of June 30, 2021 and December 31, 2020, respectively	13		4
Additional paid-in capital	799,918		230,620
Accumulated other comprehensive loss	(543)		(192)
Accumulated deficit	(590,610)		(407,841)
Total stockholders’ equity (deficit)	208,778		(177,409)
Total liabilities and stockholders’ equity (deficit)	$	698,339	$	205,850

The accompanying notes are an integral part of these condensed consolidated financial statements.

3

STEM, INC.

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(UNAUDITED)

(in thousands, except share and per share amounts)

	Three Months Ended June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
Revenue
Services revenue	$	5,153	$	3,670	$	10,035	$	7,062
Hardware revenue	14,184		709		24,723		1,427
Total revenue	19,337		4,379		34,758		8,489
Cost of revenue
Cost of service revenue	5,809		5,510		12,715		10,255
Cost of hardware revenue	13,655		614		22,286		1,365
Total cost of revenue	19,464		6,124		35,001		11,620
Gross margin	(127)		(1,745)		(243)		(3,131)
Operating expenses:
Sales and marketing	3,913		4,242		6,580		8,646
Research and development	4,827		3,619		9,234		7,032
General and administrative	15,014		2,404		17,706		5,383
Total operating expenses	23,754		10,265		33,520		21,061
Loss from operations	(23,881)		(12,010)		(33,763)		(24,192)
Other income (expense), net:
Interest expense	(3,929)		(5,192)		(10,162)		(9,561)
Loss on extinguishment of debt	(5,064)		—		(5,064)		—
Change in fair value of warrants and embedded derivative	(67,179)		(1,918)		(133,577)		(909)
Other income (expenses), net	(163)		139		(203)		(1,790)
Total other income (expense)	(76,335)		(6,971)		(149,006)		(12,260)
Loss before income taxes	(100,216)		(18,981)		(182,769)		(36,452)
Income tax expense	—		—		—		—
Net loss	$	(100,216)	$	(18,981)	$	(182,769)	$	(36,452)
Net loss per share attributable to common shareholders, basic and diluted	$	(1.00)	$	(0.48)	$	(2.59)	$	(1.14)
Weighted-average shares used in computing net loss per share, basic and diluted	100,611,965		39,801,379		70,684,750		40,209,877

The accompanying notes are an integral part of these condensed consolidated financial statements.

4

STEM, INC.

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS

(UNAUDITED)

(in thousands)

	Three Months Ended June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
Net loss	$	(100,216)	$	(18,981)	$	(182,769)	$	(36,452)
Other comprehensive income:
Foreign currency translation adjustment	(602)		(209)		(351)		242
Total comprehensive loss	$	(100,818)	$	(19,190)	$	(183,120)	$	(36,210)

The accompanying notes are an integral part of these condensed consolidated financial statements.

5

STEM, INC.

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY (DEFICIT)

(UNAUDITED)

(in thousands, except share amounts)

	Convertible Preferred Stock			Series 1 Convertible Preferred Stock			Common Stock			Additional Paid-In Capital		Accumulated Other Comprehensive Income (Loss)		Accumulated Deficit		Total Stockholders’ Equity (Deficit)
	Shares	Amount		Shares	Amount		Shares	Amount
Balance as of December 31, 2020	175,437,783	$	220,563	2,961	$	—	11,228,371	$	—	$	10,061	$	(192)	$	(407,841)	$	(397,972)
Retroactive application of recapitalization (Note 1)	(175,437,783)	(220,563)		(2,961)	—		28,974,414	4		220,559		—		—		220,563
Adjusted balance, beginning of period	—	—		—	—		40,202,785	4		230,620		(192)		(407,841)		(177,409)
Issuance of beneficial conversion feature related to convertible notes (Note 7)	—	—		—	—		—	—		1,126		—		—		1,126
Stock option and stock warrant exercises	—	—		—	—		1,412,025	—		3,147		—		—		3,147
Stock-based compensation	—	—		—	—		—	—		784		—		—		784
Foreign currency translation adjustments	—	—		—	—		—	—		—		251		—		251
Net loss	—	—		—	—		—	—		—		—		(82,553)		(82,553)
Balance as of March 31, 2021	—	—		—	—		41,614,810	4		235,677		59		(490,394)		(254,654)
Merger and PIPE financing (Note 1)	—	—		—	—		70,428,326	7		247,011		—		—		247,018
Conversion of warrants into common stock upon Merger (Note 8)	—	—		—	—		2,759,970	—		60,568		—		—		60,568
Conversion of convertible notes into common stock upon Merger (Note 7)	—	—		—	—		10,921,548	1		77,747		—		—		77,748
Exchange of warrants into common stock (Note 8)	—	—		—	—		4,683,349	1		168,646		—		—		168,647
Issuance of common stock warrants for services (Note 8)	—	—		—	—		—	—		9,183		—		—		9,183
Stock option and stock warrant exercises	—	—		—	—		360,052	—		39		—		—		39
Stock-based compensation	—	—		—	—		—	—		1,047		—		—		1,047
Foreign currency translation adjustments	—	—		—	—		—	—		—		(602)		—		(602)
Net loss	—	—		—	—		—	—		—		—		(100,216)		(100,216)
Balance as of June 30, 2021	—	$	—	—	$	—	130,768,055	$	13	$	799,918	$	(543)	$	(590,610)	$	208,778

The accompanying notes are an integral part of these condensed consolidated financial statements.

6

	Convertible Preferred Stock			Series 1 Convertible Preferred Stock			Common Stock			Additional Paid-In Capital		Accumulated Other Comprehensive Income (Loss)		Accumulated Deficit		Total Stockholders’ Deficit
	Shares	Amount		Shares	Amount		Shares	Amount
Balance as of December 31, 2019	191,139,933	$	231,129	2,961	$	—	9,392,682	$	—	$	3,339	$	54	$	(259,054)	$	(255,661)
Retroactive application of recapitalization (Note 1)	(191,139,933)	(231,129)		(2,961)	—		33,796,513	3		231,126		—		—		231,129
Adjusted balance, beginning of period	—	—		—	—		43,189,195	3		234,465		54		(259,054)		(24,532)
Effect of exchange transaction	—	—		—	—		(3,448,648)	—		(10,605)		—		7,337		(3,268)
Issuance of common stock upon exercise of stock options and warrants	—	—		—	—		15,457	—		21		—		—		21
Stock-based compensation	—	—		—	—		—	—		456		—		—		456
Foreign currency translation adjustments	—	—		—	—		—	—		—		451		—		451
Net loss	—	—		—	—		—	—		—		—		(17,471)		(17,471)
Balance as of March 31, 2020	—	—		—	—		39,756,004	3		224,337		505		(269,188)		(44,343)
Issuance of common and preferred stock upon exercise of stock options and warrants	—	—		—	—		—	—		168		—		—		168
Issuance of common stock upon exercise of stock options and warrants	—	—		—	—		87,942	—		4		—		—		4
Stock-based compensation	—	—		—	—		—	—		476		—		—		476
Foreign currency translation adjustments	—	—		—	—		—	—		—		(209)		—		(209)
Net loss	—	—		—	—		—	—		—		—		(18,981)		(18,981)
Balance as of June 30, 2020	—	$	—	—	$	—	39,843,946	$	3	$	224,985	$	296	$	(288,169)	$	(62,885)

The accompanying notes are an integral part of these condensed consolidated financial statements.

7

STEM, INC.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(UNAUDITED)

(in thousands)

	Six Months Ended June 30,
	2021		2020
OPERATING ACTIVITIES
Net loss	$	(182,769)	$	(36,452)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization expense	10,315		7,918
Non-cash interest expense, including interest expenses associated with debt issuance costs	7,119		4,570
Stock-based compensation	1,784		932
Change in fair value of warrant liability and embedded derivative	133,577		909
Noncash lease expense	334		286
Accretion expense	112		160
Impairment of energy storage systems	1,275		947
Issuance of warrants for services	9,183		—
Changes in operating assets and liabilities:
Accounts receivable	(4,219)		2,212
Inventory	(6,323)		(6,340)
Other assets	(16,924)		(2,691)
Contract origination costs	(1,650)		(1,383)
Accounts payable and accrued expenses	3,292		412
Deferred revenue	3,294		12,308
Lease liabilities	(289)		(310)
Other liabilities	56		25
Net cash used in operating activities	(41,833)		(16,497)
INVESTING ACTIVITIES
Purchase of energy storage systems	(5,603)		(7,555)
Capital expenditures on internally-developed software	(2,693)		(2,628)
Purchase of property and equipment	(300)		—
Net cash used in investing activities	(8,596)		(10,183)
FINANCING ACTIVITIES
Proceeds from exercise of stock options and warrants	2,933		54
Net contributions from Merger and PIPE financing, net of transaction costs of $58,061	550,322		—
Proceeds from financing obligations	4,929		8,391
Repayment of financing obligations	(4,609)		(4,267)
Proceeds from issuance of convertible notes, net of issuance costs of $8 and $911 for the six months ended June 30, 2021 and 2020, respectively	1,118		14,050
Proceeds from issuance of notes payable, net of issuance costs of $101 and $1,502 for the six months ended June 30, 2021 and 2020, respectively	3,940		23,498
Repayment of notes payable	(41,446)		(19,665)
Net cash provided by financing activities	517,187		22,061
Effect of exchange rate changes on cash and cash equivalents	438		(176)
Net increase (decrease) in cash and cash equivalents	467,196		(4,795)
Cash and cash equivalents, beginning of period	6,942		12,889
Cash and cash equivalents, end of period	$	474,138	$	8,094

The accompanying notes are an integral part of these condensed consolidated financial statements.

8

SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash paid for interest	$	7,131	$	4,534
NON-CASH INVESTING AND FINANCING ACTIVITIES
Change in asset retirement costs and asset retirement obligation	$	71	$	76
Exchange of warrants for common stock	$	168,647	$	—
Conversion of warrants upon merger	$	60,568	$	—
Conversion of convertible notes upon merger	$	77,748	$	—
Conversion of accrued interest into outstanding note payable	$	337	$	128
Right-of-use asset obtained in exchange for lease liability	$	1,230	$	—
Settlement of warrant liability into preferred stock due to exercise	$	253	$	—
Issuance of warrants upon debt modification	$	—	$	168
Stock-based compensation capitalized to internal-use software	$	47	$	—

The accompanying notes are an integral part of these condensed consolidated financial statements.

9

STEM, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

1.BUSINESS

Description of the Business

Stem, Inc. and its subsidiaries (together, “Stem” or the “Company”) is an energy technology company that creates innovative technology services that transform the way energy is distributed and consumed. Through its technology, the Company enables businesses to control their electricity expense and helps the electrical grid be more efficient in managing peak usage. The Company operated as Rollins Road Acquisition Company (f/k/a Stem, Inc.) (“Legacy Stem”) prior to the Merger (as defined below).

Stem, Inc. was incorporated on March 16, 2009 in the State of Delaware and is headquartered in San Francisco, California.

Star Peak Acquisition Corp. Merger

On December 3, 2020, the Company entered into an Agreement and Plan of Merger (the “Merger Agreement”) with Star Peak Transition Corp. (“STPK”, prior to the closing of the Merger and the “New Stem”, following the closing of the Merger), an entity listed on the New York Stock Exchange under the trade symbol “STPK”, and STPK Merger Sub Corp., a Delaware corporation and wholly owned subsidiary of STPK (“Merger Sub”), providing for, among other things, and subject to the conditions therein, the combination of the Company and STPK pursuant to the merger of Merger Sub with and into the Company with the Company continuing as the surviving entity (the “Merger”).

On April 28, 2021, shareholders of STPK approved the Merger, under which Stem received approximately $550.3 million, net of fees and expenses as follows:

	Recapitalization
Cash — STPK trust and working capital cash	$	383,383
Cash — PIPE	225,000
Less: transaction costs and advisory fees paid	(58,061)
Merger and PIPE financing	$	550,322

Immediately prior to the closing of the Merger, (i) all issued and outstanding shares of Legacy Stem preferred stock, par value $0.00001 per share (the “Legacy Stem Preferred Stock”), were converted into shares of Legacy Stem common stock, par value $0.000001 per share (the “Legacy Stem Common Stock”) in accordance with Legacy Stem’s amended and restated certificate of incorporation, (ii) all outstanding convertible promissory notes of Legacy Stem (the “Legacy Stem Convertible Notes”) were converted into Legacy Stem Preferred Stock in accordance with the terms of the Legacy Stem Convertible Notes and (iii) certain warrants issued by Legacy Stem to purchase Legacy Stem Common Stock and Legacy Stem Preferred Stock (the “Legacy Stem Warrants”) were exercised by holders into Legacy Stem Common Stock in accordance with the terms thereof. Upon the consummation of the Merger, each share of Legacy Stem common stock then issued and outstanding was canceled and converted into the right to receive shares of Class A common stock of Stem using an exchange ratio of 4.6432 (the “Exchange Ratio”).

In connection with the execution of the Merger Agreement, STPK entered into separate subscription agreements (each, a “Subscription Agreement”) with a number of investors (each a “Subscriber”), pursuant to which the Subscribers agreed to purchase, and STPK agreed to sell to the Subscribers, an aggregate of 22,500,000 shares of common stock (the “PIPE Shares”), for a purchase price of $10 per share and an aggregate purchase price of $225.0 million, in a private placement pursuant to the subscription agreements (the “PIPE”). The PIPE investment closed simultaneously with the consummation of the Merger. The Merger is accounted for as a reverse recapitalization in accordance with GAAP. Under this method of accounting, STPK was treated as the “acquired” company for financial reporting purposes. Accordingly, for accounting purposes, the Merger was treated as the equivalent of Stem issuing stock for the net assets of STPK, accompanied by a recapitalization. The net liabilities of STPK of $304.0 million, comprised primarily of the warrant liabilities associated with the Public and Private Placement Warrants discussed in Note 8, are stated at historical cost, with no goodwill or other intangible assets recorded.

10

STEM, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

Liquidity and Going Concern

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) and with the instructions to Form 10-Q and Article 10 of the Regulation S-X, assuming the Company will continue as a going concern. As of June 30, 2021, the Company had cash and cash equivalents of $474.1 million, an accumulated deficit of $590.6 million and net working capital of $452.5 million, with $15.3 million of financing obligation coming due within the next 12 months. During the six months ended June 30, 2021, the Company incurred a net loss of $182.8 million and had negative cash flows from operating activities of $41.8 million. However, the Merger provided the Company with a significant amount of cash proceeds and, as such, the Company believes that its cash position, inclusive of funds raised with the Merger, is sufficient to meet capital and liquidity requirements for at least the next 12 months after the date that the financial statements are available to be issued.

The Company’s business prospects are subject to risks, expenses, and uncertainties frequently encountered by companies in the early stages of commercial operations. Prior to the Merger, the Company had been funded primarily by equity financings, convertible promissory notes and borrowings from affiliates. The attainment of profitable operations is dependent upon future events, including obtaining adequate financing to complete the Company’s development activities, securing adequate supplier relationships, building its customer base, successfully executing its business and marketing strategy, and hiring and retaining appropriate personnel. Failure to generate sufficient revenues, achieve planned gross margins and operating profitability, control operating costs, or secure additional funding may require the Company to modify, delay or abandon some of its planned future expansion or development, or to otherwise enact operating cost reductions available to management, which could have a material adverse effect on the Company’s business, operating results and financial condition.

COVID-19

In March 2020, the World Health Organization declared the outbreak of the novel coronavirus disease (“COVID-19”) as a pandemic, adversely impacting global commercial activity and greatly disrupting supply chains and the manufacturing, delivery and installation of energy storage systems worldwide. As a result, we adjusted certain aspects of our operations to protect our employees and customers while still meeting customers’ needs for vital technology. Government and business responses to COVID-19, along with the rise of the COVID-19 Delta variant and resurgence of related disruptions, could have a continued material adverse impact on economic and market conditions and trigger a period of continued global economic slowdown. The continued uncertainty and fluidity of this situation precludes any predication as to the extent and the duration of the economic impact of government and business responses to COVID-19 and the Delta variant, and therefore present material uncertainty and risk with respect to the Company and its performance and could materially and adversely affect our business, financial condition, and results of operations.

2.SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Basis of Presentation

The accompanying unaudited consolidated financial statements of the Company have been prepared in accordance with GAAP for interim reporting and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, the condensed balance sheet at December 31, 2020 has been derived from the audited financial statements at that date, but certain notes or other information that are normally required by GAAP have been omitted if they substantially duplicate the disclosures contained in the Company’s annual audited consolidated financial statements. In the opinion of Stem management, all adjustments considered necessary for a fair statement of the results for the interim period presented have been included in the accompanying unaudited financial statements. The consolidated financial statements include the accounts of the Company, its wholly-owned subsidiaries, and consolidated variable interest entities (“VIEs”). All intercompany balances and transactions have been eliminated in consolidation. These unaudited condensed financial statements should be read in conjunction with the Company’s audited financial statements for the year ended December 31, 2020. Operating results three and for the six-month period ended June 30, 2021 are not necessarily indicative of the results that may be expected for the full year ending December 31, 2021 or for any other future year.

11

STEM, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

Use of Estimates

The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the consolidated financial statements, and the reported amounts of revenues and expenses during the reporting period. The Company bases its estimates on historical experience and on various other assumptions believed to be reasonable. Actual results could differ from those estimates and such differences could be material to the financial position and results of operations.

Significant estimates and assumptions reflected in these consolidated financial statements include, but are not limited to, depreciable life of energy systems; the amortization of financing obligations; deferred commissions and contract fulfillment costs; the valuation of energy storage systems, internally developed software, and asset retirement obligations; and the fair value of equity instruments, equity-based instruments, warrant liabilities and embedded derivatives.

Segment Information

Operating segments are defined as components of an entity for which discrete financial information is available that is regularly reviewed by the Chief Operating Decision Maker (“CODM”) in deciding how to allocate resources to an individual segment and in assessing performance. Our Chief Executive Officer is the CODM. The CODM reviews financial information presented on a consolidated basis for purposes of making operating decisions, allocating resources, and evaluating financial performance. As such, we have determined that the Company operates as one operating segment that is focused exclusively on innovative technology services that transform the way energy is distributed and consumed. Net assets outside of the U.S. were less than 10% of total net assets as of June 30, 2021 and December 31, 2020.

Significant Customers

A significant customer represents 10% or more of the Company’s total revenue or accounts receivable, net balance at each respective reporting date. For each significant customer, revenue as a percentage of total revenue and accounts receivable as a percentage of total accounts receivable are as follows:

	Accounts Receivable				Revenue			Revenue
	June 30,		December 31,		Three Months Ended June 30,			Six Months Ended June 30,
	2021		2020		2021		2020	2021		2020
Customers:
Customer A	10	%	30	%	27	%	*	15	%	*
Customer B	*		20	%	10	%	*	*		*
Customer C	17	%	17	%	*		*	*		*
Customer D	*		*		*		*	15	%	*
Customer E	*		*		*		*	*		12	%
Customer F	10	%	*		25	%	*	14	%	*
Customer G	16	%	*		*		*	*		*

*Total less than 10% for the respective period

Fair Value of Financial Instruments

Assets and liabilities recorded at fair value in the consolidated financial statements are categorized based upon the level of judgment associated with the inputs used to measure their fair value. The fair value of the Company’s financial assets and liabilities reflects management’s estimate of amounts that the Company would have received in connection with the sale of the assets or paid in connection with the transfer of the liabilities in an orderly transaction between market participants at the measurement date. In connection with measuring the fair value of its assets and liabilities, the Company seeks to maximize the use of observable inputs (market data obtained from independent sources) and to minimize the use of unobservable inputs (internal assumptions about how market participants would price assets and liabilities).

12

STEM, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

Hierarchical levels which are directly related to the amount of subjectivity associated with the inputs to the valuation of these assets or liabilities are as follows:

Level 1 — Unadjusted quoted prices in active markets for identical assets or liabilities that the Company has the ability to access as of the measurement date.

Level 2 — Inputs other than quoted prices included within Level 1 that are directly observable for the asset or liability or indirectly observable through corroboration with observable market data.

Level 3 — Unobservable inputs for the asset or liability only used when there is little, if any, market activity for the asset or liability at the measurement date.

This hierarchy requires the Company to use observable market data, when available, and to minimize the use of unobservable inputs when determining fair value. Assets and liabilities measured at fair value are classified in their entirety based on the lowest level of input that is significant to their fair value measurement. The Company’s assessment of the significance of a specific input to the fair value measurement in its entirety requires management to make judgments and consider factors specific to the asset or liability.

Financial assets and liabilities held by the Company measured at fair value on a recurring basis as of June 30, 2021 and December 31, 2020 include cash and cash equivalents and warrant liabilities.

Recently Adopted Accounting Standards

In August 2018, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework — Changes to the Disclosure Requirements for Fair Value Measurement. The amendments applicable to the Company on the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements and the narrative description of measurement uncertainty should be prospectively applied in the initial fiscal year of adoption. All other amendments applicable to the Company should be applied retrospectively to all periods presented upon their effective date. The Company adopted ASU 2018-13 as of January 1, 2020. The Company’s disclosures related to its level 3 financial instruments were not materially impacted for the periods presented. See Note 4, Fair Value Measurements, for more information.

In August 2018, the FASB issued ASU 2018-15, Intangibles — Goodwill and Other — Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract (“ASU 2018-15”). The intent of this pronouncement is to align the requirements for capitalizing implementation costs incurred in a cloud computing arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software as defined in ASC 350-40. Under ASU 2018-15, the capitalized implementation costs related to a cloud computing arrangement will be amortized over the term of the arrangement and all capitalized implementation amounts will be required to be presented in the same line items of the financial statements as the related hosting fees. ASU 2018-15 is effective for public and private companies’ fiscal years beginning after December 15, 2019, and December 15, 2020, respectively, and interim periods within those fiscal years, with early adoption permitted. The Company adopted ASU 2018-15 as of January 1, 2021. The adoption did not have a material impact to the Company’s condensed consolidated financial statements.

Recently Issued Accounting Standards

In June 2016, the FASB issued ASU 2016-13, Financial instruments — Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, and subsequent related ASUs, which amends the guidance on the impairment of financial instruments by requiring measurement and recognition of expected credit losses for financial assets held. This ASU is effective for public and private companies’ fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2019, and December 15, 2022, respectively. The Company expects to adopt ASU 2016-13 under the private company transition guidance beginning January 1, 2023 and is currently assessing the impact, if any, the guidance will have on the Company’s consolidated financial statements.

13

STEM, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

In December 2019, the FASB issued ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes (“ASU 2019-12”). ASU 2019-12 removes certain exceptions to the general principles in Topic 740 and also clarifies and amends existing guidance to improve consistent application. ASU 2019-12 will be effective for public entities for interim and annual periods beginning after December 15, 2020, with early adoption permitted. ASU 2019-12 will be effective for private entities for annual periods beginning after December 15, 2021, and interim periods beginning after December 15, 2020, with early adoption permitted. The Company plans to adopt ASU 2019-12 for the fiscal year beginning January 1, 2022 and is currently assessing the impact, if any, the guidance will have on the Company's consolidated financial statements.

In August 2020, the FASB issued ASU 2020-06, Debt — Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging — Contracts in Entity's Own Equity (Subtopic 815-40) — Accounting For Convertible Instruments and Contracts in an Entity's Own Equity. The ASU simplifies accounting for convertible instruments by removing major separation models required under current GAAP. Consequently, more convertible debt instruments will be reported as a single liability instrument with no separate accounting for embedded conversion features. The ASU removes certain settlement conditions that are required for equity contracts to qualify for the derivative scope exception, which will permit more equity contracts to qualify for it. The ASU also simplifies the diluted net income per share calculation in certain areas. The new guidance is effective for annual and interim periods beginning after December 15, 2023, and early adoption is permitted for fiscal years beginning after December 15, 2020, and interim periods within those fiscal years. The Company plans to adopt 2020-06 for the fiscal year beginning January 1, 2024 and is currently evaluating the impact that this new guidance will have on the Company's financial statements.

3.REVENUE

The Company generates revenue through two types of arrangements with customers, host customer arrangements and partnership arrangements. The Company recognizes revenue under these arrangements as described below.

Host Customer Arrangements

Host customer contracts are generally entered into with commercial entities who have traditionally relied on power supplied directly from the grid. Host customer arrangements consist of a promise to provide energy optimization services through the Company’s proprietary SaaS platform coupled with a dedicated energy storage system owned and controlled by the Company throughout the term of the contract. The host customer does not obtain legal title to, or ownership of the dedicated energy storage system at any point in time. The host customer is the end consumer of the energy that directly benefits from the energy optimization services provided by the Company. The term for the Company’s contracts with host customers generally ranges from 5 to 10 years, which may include certain renewal options to extend the initial contract term or certain termination options to reduce the initial contract term.

Although the Company installs an energy storage system at the host customer site in order to provide the energy optimization services, the Company determined it has the right to direct how and for what purpose the asset is used through the operation of its SaaS platform and, as such, retains control of the energy storage system; therefore, the contract does not contain a lease. The Company determined the various energy optimization services provided throughout the term of the contract, which may include services such as remote monitoring, performance reporting, preventative maintenance and other ancillary services necessary for the safe and reliable operation of the energy storage system, are part of a combined output of energy optimization services and the Company provides a single distinct combined performance obligation representing a series of distinct days of services.

The Company determines the transaction price at the outset of the arrangement, primarily based on the contractual payment terms dictated by the contract with the customer. Fees charged to customers for energy optimization services generally consist of recurring fixed monthly payments throughout the term of the contract. In certain arrangements, the transaction price may include incentive payments that are earned by the host customer from utility companies in relation to the services provided by the Company. Under such arrangements, the rights to the incentive payments are assigned by the host customer to the Company. These incentives may be in the form of fixed upfront payments, variable monthly payments, or annual performance-based payments over the first five years of the customer contract term. Incentive payments may be contingent on approval from utility companies or actual future performance of the energy storage system.

14

STEM, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

Substantially all of the Company’s arrangements provide customers the unilateral ability to terminate for convenience prior to the conclusion of the stated contractual term or the contractual term is shorter than the estimated benefit period, which the Company has determined to be 10 years based on the estimated useful life of the underlying energy storage systems and the period over which the customer can benefit from the energy optimization services utilizing such energy storage systems. In these instances, the Company determined that upfront incentive payments received from its customers represent a material right that is, in effect, an advance payment for future energy optimization services to be recognized throughout the estimated benefit period. In contracts where the customer does not have the unilateral ability to terminate for convenience without a penalty during the estimated benefit period, the Company determined the upfront incentive payments do not represent a material right for services provided beyond the initial contractual period and are therefore a component of the initial transaction price. The Company revisits its estimate of the benefit period each reporting period. The Company’s contracts with host customers do not contain a significant financing component.

The Company transfers control of its energy optimization services to its customers continuously throughout the term of the contract (a stand-ready obligation) and revenue is recognized ratably as control of these services is transferred to its customers, in an amount that reflects the consideration the Company expects to be entitled to in exchange for its services. Monthly incentive payments based on the performance of the energy storage system are allocated to the distinct month in which they are earned because the terms of the payments relate specifically to the outcome from transferring the distinct time increment (month) of service and because such amounts reflect the fees to which the Company expects to be entitled for providing energy optimization services each period, consistent with the allocation objective. Annual variable performance- based payments are estimated at the inception in the transaction price using the expected value method, which takes into consideration historical experience, current contractual requirements, specific known market events and forecasted energy storage system performance patterns, and the Company recognizes such payments ratably using a time-based measure of progress of days elapsed over the term of the contract to the extent that it is probable that a significant reversal of the cumulative revenue recognized will not occur in a future period. At the end of each reporting period, the Company reassesses its estimate of the transaction price. The Company does not begin recognition of revenue until the energy storage system is live (i.e., provision of energy optimization services has commenced) or, as it relates to incentive payments, when approval has been received from the utility company if later.

Partnership Arrangements

Partnership arrangements consist of promises to transfer inventory in the form of an energy storage system to a solar plus storage project developer and separately provide energy optimization services as described previously to the ultimate owner of the project after the developer completes the installation of the project. Under partnership arrangements, the Company’s customer is the solar plus storage project developer. The customer obtains legal title to along with ownership and control of the inventory upon delivery and the customer is responsible for the installation of the project. Once installation of the project is complete, the owner of the solar plus storage project provides energy to the end consumer through a separate contractual arrangement directly with the end consumer. The term for the Company’s contracts with customers under partnership arrangements generally ranges from 10 to 20 years.

The Company determined the promise to deliver the inventory as a component of the solar plus storage project for which the customer is responsible to develop is a separate and distinct performance obligation from the promise to provide energy optimization services.

The Company determines the transaction price at the outset of the arrangement, primarily based on the contractual payment terms dictated by the contract with the customer. Fees charged for the sale of inventory generally consist of fixed fees payable upon or shortly after successful delivery to the customer. Fees charged to customers for energy optimization services consist of recurring fixed monthly payments throughout the term of the contract. The Company is responsible for designing, procuring, delivering and ensuring the proper components are provided in accordance with the requirements of the contract. Although the inventory is purchased by the Company from a third-party manufacturer, the Company determined it obtains control of the inventory prior to delivery to the customer and is the principal in the arrangement. The Company is fully responsible for responding to and correcting any customer issues related to the delivery of the inventory. The Company holds title and assumes all risks of loss associated with the inventory until the customer accepts the inventory. The Company is primarily responsible for fulfilling the delivery of the inventory to the customer, assumes substantial inventory risks and has discretion in the pricing charged to the customer. The Company has not entered into any partnership arrangements where it is not the principal in the transaction.

15

STEM, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

The Company allocates revenue between the hardware and energy storage services performance obligations based on the standalone selling price of each performance obligation. The standalone selling price for the hardware is established based on observable pricing. The standalone selling price for the energy optimization services is established using a residual value approach due to the significant variability in the services provided to each individual customer based on the specific requirements of each individual project and the lack of observable standalone sales of such services. The Company’s partnership arrangements do not contain a significant financing component.

The Company transfers control of the inventory upon delivery and simultaneous transfer of title to the customer. The Company transfers control of its energy optimization services to its customers continuously throughout the term of the contract (a stand-ready obligation), which does not commence until the customer successfully completes the installation of the project. As a result, the time frame between when the Company transfers control of the inventory to the customer upon delivery is generally several months, and can be in excess of one year, before the Company is required to perform any subsequent energy optimization services. Revenue is recognized ratably as control of these services is transferred to its customers based on a time-based output measure of progress of days elapsed over the term of the contract, in an amount that reflects the consideration the Company expects to be entitled to in exchange for its services.

In some partnership arrangements, the Company charges shipping fees for the inventory. The Company accounts for shipping as a fulfillment activity, since control transfers to the customer after the shipping is complete and includes such amounts within cost of revenue.

Disaggregation of Revenue

The following table provides information on the disaggregation of revenue as recorded in the consolidated statements of operations (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
Partnership hardware revenue	$	14,184	$	709	$	24,723	$	1,427
Partnership service revenue	42		—		79		—
Host customer service revenue	5,111		3,670		9,956		7,062
Total revenue	$	19,337	$	4,379	$	34,758	$	8,489

Remaining Performance Obligations

Remaining performance obligations represent contracted revenue that has not been recognized, which include contract liabilities (deferred revenue) and amounts that will be billed and recognized as revenue in future periods. As of June 30, 2021, the Company had $189.8 million of remaining performance obligations, and the approximate percentages expected to be recognized as revenue in the future are as follows (in thousands):

	Total remaining performance obligations		Percent Expected to be Recognized as Revenue
			Less than one year		Two to five years		Greater than five year
(in thousands, except percentages)
Service revenue	$	130,564	13	%	50	%	37	%
Hardware revenue	59,238		100	%	—	%	—	%
Total revenue	$	189,802

16

STEM, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

Contract Balances

Deferred revenue primarily includes cash received in advance of revenue recognition related to energy optimization services and incentives. The following table presents the changes in the deferred revenue balance during the six months ended June 30, 2021 (in thousands):

Beginning balance as of January 1, 2021	$	52,410
Upfront payments received from customers	25,146
Upfront or annual incentive payments received	2,959
Revenue recognized related to amounts that were included in beginning balance of deferred revenue	(19,457)
Revenue recognized related to deferred revenue generated during the period	(5,354)
Ending balance as of June 30, 2021	$	55,704

4.FAIR VALUE MEASUREMENTS

Fair value accounting is applied for all financial assets and liabilities that are recognized or disclosed at fair value in the financial statements on a recurring basis. At June 30, 2021 and December 31, 2020, the carrying amount of accounts receivable, other current assets, other assets, accounts payable, and accrued and other current liabilities approximated their estimated fair value due to their relatively short maturities.

The following table provides the financial instruments measured at fair value (in thousands):

	June 30, 2021
	Level 1		Level 2		Level 3		Total
Assets
Cash equivalents:
Money market fund	$	225,795	$	—	$	—	$	225,795
Liabilities
Public warrant liability	$	303,798	$	—	$	—	$	303,798

	December 31, 2020
	Level 1		Level 2		Level 3		Total
Assets
Cash equivalents:
Money market fund	$	67	$	—	$	—	$	67
Liabilities
Convertible preferred stock warrant liability	$	—	$	—	$	95,342	$	95,342

The Company’s money market funds are classified as Level 1 because they are valued using quoted market prices. The convertible preferred stock warrant liabilities are defined as Level 3 in the fair value hierarchy as the valuations are based on significant unobservable inputs, which reflect the Company’s own assumptions incorporated in valuation techniques used to determine fair value; further discussion of these assumptions is set forth below. There were no transfers into or out of Level 3 of the fair value hierarchy during the periods presented.

Convertible Preferred Stock Warrant Liabilities

As discussed in Note 8, upon effectiveness of the Merger, substantially all of the outstanding convertible preferred stock warrants were converted into shares of Class A common stock of Stem. As such, the associated warrant liability was reclassified to additional paid-in-capital upon the Merger and was no longer an outstanding Level 3 financial instrument as of June 30, 2021. The fair value of the convertible preferred stock warrants as of June 30, 2020 was determined using the Black-Scholes method as well as a discount for lack of marketability. Black-Scholes inputs used to value the warrants are based on information from purchase agreements and within valuation reports prepared by an independent third party for the Company. Inputs include exercise price, volatility, fair value of common or preferred stock, expected dividend rate and risk-free interest rate.

17

STEM, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

The key assumptions used for the valuation of the preferred stock warrant liabilities upon remeasurement were as follows:

	Six Months Ended June 30,
	2020
Volatility	75.0	%
Risk-free interest rate	16.0	%
Expected term (in years)	2.0
Dividend yield	—	%
Discount for lack of marketability	19.3	%

The following table presents the changes in the liability for warrants on convertible preferred stock during the six months ended June 30, 2021 (in thousands):

	Convertible Warrant Stock Liability
Balance as of December 31, 2020	$	95,342
Changes in estimated fair value	133,577
Assumption of warrant liability upon Merger	303,221
Conversion of warrants upon Merger	(59,442)
Exchange of warrants	(168,647)
Exercised warrants	(253)
Balance as of June 30, 2021	$	303,798

5.ENERGY STORAGE SYSTEMS, NET

Energy Storage Systems, Net

Energy storage systems, net, consists of the following (in thousands):

	June 30, 2021
Energy storage systems placed into service	$	144,754
Less: accumulated depreciation	(39,848)
Energy storage systems not yet placed into service	13,310
Total energy storage systems, net	$	118,216

Depreciation expense for energy storage systems was approximately $3.6 million and $3.4 million within cost of service revenue for the three months ended June 30, 2021 and 2020, respectively, and approximately $7.3 million and $5.7 million within cost of service revenue for the six months ended June 30, 2021 and 2020, respectively.

6.NOTES PAYABLE

Revolving Loan Due to SPE Member

In April 2017, the Company entered into a revolving loan agreement with an affiliate of a member of certain of the Company’s special purpose entities (“SPE”). This agreement was, from time to time, subsequently amended. The purpose of this revolving loan agreement was to finance the Company’s purchase of hardware for its various energy storage system projects. As of the beginning of 2020, the agreement had a total revolving loan capacity of $45.0 million that bore fixed interest at 10% with a maturity date of June 2020.

18

STEM, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

In May 2020, concurrent with the 2020 Credit Agreement discussed below, the Company entered into an amendment to the revolving loan agreement, which reduced the loan capacity to $35.0 million and extended the maturity date to May 2021. The amendment increased the fixed interest rate for any borrowings outstanding more than nine months to 14% thereafter. Additionally, under the original terms of the revolving loan agreement, the Company was able to finance 100% of the value of the hardware purchased up to the total loan capacity. The amendment reduced the advance rate to 85%, with an additional reduction to 70% in August 2020. The amendment was accounted for as a modification of the debt, which did not have a material impact on the condensed consolidated financial statements. As of December 31, 2020, the Company had $7.4 million outstanding under the revolving loan agreement. In April 2021, the Company repaid the remaining outstanding balance of this facility with the proceeds received from the Merger. The facility was terminated after the repayment in April 2021.

Term Loan Due to SPE Member

In December 2018, the Company entered into a term loan in the amount of $13.3 million with an affiliate of a member of certain SPEs with the Company. As of the beginning of 2020, the term loan bore fixed interest of 12.5% on the outstanding principal balance with a final balloon payment of $3.0 million due at the maturity date of June 30, 2020. In May 2020, the Company repaid the remaining outstanding balance of $5.9 million with the proceeds received through the 2020 Credit Agreement discussed below.

Term Loan Due to Former Non-Controlling Interest Holder

In June 2018, the Company acquired the outstanding member interests of an entity controlled by the Company for $8.1 million. The Company financed this acquisition by entering into a term loan agreement with the noncontrolling member bearing fixed interest of 4.5% per quarter (18.0% per annum) on the outstanding principal balance. The loan required fixed quarterly payments throughout the term of the loan, which was scheduled to be paid in full by April 1, 2026.

In May 2020, the Company amended the term loan and, using the proceeds from the 2020 Credit Agreement discussed below, prepaid $1.5 million of principal and interest on the note, of which $1.0 million was towards the outstanding principal balance, thereby reducing the fixed quarterly payment due to the lender. In relation to this amendment, the Company was required to issue warrants for 400,000 shares of common stock resulting in a discount to the term loan of $0.2 million. As of December 31, 2020, the outstanding balance was $5.8 million. In April 2021, the Company repaid the remaining outstanding balance of this facility with the proceeds received from the Merger. Upon prepayment of this facility, the Company incurred $2.6 million in prepayment penalties that were recorded to loss on extinguishment of debt in the Company’s statement of operations. The facility was terminated after the repayment in April 2021.

2020 Credit Agreement

In May 2020, the Company entered into a credit agreement (“2020 Credit Agreement”) with a new lender that provided the Company with proceeds of $25.0 million to provide the Company with access to working capital towards the purchase of energy storage system equipment. The 2020 Credit Agreement has a maturity date of the earlier of (1) May 2021, (2) the maturity date of the revolving loan agreement, or (3) the maturity date of the convertible promissory notes discussed below. The loan bore interest of 12% per annum, of which 8% was paid in cash and 4% added back to principal of the loan balance every quarter. The Company used a portion of the proceeds towards payments associated with existing debt as previously discussed. As of December 31, 2020, the outstanding balance was $25.6 million. In April 2021, the Company repaid the remaining outstanding balance of this facility with the proceeds received from the Merger. Upon prepayment of this facility, the Company incurred $1.4 million in prepayment penalties that were recorded to loss on extinguishment of debt in the Company’s statement of operations. The facility was terminated after the repayment in April 2021.

2021 Credit Agreement

In January 2021, the Company, through a wholly owned Canadian entity, entered into a credit agreement to provide a total of $2.7 million towards the financing of certain energy storage systems. The credit agreement is structured on a non-recourse basis and the system will be operated by the Company. The credit agreement has a stated interest of 5.45% and a maturity date of June 2031. The Company received an advance under the credit agreement of $1.8 million in January 2021. The repayment of advances received under this credit agreement is determined by the lender based on the proceeds generated by the Company through the operation of the underlying energy storage systems. As of June 30, 2021, and December 31, 2020, the outstanding balance was $1.8 million and zero, respectively. The Company was in compliance with all covenants associated with the 2021 Credit Agreement as of June 30, 2021.

19

STEM, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

The Company’s outstanding debt consisted of the following as of June 30, 2021 (in thousands):

	6/30/2021
Outstanding principal	$	1,951
Unamortized discount	(232)
Carrying value of debt	$	1,719

7.CONVERTIBLE PROMISSORY NOTES

As of December 31, 2020, the Company had various convertible notes outstanding to investors. The Company refers to the collective group of all such note instruments as the “Convertible Promissory Notes”. As of December 31, 2020, these Convertible Promissory Notes had a balance of $67.6 million. During the six months ended June 30, 2021, the Company issued additional Convertible Promissory Notes. The details of the convertible notes issued are set forth below. As of June 30, 2021, there were no Convertible Promissory Notes outstanding due to their conversion and cancellation upon the Merger.

Q1 2021 Convertible Notes

In January 2021, the Company issued and sold convertible promissory notes (the “Q1 2021 Convertible Notes”) under the same terms as the existing Convertible Promissory Notes to various investors with aggregate gross proceeds of $1.1 million. The Company evaluated the conversion option within the Q1 2021 Convertible Notes and determined the effective conversion price was beneficial to the note holders. As such, the Company recorded a beneficial conversion feature (“BCF”) related to the issuance of the Q1 2021 Convertible Notes based on the difference between the effective conversion rate and the fair value of the stock into which it was convertible, limited by the amount of the aggregate gross proceeds. The BCF resulted in a $1.1 million discount to the Q1 2021 Convertible Notes with an increase to additional paid in capital. The Company accreted the discount in connection with the BCF as interest expense over the term of the Q1 2021 Convertible Notes using the effective interest rate method.

Conversion and Cancellation of Convertible Promissory Notes Upon Merger

Immediately prior to the effectiveness of the Merger, the entire balance of the Company’s outstanding Convertible Promissory Notes issued by Legacy Stem automatically converted into shares of Legacy Stem Common Stock. Upon the effectiveness of the Merger, these shares of Legacy Stem Common Stock automatically converted into 10,921,548 shares of Class A common stock of Stem. The balance associated with the outstanding Convertible Promissory Notes totaling $77.7 million, including $7.7 million of interest accrued on the notes through the date of Merger, was reclassified to additional paid-in-capital. The unamortized portion of the debt discount associated with the outstanding Q1 2021 Convertible Notes totaling $1.1 million was fully expensed to loss on extinguishment of debt on the Company’s statement of operations.

8.WARRANTS

Legacy Stem Warrants

Since inception the Company has issued warrants to purchase shares of Legacy Stem’s preferred stock in conjunction with various debt financings. See Note 4 for further information regarding fair value measurements associated with the resulting warrant liabilities, which are remeasured on a recurring basis each period. The Company has also issued warrants to purchase shares of Legacy Stem’s common stock. Upon effectiveness of the Merger, the Company had 50,207,439 warrants outstanding, of which substantially all were converted into 2,759,970 shares of Class A common stock of Stem. Upon conversion of the warrants, the existing warrant liabilities were remeasured to fair value resulting in a gain on remeasurement of $100.9 million and a total warrant liability of $60.6 million, which was then reclassified to additional paid-in-capital. As of June 30, 2021, there were 23,634 Legacy Stem Warrants that remain outstanding. These instruments are exercisable into the Company’s Class A common stock and are equity classified.

20

STEM, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

Public Warrants and Private Placement Warrants

As part of STPK’s initial public offering on August 20, 2020, prior to the effectiveness of the Merger, STPK issued 12,786,168 warrants each of which entitles the holder to purchase one share of Class A common stock at an exercise price of $11.50 per share (the “Public Warrants”). Simultaneously with the closing of the IPO, STPK completed the private sale of 7,181,134 million warrants to STPK’s sponsor (the “Private Warrants”). Upon issuance, these warrants met the criteria for liability classification. Upon the effectiveness of the Merger, Stem assumed the outstanding Public Warrants and Private Warrants, which continued to meet the criteria for liability classification, resulting in assumed warrant liabilities of $185.9 million and $118.4 million, respectively, or a total warrant liability of $304.3 million.

On June 25, 2021, the Company entered into an exchange agreement (the “Exchange Agreement”) with the holders of the 7,181,134 outstanding Private Placement Warrants, pursuant to which such holders received 4,683,349 shares of the Company’s common stock on June 30, 2021, in exchange for the cancellation of the outstanding Private Placement Warrants. Immediately prior to the exchange, the Private Warrants were marked to fair value, resulting in a loss of $52.0 million. As a result of the Exchange Agreement, there were no Private Warrants outstanding as of June 30, 2021.

Warrants Issued for Services

On April 7, 2021, the Company entered into a strategic relationship with an existing shareholder not deemed to be a related party to jointly explore on a non-exclusive basis possible business opportunities to advance projects in the United States, United Kingdom, Europe and Asia. As consideration for the strategic relationship, upon closing of the Merger, the Company issued warrants to purchase 350,000 shares of the Company’s common stock at an exercise price of $0.01 per share. These warrants were deemed to have been fully earned as of the grant date. The warrants were valued at fair market value as of the grant date totaling $9.2 million and recorded to general and administrative expense in the Company’s statement of operations. In May 2021, these warrants were exercised for shares of the Company’s common stock.

9.COMMON STOCK

The Company had reserved shares of common stock for issuance as follows:

	June 30, 2021
Shares reserved for warrants	12,809,802
Options issued and outstanding	10,357,133
Shares available for future issuance under equity incentive plan	23,016,754
Total	46,183,689

10.STOCK-BASED COMPENSATION

Under the Company’s 2009 Equity Incentive Plan (the “2009 Plan”), incentive stock options (ISOs), nonqualified stock options (NSOs), stock bonuses, and rights to acquire restricted stock are available for grant to employees, directors and consultants. At June 30, 2021, 9,647,780 stock options outstanding under the 2009 Plan and zero shares were available for future grant. In May 2021, the Company issued stock options under the Stem Inc 2021 Equity Incentive Plan (the “2021 Plan”), with 23,722,254 shares reserved thereunder.

Under both the 2009 Plan and the 2021 Plan (collectively, the “Plans”), the exercise price of an option cannot be less than 100% of the fair value of one share of common stock for incentive or non-qualified stock options, and not less than 110% of the fair value for stockholders owning greater than 10% of all classes of stock, as determined by the Company’s Board of Directors (the “Board”). Options under the Plans generally expire after 10 years. Under the Plans, the Compensation Committee of the Board determines when the options granted will become exercisable. Options granted under the Plans generally vest 1/4 one year from the grant date and then 1/48 each month over the following three years and are exercisable for 10 years from the date of the grant. The Plans allow for exercise of unvested options with repurchase rights over the restricted common stock issued at the original exercise price. The repurchase rights lapse at the same rate as the options vest.

21

STEM, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

A summary of activity under the Plans is as follows:

	Number of Options Outstanding	Weighted- Average Exercise Price Per Share		Weighted- Average Remaining Contractual Life (years)	Aggregate Intrinsic Value (in thousands)
Balances as of December 31, 2020	51,379,939	$	0.56	7.2	$	46,516
Retroactive application of recapitalization	(40,314,281)	2.05		—	—
Adjusted Balance as of December 31, 2020	11,065,658	2.61		7.2	46,516
Options granted	709,448	25.53
Options exercised	(1,402,538)	1.97
Options forfeited	(15,435)	2.25
Balances as of June 30, 2021	10,357,133	$	4.27	7.0	$	328,644
Options vested and exercisable — June 30, 2021	7,273,421	$	2.15	6.2	$	247,154

The weighted-average grant date fair value of stock options granted to employees was $16.84 during the six months ended June 30, 2021. There were 2,354,515 stock options granted during the six months ended June 30, 2020. The intrinsic value of options exercised was $47.6 million and less than $0.1 million during the six months ended June 30, 2021 and 2020, respectively.

Stock-Based Compensation

The following table summarizes stock-based compensation expense recorded in each component of operating expenses in the Company’s consolidated statements of operations and comprehensive loss (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
Sales and marketing	$	168	$	150	$	252	$	220
Research and development	264		301		419		486
General and administrative	592		25		1,113		226
Total stock-based compensation expense	$	1,024	$	476	$	1,784	$	932

As of June 30, 2021, the Company had approximately $17.9 million of remaining unrecognized stock-based compensation expense, which is expected to be recognized over a weighted average period of 3.6 years.

11.NET LOSS PER SHARE

The following table sets forth the computation of basic and diluted net loss per share attributable to common stockholders (in thousands, except share and per share amounts):

	Three Months Ended June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
Numerator:
Net loss attributable to common stockholders	$	(100,216)	$	(18,981)	$	(182,769)	$	(36,452)
Less: Deemed dividend	—		—		—		(9,484)
	$	(100,216)	$	(18,981)	$	(182,769)	$	(45,936)
Denominator:
Weighted-average number of shares outstanding used to compute net loss per share attributable to common stockholders, basic and diluted	100,611,965		39,801,379		70,684,750		40,209,877
Net loss per share attributable to common stockholders, basic and diluted	$	(1.00)	$	(0.48)	$	(2.59)	$	(1.14)

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STEM, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

The following potentially dilutive shares were not included in the calculation of diluted shares outstanding for the periods presented as the effect would have been anti-dilutive:

	June 30, 2021	June 30, 2020
Convertible promissory notes	—	7,473,946
Outstanding stock options	10,357,133	9,585,364
Outstanding warrants	12,809,802	9,842,181
Total	23,166,935	26,901,491

12.INCOME TAXES

The Company did not record a provision or benefit for income taxes during the six months ended June 30, 2021 and 2020. The Company continues to maintain a full valuation allowance for its net U.S. federal and state deferred tax assets.

13.COMMITMENTS AND CONTINGENCIES

Contingencies

The Company is party to various legal proceedings from time to time. A liability is accrued when a loss is both probable and can be reasonably estimated. Management believes that the probability of a material loss with respect to any currently pending legal proceeding is remote. However, litigation is inherently uncertain and it is not possible to definitively predict the ultimate disposition of any of these proceedings. The Company believes there is no current litigation pending or loss contingencies that could have, either individually or in the aggregate, a material adverse impact on the Company’s consolidated financial statements.

Commitments

In June 2021, the Company entered into a lease agreement for office space in San Francisco, California. The lease has a term of approximately 7.7 years and is expected to commence in the third quarter of 2021. Total lease payments are estimated to be $15.2 million over the lease term.

14.SUBSEQUENT EVENTS

Management has evaluated subsequent events through August 11, 2021, the date the condensed consolidated financial statements were available for issuance, and has determined that there are no subsequent events that require disclosure.

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ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

You should read the following management’s discussion and analysis of our financial condition and results of operations together with our unaudited condensed consolidated financial statements and related notes included under Part I, Item 1 of this Quarterly Report on Form 10-Q. This discussion and analysis should also be read together with our audited consolidated financial statements as of December 31, 2020 and 2019 and for the years ended December 31, 2020 and 2019 (“Annual Financial Statements”) and the section entitled “Stem’s Management’s Discussion and Analysis of Financial Condition and Results or Operations” contained in our Form S-1 filed with the SEC on July 19, 2021.You should carefully read the sections entitled “Special Note Regarding Forward-Looking Statements” and “Risk Factors” to gain an understanding of the important factors that could cause actual results to differ materially from our forward-looking statements. Throughout this section, unless otherwise noted “we”, “us”, “our” and the “Company” refer to Stem and its consolidated subsidiaries.

Star Peak Acquisition Corp. Merger

On April 28, 2021, Star Peak Energy Transition Corp. (“STPK”), an entity listed on the New York Stock Exchange under the trade symbol “STPK”, acquired Stem, Inc. (“Legacy Stem”), by the merger of STPK Merger Sub Corp., a Delaware corporation and wholly-owned subsidiary of STPK (“Merger Sub”), with and into Legacy Stem, with Legacy Stem continuing as the surviving entity and a wholly-owned subsidiary of STPK (the “Merger”). The public company resulting from the Merger was renamed Stem, Inc., which we refer to as “Stem”, “we”, “us”, “our”, or the Company, and is listed on the New York Stock Exchange under the trade symbol “STEM”. Upon the consummation of the Merger, Stem received approximately $550.3 million, net of fees and expenses. See Note 1 in the accompanying condensed consolidated financial statements for additional details regarding this transaction. For financial reporting purposes, Legacy Stem is treated as the accounting acquirer.

Overview

Our mission is to build and operate the largest, digitally connected, intelligent energy storage network for our customers. In order to fulfill our mission, (i) we provide our customers, which include commercial and industrial (“C&I”) enterprises as well as independent power producers, renewable project developers, utilities and grid operators, with an energy storage system, sourced from leading, global battery original equipment manufacturers (“OEMs”), that we deliver through our partners, including solar project developers and engineering, procurement and construction firms and (ii) through our Athena artificial intelligence (“AI”) platform (“Athena”), we provide our customers with on-going software-enabled services to operate the energy storage systems for 10 to 20 years. In addition, in all the markets where we operate our customers’ systems, we have agreements to manage the energy storage systems using the Athena platform to participate in energy markets and to share the revenue from such market participation.

We operate in two key areas within the energy storage landscape: Behind-the-Meter (“BTM”) and Front-of-the-Meter (“FTM”). An energy system’s position in relation to a customer’s electric meter determines whether it is designated a BTM or FTM system. BTM systems provide power that can be used on-site without interacting with the electric grid and passing through an electric meter. Our BTM systems reduce C&I customer energy bills and help our customers facilitate the achievement of their corporate environmental, social, and corporate governance (“ESG”) objectives. FTM, grid-connected systems provide power to off-site locations and must pass through an electric meter prior to reaching an end-user. Our FTM systems decrease risk for project developers, lead asset professionals, independent power producers and investors by adapting to dynamic energy market conditions in connection with the deployment of electricity and improving the value of energy storage over the course of their FTM system’s lifetime.

Since our inception in 2009, we have engaged in developing and marketing Athena’s software enabled services, raising capital, and recruiting personnel. We have incurred net operating losses and negative cash flows from operations each year since our inception. We have financed our operations primarily through the issuance of convertible preferred stock, debt financing, and cash flows from customers.

Our total revenue grew from $4.4 million for the three months ended June 30, 2020 to $19.3 million for the three months ended June 30, 2021. For the three months ended June 30, 2021 and 2020, we incurred net losses of $100.2 million and $19.0 million, respectively. Our total revenue grew from $8.5 million for the six months ended June 30, 2020 to $34.8 million for the six months ended June 30, 2021. For the six months ended June 30, 2021 and 2020, we incurred net losses of $182.8 million and $36.5 million, respectively. As of June 30, 2021, we had an accumulated deficit of $590.6 million.

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We expect that our sales and marketing, research and development, regulatory and other expenses will continue to increase as we expand our marketing efforts to increase sales of our solutions, expand existing relationships with our customers, and obtain regulatory clearances or approvals for future product enhancements. In addition, we expect our general and administrative costs and expenses to increase due to the additional costs associated with scaling our business operations as well as being a public company, including legal, accounting, insurance, exchange listing and SEC compliance, investor relations and other costs and expenses.

Some Key Factors, Trends and Risks Affecting our Business

We believe that our performance and future success depend on several factors that present significant opportunities for us but also pose risks and challenges, including but not limited to:

Decline in Lithium-Ion Battery Costs

Our revenue growth is directly tied to the continued adoption of energy storage systems by our customers. The cost of lithium ion energy storage hardware has declined significantly in the last decade and has resulted in a large addressable market today. The market for energy storage is rapidly evolving, and while we believe costs will continue to decline, there is no guarantee. If costs do not continue to decline, or do not decline as quickly as we anticipate, this could adversely affect our ability to increase our revenue and grow our business.

Increase in Deployment of Renewables

Deployment of intermittent resources has accelerated over the last decade, and today, wind and solar have become a low cost fuel source. We expect the cost of generating renewable energy to continue to decline and deployments of energy storage systems to increase. As renewable energy sources of energy production are expected to represent a larger proportion of energy generation, grid instability rises due to their intermittency, which can be addressed by energy storage solutions.

Competition

We are currently a market leader in terms of capacity of energy storage under management. We intend to expand our market share over time by leveraging the network effect of Athena’s AI infrastructure. Existing competitors may expand their product offerings and sales strategies, and new competitors may enter the market. Furthermore, our competitors include other types of software providers and some hardware manufacturers that offer software solutions. If our market share declines due to increased competition, our revenue and ability to generate profits in the future may be adversely affected.

Government Regulation and Compliance

Although we are not regulated as a utility, the market for our product and services is heavily influenced by federal, state, and local government statutes and regulations concerning electricity. These statutes and regulations affect electricity pricing, net metering, incentives, taxation, competition with utilities, and the interconnection of customer-owned electricity generation. In the United States and internationally, governments continuously modify these statutes and regulations and acting through state utility or public service commissions, regularly change and adopt different rates for commercial customers. These changes can positively or negatively affect our ability to deliver cost savings to customers.

Impact of COVID-19

In March 2020, the World Health Organization declared the outbreak of the novel coronavirus disease (“COVID-19”) as a pandemic, adversely impacting global commercial activity and greatly disrupting supply chains and the manufacturing, delivery and installation of energy storage systems worldwide. As a result, we adjusted certain aspects of our operations to protect our employees and customers while still meeting customers’ needs for vital technology. Government and business responses to COVID-19, along with the rise of the COVID-19 Delta variant and resurgence of related disruptions, could have a continued material adverse impact on economic and market conditions and trigger a period of continued global economic slowdown. The continued uncertainty and fluidity of this situation precludes any predication as to the extent and duration of the economic impact of COVID-19. Government and business responses to COVID-19 and the Delta variant therefore present material uncertainty and risk with respect to the Company and its performance and could materially and adversely affect our business, financial condition, and results of operations.

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In particular, we cannot predict the full impact the pandemic will have on the demand for our services, our sales cycles or installation timelines, the collections of accounts receivable, or spending by new customers. Furthermore, we cannot predict whether the pandemic will cause further customers to go out of business or continue to limit the ability of our direct sales force to travel to existing or potential customers, all of which could adversely affect our business, financial condition and results of operations. In addition, if supply chains become significantly disrupted due to additional outbreaks of the COVID-19 virus and the Delta variant or otherwise, or government and business responses including implementation of stringent health and safety guidelines, our ability to install and service energy systems could become adversely impacted.

Non-GAAP Financial Measures

In addition to our results determined in accordance with GAAP, we use Adjusted EBITDA and non-GAAP gross margin, which are non-GAAP financial measures, for financial and operational decision making and as a means to evaluate our operating performance and future prospects, develop internal budgets and financial goals, and to facilitate period-to-period comparisons. Our management believes that these non-GAAP financial measures provide meaningful supplemental information regarding our performance and liquidity by excluding certain expenses and expenditures that may not be indicative of our operating performance, such as stock-based compensation and other non-cash charges, as well as discrete cash charges that are infrequent in nature. We believe that both management and investors benefit from referring to these non-GAAP financial measures in assessing our performance and when planning, forecasting, and analyzing future periods. These non-GAAP financial measures also facilitate management’s internal comparisons to our historical performance and liquidity as well as comparisons to our competitors’ operating results. We believe these non-GAAP financial measures are useful to investors both because they (1) allow for greater transparency with respect to key metrics used by management in its financial and operational decision making and (2) are used by our institutional investors and the analyst community to help them analyze the health of our business.

Non-GAAP gross margin

We define non-GAAP gross margin as gross margin excluding amortization of capitalized software, impairments related to decommissioning of end-of-life systems, and certain operating expenses including communication and cloud services expenditures reclassified to cost of revenue.

The following table provides a reconciliation of gross margin (GAAP) to non-GAAP gross margin ($ in millions):

	Three Months Ended June 30,
	2021			2020
Revenue	$	19.3		$	4.4
Cost of revenue	(19.4)			(6.1)
Gross Margin (GAAP)	(0.1)			(1.7)
Gross Margin % (GAAP)	(1)		%	(40)		%
Adjustments to Gross Margin:
Amortization of Capitalized Software	1.3			0.9
Impairments	0.3			1.1
Other Adjustments (1)	0.6			(0.1)
Non-GAAP Gross Margin	$	2.1		$	0.2
Non-GAAP Gross Margin %	11		%	5		%
(1) Consists of certain operating expenses classified to cost of revenue for accounting purposes.

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Adjusted EBITDA

We believe that Adjusted EBITDA is useful for investors to use in comparing our financial performance with the performance of other companies for the following reasons:

● Adjusted EBITDA is widely used by investors and securities analysts to measure a company’s operating performance without regard to items such as stock-based compensation expense, depreciation and interest expense, which can vary substantially from company to company depending upon their financing and capital structures, and the method by which assets were acquired; and

● Adjusted EBITDA provides consistency and comparability with our past financial performance, and facilitates comparisons with other companies, many of which use similar non-GAAP financial measures to supplement their GAAP results.

Our use of Adjusted EBITDA has limitations as an analytical tool, and you should not consider this measure in isolation or as a substitute for analysis of our financial results as reported under GAAP. Some of these limitations are as follows:

● Although depreciation expense is a non-cash charge, the assets being depreciated may have to be replaced in the future. Adjusted EBITDA does not reflect cash capital expenditure requirements for such replacements or for new capital expenditure requirements;

● Adjusted EBITDA excludes stock-based compensation expense, which has been, and will continue to be for the foreseeable future, a significant recurring expense for our business and an important part of our compensation strategy;

● Adjusted EBITDA does not reflect: (1) changes in, or cash requirements for, our working capital needs; (2) interest expense, or the cash requirements necessary to service interest or principal payments on our debt, which reduces cash available to us; or (3) tax payments that may represent a reduction in cash available to us; and

● The expenses and other items that we exclude in our calculation of Adjusted EBITDA may differ from the expenses and other items, if any, that other companies may exclude from Adjusted EBITDA when they report their operating results.

Because of these limitations, Adjusted EBITDA should be considered along with other operating and financial performance measures presented in accordance with GAAP.

We define Adjusted EBITDA as net loss before depreciation and amortization, including amortization of internally developed software, net interest expense, further adjusted to exclude stock-based compensation and other income and expense items, including the change in fair value of warrants and embedded derivatives, vesting of warrants and loss on extinguishment of debt.

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The following table provides a reconciliation of net loss to Adjusted EBITDA:

	Three Months Ended June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
	(in thousands)				(in thousands)
Net loss	$	(100,216)	$	(18,981)	$	(182,769)	$	(36,452)
Adjusted to exclude the following:
Depreciation and amortization	5,236		3,924		10,315		7,918
Interest expense	3,929		5,192		10,162		9,561
Loss on extinguishment of debt	5,064		—		5,064		—
Stock-based compensation	1,024		476		1,784		932
Vesting of warrants	9,184		—		9,184		—
Change in fair value of warrants and embedded derivative	67,179		1,918		133,577		909
Provision for income taxes	—		—		—		—
Adjusted EBITDA	$	(8,600)	$	(7,471)	$	(12,683)	$	(17,132)

Key Metrics

The following table presents our key metrics:

	Three Months Ended June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
	(in thousands)				(in thousands)
Key Financial Metrics:
Revenue	$	19,337	$	4,379	$	34,758	$	8,489
Gross Margin (GAAP)	(127)		$	(1,745)	$	(243)	$	(3,131)
Non-GAAP Gross Margin	2,118		$	150	$	5,054	$	297
Net loss	(100,216)		$	(18,981)	$	(182,769)	$	(36,452)
Adjusted EBITDA	(8,600)		$	(7,471)	$	(12,683)	$	(17,132)
Key Operating Metrics:
12-Month Pipeline (in billions)	$	1.7	**		*		**
Bookings (in millions)	45.1		37.9		95.9		57.7
Contracted Backlog (in millioms)	249.7		**		*		**
Contracted AUM (in millions)	1.2		0.5		*		**
* at period end
** not available

Bookings

Due to the long-term nature of our contracts, bookings are a key metric that allows us to understand and evaluate the growth of our Company and our estimated future revenue related to customer contracts for our energy optimization services and transfer of energy storage systems. Bookings represents the accumulated value at a point in time of contracts that have been executed under both our host customer and partnership sales models.

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For host customer sales, bookings represent the expected consideration from energy optimization services contracts, including estimated incentive payments that are earned by the host customer from utility companies in relation to the services provided by us and assigned by the host customer to us. For host customer sales, there are no differences between bookings and remaining performance obligations at any point in time.

For partnership sales, bookings are the sum of the expected consideration to be received from the transfer of hardware and energy optimization services (excluding any potential revenues from market participation). For partnership sales, even though we have secured an executed contract with estimated timing of project delivery and installation from the customer, we do not consider it a contract in accordance with ASC 606 or a remaining performance obligation until the customer has placed a binding purchase order. A signed customer contract is considered a booking as this indicates the customer has agreed to place a purchase order in the foreseeable future, which typically occurs within three (3) months of contract execution. However, executed customer contracts, without binding purchase orders, are cancellable without penalty by either party.

For partnership sales, once a purchase order has been executed, the booking is considered to be a contract in accordance with ASC 606, and therefore, gives rise to a remaining performance obligation as we have an obligation to transfer hardware and energy optimization services in our partnership agreements. We also have the contractual right to receive consideration for our performance obligations.

The accounting policy and timing of revenue recognition for host customer contracts and partnership arrangements that qualify as contracts with customers under ASC 606, are described within Note 3 of the notes to our annual Financial Statements.

Adjusted EBITDA

We calculate Adjusted EBITDA as net loss before net interest expense, income tax provision and depreciation and amortization, including amortization of internally developed software, further adjusted to exclude stock-based compensation and other income and expense items, including the change in fair value of warrants and embedded derivatives, vesting of warrants and loss on extinguishment of debt. See description of Adjusted EBITDA in Non-GAAP Financial Measures above.

Components of Our Results of Operations

Revenue

We generate service revenue and hardware revenue. Service revenue is generated through arrangements with host customers to provide energy optimization services using our proprietary cloud-based software platform coupled with a dedicated energy storage system owned and controlled by us throughout the term of the contract. Fees charged to customers for energy optimization services generally consist of recurring fixed monthly payments throughout the term of the contract and in some arrangements, an installation and/or upfront fee component. We may also receive incentives from utility companies in relation to the sale of our services.

We generate hardware revenue through partnership arrangements consisting of promises to sell an energy storage system to a solar plus storage project developers. Performance obligations are satisfied when the energy storage system along with all ancillary hardware components are delivered. The milestone payments received before the delivery of hardware is treated as deferred revenue. We separately generate services revenue through partnership arrangements by providing energy optimization services after the developer completes the installation of the project.

Cost of Revenue

Cost of hardware revenue includes the cost of the hardware, which generally includes the cost of the hardware purchased from a manufacturer, shipping, delivery, and other costs required to fulfill our obligation to deliver the energy storage system to the customer location. Cost of revenue may also include any impairment of energy storage systems held in our inventory for sale to our customer. Cost of hardware revenue related to the sale of energy storage systems is recognized when the delivery of the product is completed.

Cost of service revenue includes depreciation of the cost of energy storage systems we own under long-term customer contracts, which includes capitalized fulfillment costs, such as installation services, permitting and other related costs. Cost of revenue may also include any impairment of inventory and energy storage systems, along with system maintenance costs associated with the ongoing services provided to customers. Costs of revenue are recognized as energy optimization and other supporting services are provided to our customers throughout the term of the contract.

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Gross Margin

Our gross margin fluctuates significantly from quarter to quarter. Gross margin, calculated as revenue less costs of revenue, has been, and will continue to be, affected by various factors, including fluctuations in the amount and mix of revenue and the amount and timing of investments to expand our customer base. We hope to increase both our gross margin in absolute dollars and as a percentage of revenue through enhanced operational efficiency and economies of scale.

Operating Expenses

Sales and Marketing

Sales and marketing expense consists of payroll and other related personnel costs, including salaries, stock-based compensation, employee benefits, and travel for our sales and marketing personnel. In addition, sales and marketing expense includes trade show costs, amortization of intangibles and others expenses. We expect to increase selling and marketing expense to support the overall growth in our business.

Research and development

Research and development expense consists primarily of payroll and other related personnel costs for engineers and third parties engaged in the design and development of products, third-party software and technologies, including salaries, bonus and stock-based compensation expense, project material costs, services and depreciation. We expect research and development expense to increase in future periods to support our growth, including continuing to invest in optimization, accuracy and reliability of our platform and other technology improvements to support and drive efficiency in our operations. These expenses may vary from period to period as a percentage of revenue, depending primarily upon when we choose to make more significant investments.

General and Administrative Expense

General and administrative expense consists of payroll and other related personnel costs, including salaries, stock-based compensation, employee benefits and expenses for executive management, legal, finance and other costs. In addition, general and administrative expense includes fees for professional services and occupancy costs. We expect our general and administrative expense to increase as we scale up headcount with the growth of our business, and as a result of operating as a public company, including compliance with the rules and regulations of the SEC, legal, audit, additional insurance expenses, investor relations activities, and other administrative and professional services.

Other Income (Expense), Net

Interest Expense

Interest expense consists primarily of interest on our outstanding borrowings under our outstanding notes payable, convertible promissory notes, and financing obligations and accretion on our asset retirement obligations.

Loss on Extinguishment of Debt

Loss on extinguishment of debt consists of penalties incurred in relation to the prepayment of our outstanding borrowings under our outstanding notes payable and the write-off of any unamortized debt issuance costs associated with such notes.

Change in Fair Value of Warrants and Embedded Derivatives

Change in fair value of warrants and embedded derivatives is related to the revaluation of our outstanding convertible preferred stock warrant liabilities and embedded derivatives related to the redemption features associated with our convertible notes at each reporting date.

Other Expenses, Net

Other expenses, net consists primarily of income from equity investments and foreign exchange gains or losses.

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Results of Operations for the Three Months Ended June 30, 2021 and 2020

	Three Months Ended June 30,				$ Change		% Change
	2021		2020
	(In thousands, except percentage)
Revenue
Service revenue	$	5,153	$	3,670	$	1,483	40%
Hardware revenue	14,184		709		13,475		*
Total revenue	19,337		4,379		14,958		342%
Cost of revenue
Cost of service revenue	5,809		5,510		299		5%
Cost of hardware revenue	13,655		614		13,041		*
Total cost of revenue	19,464		6,124		13,340		218%
Gross margin	(127)		(1,745)		1,618		(93)%
Operating expenses:
Sales and marketing	3,913		4,242		(329)		(8)%
Research and development	4,827		3,619		1,208		33%
General and administrative	15,014		2,404		12,610		525%
Total operating expenses	23,754		10,265		13,489		131%
Loss from operations	(23,881)		(12,010)		(11,871)		99%
Other income (expense), net:
Interest expense	(3,929)		(5,192)		1,263		(24)%
Loss on extinguishment of debt	(5,064)		—		(5,064)		*
Change in fair value of warrants and embedded derivative	(67,179)		(1,918)		(65,261)		*
Other expenses, net	(163)		139		(302)		(217)%
Total other income (expense)	(76,335)		(6,971)		(69,364)		*
Loss before income taxes	(100,216)		(18,981)		(81,235)		428%
Income tax expense	—		—		—		—%
Net loss	$	(100,216)	$	(18,981)	$	(81,235)	428%

*Not meaningful

Revenue

Revenue increased by $15.0 million, or 342%, for the three months ended June 30, 2021, as compared to the three months ended June 30, 2020. The increase was primarily driven by a $13.5 million increase in hardware revenue due to increase in demand for systems related to FTM partnership agreements. Services revenue increased by $1.5 million primarily due to continued growth in host customers arrangements and partnership revenue related to services provided.

Cost of Revenue

Cost of revenue increased by $13.3 million, or 218%, for the three months ended June 30, 2021, as compared to the three months ended June 30, 2020. The increase was primarily driven by an increase of cost of hardware sales of $13.0 million in line with the increase in hardware revenue and an increase of $0.3 million in cost of service revenue associated with growth in service revenue.

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Operating Expenses

Sales and Marketing

Sales and marketing expense decreased by $0.3 million, or 8%, for the three months ended June 30, 2021, as compared to the three months ended June 30, 2020. The decrease was primarily due to lower marketing expense by $0.2 million compared to to 2020 during which educational material to sell, model and deploy energy storage systems was created, An increase in capitalized commissions in 2021 by $0.1 million due to higher volume of sales in 2021 added to the variance..

Research and Development

Research and development expense increased by $1.2 million, or 33%, for the three months ended June 30, 2021, as compared to the three months ended June 30, 2020. The increase was primarily due to higher personnel related costs as a result of higher headcount to support the growth of our operations.

General and Administrative

General and administrative expense increased by $12.6, or 525% for the three months ended June 30, 2021 compared to the three months ended June 30, 2020. The increase was primarily driven by an increase of $10.1 million in professional and legal services, an increase of $1.1 million in insurance and office related expenses, an increase of $0.9 million in personnel related costs due to increase in headcount and an increase of $0.5 million in stock-based compensation as a result of additional options to purchase our common stock granted to certain executives and other key employees.

Other Income (Expense), Net

Interest Expense

Interest expense increased by $1.3 million, or 24%, for the three months ended June 30, 2021 compared to the three months ended June 30, 2020. an The increase was partially offset by a decrease of $1.3 million in interest expense due to the repayment of notes payable in 2021.

Loss on Extinguishment of Debt

Loss on extinguishment of debt increased by $5.1 million for the three months ended June 30, 2021 compared to the three months ended June 30, 2020. The increase was driven by payment of a $4.0 million penalty on debt extinguishment and the write-off of $1.1 million of unamortized debt issuance costs upon the conversion of our Series D convertible notes in relation to the Merger.

Change in Fair Value of Warrants and Embedded Derivative

Change in fair value of warrants and embedded derivative increased by a $65.3 million for the three months ended June 30, 2021 compared to the three months ended June 30, 2020. This increase was due to the increase in the fair value of warrant liabilities in 2021.

Other Expenses, Net

Other expenses, net increased by $0.3 million, or 217%, for the three months ended June 30, 2021 compared to the three months ended June 30, 2020. The net increase was primarily driven by foreign exchange losses realized in the period related to operations in Canada.

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Results of Operations for the Six Months Ended June 30, 2021 and 2020

	Six Months Ended June 30,				$ Change		% Change
	2021		2020
	(In thousands, except percentage)
Revenue
Service revenue	$	10,035	$	7,062	$	2,973	42%
Hardware revenue	24,723		1,427		23,296		*
Total revenue	34,758		8,489		26,269		309%
Cost of revenue
Cost of service revenue	12,715		10,255		2,460		24%
Cost of hardware revenue	22,286		1,365		20,921		*
Total cost of revenue	35,001		11,620		23,381		201%
Gross margin	(243)		(3,131)		2,888		(92)%
Operating expenses:
Sales and marketing	6,580		8,646		(2,066)		(24)%
Research and development	9,234		7,032		2,202		31%
General and administrative	17,706		5,383		12,323		229%
Total operating expenses	33,520		21,061		12,459		59%
Loss from operations	(33,763)		(24,192)		(9,571)		40%
Other income (expense), net:
Interest expense	(10,162)		(9,561)		(601)		6%
Loss on extinguishment of debt	(5,064)		—		(5,064)		*
Change in fair value of warrants and embedded derivative	(133,577)		(909)		(132,668)		*
Other expenses, net	(203)		(1,790)		1,587		(89)%
Total other income (expense)	(149,006)		(12,260)		(136,746)		*
Loss before income taxes	(182,769)		(36,452)		(146,317)		401%
Income tax expense	—		—		—
Net loss	$	(182,769)	$	(36,452)	$	(146,317)	401%

*Not meaningful

Revenue

Revenue increased by $26.3 million, or 309%, for the six months ended June 30, 2021, as compared to the six months ended June 30, 2020. The increase was primarily driven by a $23.3 million increase in hardware revenue as our sales of standalone systems related to FTM partnership agreements continue to grow. Services revenue increased by $3.0 million primarily due to continued growth in host customers arrangements and partnership revenue related to services provided.

Cost of Revenue

Cost of revenue increased by $23.4 million, or 201%, for the six months ended June 30, 2021, as compared to the six months ended June 30, 2020. The increase was primarily driven by an increase of cost of hardware sales of $20.9 million in line with the increase in hardware revenue and an increase of $2.5 million in cost of service revenue associated with growth in service revenue.

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Operating Expenses

Sales and Marketing

Sales and marketing expense decreased by $2.1 million, or 24%, for the six months ended June 30, 2021, as compared to the six months ended June 30, 2020. The decrease was primarily due to a decrease of $0.8 million in personnel related costs as a result of turnover in the period, a decrease of $0.6 million in commission expenses as a result of a change in our commission plan structure, and a $0.2 million increase in capitalized commissions. Higher costs in marketing consulting expense by $0.5 million in 2020 compared to 2021.

Research and Development

Research and development expense increased by $2.2 million, or 31%, for the six months ended June 30, 2021, as compared to the six months ended June 30, 2020. The increase was primarily due to an increase of $3.6 million in personnel related costs as a result of increased headcount, which was partially offset by an increase of $1.4 million in capitalized software development costs.

General and Administrative

General and administrative expense increased by $12.3 million, or 229%, for the six months ended June 30, 2021, as compared to the six months ended June 30, 2020. The increase was primarily driven by $9.1 million of warrants issued for services in April 2021, an increase of $1.5 million in professional and legal services, an increase of $1.0 million in insurance related expenses, and an increase of $0.7 million in personnel-related costs due to higher headcount.

Other Income (Expense), Net

Interest Expense

Interest expense increased by $0.6 million, or 6%, for the six months ended June 30, 2021, as compared to the six months ended June 30, 2020. An increase of $0.6 million in interest expense mainly from the issuance of Series D convertible notes from October 2020 through January 2021.

Loss on Extinguishment of Debt

Loss on extinguishment of debt increased by $5.1 million for the six months ended June 30, 2021 compared to the six months ended June 30, 2020. The increase was driven by payment of a $4.0 million penalty on debt extinguishment and the write-off of $1.1 million of unamortized debt issuance costs upon the conversion of our Series D convertible notes in relation to the Merger.

Change in Fair Value of Warrants and Embedded Derivative

Change in fair value of warrants and embedded derivative increased by $132.7 million for the six months ended June 30, 2021, as compared to the six months ended June 30, 2020. This increase was due to the increase in the fair value of warrant liabilities in 2021.

Other Expenses, Net

Other expenses, net decreased by $1.6 million, or 89%, for the six months ended June 30, 2021, as compared to the six months ended June 30, 2020. The net decrease was primarily driven by $1.2 million in legal settlement and late fees incurred in the six months ended June 30, 2021 and a $0.4 million decrease in foreign exchange losses realized in the period related to operations in Canada.

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Liquidity and Capital Resources

Sources of liquidity

Liquidity describes the ability of a company to generate sufficient cash flows to meet the cash requirements of its business operations, including working capital needs, debt service, acquisitions, contractual obligations and other commitments. We assess liquidity in terms of our cash flows from operations and their sufficiency to fund our operating and investing activities. To meet our payment service obligations we must have sufficient liquid assets and be able to move funds on a timely basis.

As of June 30, 2021, our principal source of liquidity is cash generated from financing activities. Cash generated from financing activities through June 30, 2021 primarily includes proceeds from the Merger that provided us with approximately $550.3 million, net of fees and expenses, sales of convertible preferred stock, proceeds from convertible notes, and proceeds from our various borrowings. In connection with the Merger, the convertible notes and related accrued interest converted to equity and we paid in full all other outstanding debt except the 2021 Credit Agreement described below. We believe that our cash position is sufficient to meet our capital and liquidity requirements for at least the next 12 months after the date that the condensed consolidated financial statements are available to be issued and thereafter for the foreseeable future; therefore, there is not substantial doubt about the Company’s ability to continue as a going concern.

Our business prospects are subject to risks, expenses and uncertainties frequently encountered by companies in the early stages of commercial operations. The attainment of profitable operations is dependent upon future events, including obtaining adequate financing to complete our development activities, obtaining adequate supplier relationships, building our customer base, successfully executing our business and marketing strategy and hiring appropriate personnel. Failure to generate sufficient revenues, achieve planned gross margins and operating profitability, control operating costs, or secure additional funding may require us to modify, delay, or abandon some of our planned future expansion or development, or to otherwise enact operating cost reductions available to management, which could have a material adverse effect on our business, operating results, financial condition and ability to achieve our intended business objectives.

In the future, we may be required to obtain additional equity or debt financing in order to support our continued capital expenditures and operations. In the event that additional financing is required from outside sources, we may not be able to raise it on terms acceptable to us or at all. If we are unable to raise additional capital or generate cash flows necessary to expand our operations and invest in new technologies, this could reduce our ability to compete successfully and harm our business, growth and results of operations.

The Company’s long-term liquidity requirements primarily are linked to the continued extension of the Athena platform and the use of our balance sheet to improve the terms and conditions associated with the purchase of energy storage systems from our hardware vendors. While we have plans to potentially expand our geographical footprint beyond our current partnerships and enter into joint ventures, those are not required initiatives to achieve our plan.

In addition to the foregoing, based on our current assessment, we do not expect any material adverse effect on our long-term liquidity due to the COVID-19 pandemic or government responses thereto. However, we will continue to assess these effects to our operations. The extent to which the COVID-19 pandemic and government and business responses thereto will affect our business and operations will continue to depend on future developments that are highly uncertain and cannot be predicted with confidence, such as the ultimate geographic spread of the disease, the duration of the pandemic, any restrictions on the ability of hospitals and trial sites to conduct trials that are not designed to address the COVID-19 pandemic and the perceived effectiveness of actions taken in the United States and other countries to contain and treat the disease. While the potential economic impact brought by COVID-19 and government and business responses may be difficult to assess or predict, a widespread pandemic and government and business responses could result in significant disruption of global financial markets, reducing our ability to access capital in the future. In addition, a recession or long-term market correction resulting from the spread of COVID-19 or government and business responses could materially affect our business and the value of our common stock.

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Financing Obligations

We have entered into arrangements wherein we finance the cost of energy storage systems via special purpose entities (“SPE”) we establish with outside investors. These SPEs are not consolidated into our financial statements, but are accounted for as equity method investments. Through the SPEs, the investors provide us upfront payments. Under these arrangements, the payment by the SPE to us is accounted for as a borrowing by recording the proceeds received as a financing obligation. The financing obligation is repaid with the future customer payments and incentives received. A portion of the amounts paid to the SPE is allocated to interest expense using the effective interest rate method.

Furthermore, we continue to account for the revenues from customer arrangements and incentives and all associated costs despite such systems being legally sold to the SPEs due to our significant continuing involvement in the operations of the energy storage systems.

The total financing obligation as of June 30, 2021 was $89.8 million, of which $15.3 million was classified as a current liability.

Notes Payable

Revolving Loan Due to SPE Member

In April 2017, we entered into a revolving loan agreement with an affiliate of a member of certain SPEs in which we have an ownership interest. The purpose of this revolving loan agreement is to finance the Company’s purchase of hardware for its various energy storage system projects. We have amended the loan from time to time as our business has grown, and as of the beginning of 2020, the agreement had a total revolving loan capacity of $45.0 million that bore fixed interest at 10% with a maturity date of June 2020.

In May 2020, concurrent with the 2020 Credit Agreement discussed below, we amended the facility to reduce the loan capacity to $35.0 million and extend the maturity date to May 2021. The amendment increased the fixed interest rate for any borrowings outstanding more than nine (9) months to 14% thereafter.

Additionally, under the original terms of the revolving loan agreement, we were able to finance 100% of the value of the hardware purchased up to the total loan capacity. The amendment reduced the advance rate to 85%, with an additional reduction to 70% in August 2020. We had $9.6 million outstanding under this revolving loan agreement as of March 31, 2021. In April 2021, we repaid the remaining outstanding balance in full.

Term Loan Due to SPE Member

In December 2018, we entered into a term loan in the amount of $13.3 million with an affiliate of a member of certain SPEs in which we have an ownership interest. As of the beginning of 2020, this term loan bore fixed interest of 12.5% on the outstanding principal balance with a final balloon payment of $3.0 million due at the maturity date of June 30, 2020. In May 2020, we repaid the remaining outstanding balance of $5.9 million with the proceeds received through the 2020 Credit Agreement discussed below.

Term Loan Due to Former Non-Controlling Interest Holder

In June 2018, we acquired the outstanding member interests of an entity we controlled for $8.1 million. We financed this acquisition by entering into a term loan agreement with the noncontrolling member bearing fixed interest of 18% (4.5% quarterly) on the outstanding principal balance. This loan requires fixed quarterly payments throughout the term of the loan, which will be paid in full by April 1, 2026. In May 2020, we amended the term loan and, using the proceeds from the 2020 Credit Agreement discussed below, prepaid $1.5 million of principal and interest on the note, of which $1.0 million was towards the outstanding principal balance, thereby reducing the fixed quarterly payment due to the lender. In relation to this amendment, we were required to issue warrants for 400,000 shares of common stock resulting in a discount to the term loan of $0.2 million. Such debt discount is amortized to earnings through interest expense over the expected life of the debt. In April 2021, we repaid the remaining outstanding balance in full.

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2020 Credit Agreement

In May 2020, we entered into a credit agreement (“2020 Credit Agreement”) with a new lender that provided us with proceeds of $25.0 million that increased our access to working capital. The 2020 Credit Agreement has a maturity date of the earlier of (1) May 14, 2021, (2) the maturity date of the revolving loan agreement, or (3) the maturity date of the convertible promissory notes discussed below. The loan bears interest of 12% per annum, of which 8% is paid in cash and 4% is added back to principal of the loan balance every quarter. We used a portion of the proceeds towards payments associated with existing debt as previously discussed. In April 2021, we repaid the remaining outstanding balance in full.

2021 Credit Agreement

In January 2021, we entered into a non-recourse credit agreement to provide a total of $2.7 million towards the financing of certain energy storage systems that we own and operate. The credit agreement has a stated interest of 5.45% and a maturity date of June 2031. We received an advance under the credit agreement of $1.8 million in January 2021. The repayment of advances received under this credit agreement is determined by the lender based on the proceeds generated by us through the operation of the underlying energy storage systems. We have $1.8 million of outstanding borrowings under this credit agreement as of June 30, 2021.

Cash Flows

The following table summarizes our cash flows for the periods indicated (in thousands):

	Six Months Ended June 30,
	2021		2020
OPERATING ACTIVITIES:
Net cash used in operating activities	$	(41,833)	$	(16,497)
Net cash used in investing activities	(8,596)		(10,183)
Net cash provided by financing activities	517,187		22,061
Effect of exchange rate changed on cash	438		(176)
Net increase (decrease) in cash and cash equivalents	$	467,196	$	(4,795)

Operating Activities

During the six months ended June 30, 2021, net cash used in operating activities was $41.8 million, primarily resulting from our operating loss of $182.8 million, adjusted for non-cash charges of $163.7 million and net cash outflows of $22.8 million from changes in operating assets and liabilities. Non-cash charges primarily consisted of depreciation and amortization of $10.3 million, non-cash interest expense of $7.1 million, which includes interest expenses associated with debt issuance costs, stock-based compensation expense of $1.8 million, change in the fair value of warrant liability and embedded derivative of $133.6 million, impairment of energy storage systems of $1.3 million, and issuance of warrants for services of $9.2 million. The net cash inflow from changes in operating assets and liabilities was primarily driven by an increase in deferred revenue of $3.3 million and an increase in accounts payable and accrued expenses of $3.3 million, partially offset by an increase in inventory of $6.3 million, an increase in other assets of $16.9 million, an increase in accounts receivable of $4.2 million, and an increase in contract origination costs of $1.7 million.

During the six months ended June 30, 2020, net cash used in operating activities was $16.5 million, primarily resulting from our operating loss of $36.5 million, offset by non-cash charges of $15.8 million and net cash inflows of $4.2 million from changes in operating assets and liabilities. Non-cash charges primarily consisted of depreciation and amortization of $7.9 million, non-cash interest expense of $4.6 million, which includes interest expenses associated with debt issuance costs, stock-based compensation expense of $0.9 million, change in the fair value of warrant liability and embedded derivative of $0.9 million, and impairment of energy storage systems of $0.9 million. The net cash inflow from changes in operating assets and liabilities was primarily driven by an increase in deferred revenue of $12.3 million, an increase in accounts payable and accrued expenses of $0.4 million, and a decrease in accounts receivable of $2.2 million, partially offset by increase in inventory of $6.3 million, an increase in contract origination costs of $1.4 million, and an increase in other assets of $2.7 million.

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Investing Activities

During the six months ended June 30, 2021, net cash used for investing activities was $8.6 million, primarily consisting of $5.6 million in purchase of energy systems and $2.7 million in capital expenditures on internally-developed software.

During the six months ended June 30, 2020, net cash used for investing activities was $10.2 million, consisting of $7.6 million in purchase of energy systems and $2.6 million in capital expenditures on internally-developed software.

Financing Activities

During the six months ended June 30, 2021, net cash provided by financing activities was $517.2 million, primarily consisting of net proceeds from the Merger and PIPE financing of $550.3 million, proceeds from issuance of notes payable of $3.9 million, proceeds from financing obligations of $4.9 million, proceeds from exercise of stock options and warrants of $2.9 million, net proceeds from issuance of convertible promissory notes of $1.1 million, partially offset by repayment of notes payable and financing obligations of $41.4 million and $4.6 million, respectively.

During the six months ended June 30, 2020, net cash provided by financing activities was $22.1 million, primarily resulting from net proceeds from issuance of convertible notes of $14.1 million, net proceeds from issuance of notes payable of $23.5 million, proceeds from financing obligations of $8.4 million, partially offset by repayment of notes payable of $19.7 million and repayment of financing obligations of $4.3 million.

Contractual Obligations and Commitments

There have been no material changes to our contractual obligations described in our registration statement on Form S-1 as filed with the SEC on July 19, 2021.

Off-Balance Sheet Arrangements

We are not a party to any off-balance sheet arrangements, including guarantee contracts, retained or contingent interests, or unconsolidated variable interest entities that either have, or are reasonably likely to have, a current or future material effect on our consolidated financial statements.

Critical Accounting Policies and Estimates

A summary of our critical accounting policies and estimates is presented in our registration statement on Form S-1 filed with the SEC on July 19, 2021. Information with respect to changes in our critical accounting policies can be found in Note 2 of the Notes to the unaudited condensed consolidated financial statements in this report, which information is incorporated herein by reference..

Recent Accounting Pronouncements

Information with respect to recent accounting pronouncements may be found in Note 2 of the Notes to the unaudited condensed consolidated financial statements in this report, which information is incorporated herein by reference.

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Special Note Regarding Forward-Looking Statements

This second-quarter 2021 Form 10-Q, as well as other statements we make, contains “forward-looking statements” within the meaning of the federal securities laws, which include any statements that are not historical facts. Such statements often contain words such as “expect,” “may,” “can,” “believe,” “predict,” “plan,” “potential,” “projected,” “projections,” “forecast,” “estimate,” “intend,” “anticipate,” “ambition,” “goal,” “target,” “think,” “should,” “could,” “would,” “will,” “hope” “see,” “likely,” and other similar words.

Forward-looking statements address matters that are, to varying degrees, uncertain, such as statements about the reduction of greenhouse gas (“GHG”) emissions; the integration and optimization of energy resources; the business strategies of Stem and those of its customers; the global commitment to decarbonization; our ability to retain or upgrade current customers, further penetrate existing markets or expand into new markets; our ability to manage our supply chains and distribution channels and the impact of natural disasters and other events beyond our control, such as the COVID-19 pandemic and the Delta variant, and government and business responses thereto; and future results of operations. Such forward-looking statements are subject to risks, uncertainties, and other factors that could cause actual results to differ materially from those expressed or implied by such forward-looking statements. These forward-looking statements are based upon assumptions and estimates that, while considered reasonable by Stem and its management, depend upon inherently uncertain factors and risks that may cause actual results to differ materially from current expectations, including our inability to help reduce GHG emissions; our inability to seamlessly integrate and optimize energy resources; our inability to achieve our financial and performance targets and other forecasts and expectations; our inability to recognize the anticipated benefits of our recent business combination with Star Peak Energy Transition Corp. (“Star Peak”); our ability to grow and manage growth profitably; risks relating to the development and performance of our energy storage systems and software-enabled services; the risk that the global commitment to decarbonization may not materialize as we predict, or even if it does, that we might not be able to benefit therefrom; our inability to retain or upgrade current customers, further penetrate existing markets or expand into new markets; our inability to secure sufficient inventory from our suppliers to meet customer demand, and provide us with contracted quantities of equipment; supply chain interruptions and manufacturing or delivery delays; disruptions in sales, production, service or other business activities; our inability to attract and retain qualified personnel; the risk that our business, financial condition and results of operations may be adversely affected by other political, economic, business and competitive factors; and other risks and uncertainties set forth in this Form 10-Q, the section entitled “Risk Factors” in the definitive proxy statement relating to the business combination filed by Star Peak on March 30, 2021, the Form 10-K/A filed by Star Peak with the SEC on April 26, 2021, and our Forms 8-K filed with or furnished to the SEC. If one or more of these or other risks or uncertainties materialize (or the consequences of any such development changes), or should our underlying assumptions prove incorrect, actual outcomes may vary materially from those reflected in our forward-looking statements. Statements in this second-quarter 2021 Form 10-Q are made as of August 11, 2021, and Stem disclaims any intention or obligation to update publicly or revise such statements, whether as a result of new information, future events or otherwise.

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Not required for smaller reporting companies.

ITEM 4. CONTROLS AND PROCEDURES

1. Disclosure Controls and Procedures

We maintain disclosure controls and procedures (Disclosure Controls) within the meaning of Rules 13a-15(e) and 15d-15(e) of the Securities Exchange Act of 1934, as amended, (the “Exchange Act”). Our Disclosure Controls are designed to ensure that information required to be disclosed by us in the reports we file or submit under the Exchange Act, such as this Quarterly Report on Form 10-Q, is recorded, processed, summarized and reported within the time periods specified in the Securities and Exchange Commission’s rules and forms. Our Disclosure Controls are also designed to ensure that such information is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate, to allow timely decisions regarding required disclosure. In designing and evaluating our Disclosure Controls, management recognized that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving the desired control objectives, and management necessarily applied its judgment in evaluating and implementing possible controls and procedures.

39

As of the end of the period covered by this Quarterly Report on Form 10-Q, we evaluated the effectiveness of the design and operation of our Disclosure Controls, which was done under the supervision and with the participation of our management, including our Chief Executive Officer and our Chief Financial Officer. Based on the evaluation of our Disclosure Controls, our Chief Executive Officer and Chief Financial Officer have concluded that, as of June 30, 2021, our Disclosure Controls were not effective due to a material weakness in the Company’s internal control over financial reporting as disclosed below.

2. Material Weaknesses in Internal Control Over Financial Reporting

During the course of preparing our financial statements as of and for the year ended December 31, 2020, management identified certain deficiencies in our internal controls over financial reporting that management believes to be a material weaknesses. A material weakness is a deficiency, or a combination of deficiencies, in internal control over financial reporting, such that a reasonable possibility exists that a material misstatement of our annual or interim financial statements would not be prevented or detected on a timely basis.

Specifically, the material weaknesses identified relate to (i) ineffective internal controls over accounting for complex and significant transactions, (ii) accounting for energy storage systems, deferred cost of goods sold and inventory, (iii) ineffective internal controls over review of the Company’s consolidated financial statements and related disclosures, (iv) a lack of formality in our internal control activities, especially related to management review-type controls, (v) ineffective internal controls over the review of certain revenue recognition calculations, and (vi) ineffective internal controls over the review of internal-use capitalized software calculations. With respect to accounting for complex and significant transactions, deficiencies exist in our process for ensuring the completeness of information utilized in various technical accounting analyses and, in certain instances, the proper application of the relevant accounting literature, including the determination of the appropriate valuation methodology. These deficiencies could result in material adjustments for certain transactions, including interest capitalization and accounting for convertible notes, and accounting and valuation of embedded derivatives and warrant liabilities. With respect to energy storage systems, inventory and deferred cost of goods sold, we did not properly track inflows and outflows, including the valuation of energy storage systems, due in part to the systems that the Company used to track and value energy storage systems and inventory. With respect to a lack of formality in our control activities, we did not sufficiently establish formal policies and procedures to design effective controls, establish responsibilities to execute these policies and procedures and hold individuals accountable for performance of these responsibilities, including over review over revenue recognition and internal-use capitalized software calculations. We had multiple control deficiencies aggregating to a material weakness over ineffective control activities.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements or prevent or detect all error and fraud. Any control system, no matter how well designed and operated, is based upon certain assumptions, and can provide only reasonable, not absolute, assurance that its objectives will be met. Further, no evaluation of controls can provide absolute assurance that misstatements due to error or fraud will not occur or that all control issues and instances of fraud, if any, within the Company have been detected. Projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

3. Plan to Remediate Material Weaknesses in Internal Control Over Financial Reporting

The Company, with oversight of the Audit Committee of the Board, is devoting significant time, attention, and resources to remediating the above material weaknesses in our internal control over financing reporting. As of June 30, 2021, the Company had initiated the following steps intended to remediate the material weakness described above and strengthen our internal control over financial reporting:

•Develop and deliver internal controls training to executives, other management and finance/accounting resources. The training includes a review of management’s and individual roles and responsibilities related to internal controls;

•Hire, train and develop experienced accounting executives and personnel with a level of public accounting knowledge and experience in the application of US GAAP commensurate with our financial reporting requirements and the complexity of our operations and transactions. A portion of their job responsibilities is to perform reviews, reconciliations and other financial reporting monitoring controls.

•Establish and implement policies and practices for the attraction, development and retention of competent public accounting personnel in alignment with objectives.

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We plan to continue to devote significant time and attention to remediate the above material weaknesses as soon as reasonably practicable. As we continue to evaluate our controls, we will make the necessary changes to improve our demonstration of commitment to attract, develop and retain competent individuals in alignment with objectives. We believe these actions will be sufficient to remediate the identified material weaknesses and strengthen our internal control over financial reporting; however, there can be no guarantee that such remediation will be sufficient. We will continue to evaluate the effectiveness of our controls and will make any further changes management determines appropriate.

Item 4. Changes in Internal Control over Financial Reporting

Except as described above, there were no changes in our internal control over financial reporting that occurred during the quarter to which this report relates, that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

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Part II - Other Information

ITEM 1. LEGAL PROCEEDINGS

The information with respect to this Item 1 is set forth under Note 13—Commitments and Contingencies, in the accompanying Consolidated Financial Statements.

ITEM 1A. RISK FACTORS

There have been no material changes to the risk factors disclosed in Part 1, Item 1A, of our registration statement on Form S-1 filed with the SEC on July 19, 2021.

ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

On June 30, 2021, the Company issued 4,683,349 shares of common stock (the “Exchange Shares”) to Star Peak Sponsor LLC, a Delaware limited liability company (“STPK Sponsor”), and Star Peak Sponsor Warrantco LLC, a Delaware limited liability company (together with STPK Sponsor, the “Sellers”). The issuance was pursuant to an Exchange Agreement dated as of June 25, 2021 by and among the Company and the Sellers (the “Exchange Agreement”). Pursuant to the Exchange Agreement and in consideration of the issuance to Sellers of the Exchange Shares, the Sellers exchanged 7,181,134 warrants originally issued to STPK Sponsor in a private placement that closed simultaneously with the initial public offering of the Company (f/k/a Star Peak Energy Transition Corp. The Exchange Shares were issued in reliance upon the exemption provided by Section 3(a)(9) of the Securities Act of 1933, as amended.

ITEM 3. DEFAULTS UPON SENIOR SECURITIES

None.

ITEM 4. MINE SAFETY DISCLOSURES

Not applicable.

ITEM 5. OTHER INFORMATION

None.

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ITEM 6. EXHIBIT INDEX

	EXHIBIT INDEX
Exhibit No.	Description
3.1	Second Amended and Restated Certificate of Incorporation, dated April 28, 2021 (incorporated by reference to Exhibit 3.1 to the Current Report on Form 8-K filed on May 4, 2021).
3.2	Second Amended and Restated by-Laws, dated April 28. 2021 (incorporated by reference to Exhibit 3.2 to the Current Report on Form 8-K filed on May 4, 2021).
10.1*	Form of Stock Option Agreement under the Stem, Inc. 2021 Equity Incentive Plan (+)
10.2*	Form of Restricted Stock Unit Award Agreement under the Stem, Inc. 2021 Equity Incentive Plan (+)
31.1*	Certification of Chief Executive Officer Pursuant to Rules 13a-14(a) and 15d-14(a) under the Securities Exchange Act of 1934, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31.2*	Certification of Chief Financial Officer Pursuant to Rules 13a-14(a) and 15d-14(a) under the Securities Exchange Act of 1934, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32.1*	Certification of Chief Executive Officer Pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
32.2*	Certification of Chief Financial Officer Pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101.INS*	Inline XBRL Instance Document
101.SCH*	Inline XBRL Taxonomy Extension Schema Document
101.CAL*	Inline XBRL Taxonomy Extension Calculation Linkbase Document
101.DEF*	Inline XBRL Taxonomy Extension Definition Linkbase Document
101.LAB*	Inline XBRL Taxonomy Extension Label Linkbase Document
101.PRE*	Inline XBRL Taxonomy Extension Presentation Linkbase Document
104	Cover Page Interactive Data File (embedded within the Inline XBRL document)
*	Filed herewith.
**	Furnished herewith.
+	Compensatory plans or arrangements.

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SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized, in the city of San Francisco, State of California on August 11, 2021.

STEM, INC.
By:	/s/ William Bush
	William Bush
	Chief Financial Officer

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EX-10.1

EXHIBIT 10.1

STEM, INC.

2021 EQUITY INCENTIVE PLAN

STOCK OPTION AGREEMENT

Unless otherwise defined herein, the terms defined in the 2021 Equity Incentive Plan (the “Plan”) shall have the same defined meanings in this Stock Option Agreement (the “Option Agreement”).

I.NOTICE OF STOCK OPTION GRANT

Name:

Address: ___________________________________________

The undersigned Participant has been granted an Option to purchase Common Stock of the Company, subject to the terms and conditions of the Plan and this Option Agreement, as follows:

Date of Grant:
Vesting Commencement Date:
Exercise Price per Share:
Total Number of Shares Granted:
Total Exercise Price:
Type of Option:	Incentive Stock Option (ISO)
	Nonstatutory Stock Option (NSO)
Term/Expiration Date:

Vesting Schedule:                    

This Option shall be exercisable, in whole or in part, according to the following vesting schedule:

The Option shall vest over four years with twenty-five percent (25%) of the shares subject to the Option vesting on the first anniversary of the Vesting Commencement Date and one forty-eighth (1/48th) of the shares subject to the Option vesting each month thereafter on the same day of the month as the Vesting Commencement Date (and if there is no corresponding day, on the last day of the month) until the fourth anniversary of the Vesting Commencement Date, subject to such Participant’s Continuous Service through each applicable vesting date.

Termination Period:

This Option shall be exercisable for three (3) months after Participant’s Continuous Service ceases, unless such cessation is due to Participant’s death or Disability, in which case this Option shall be exercisable for twelve (12) months after Participant’s Continuous Service ceases. Notwithstanding the foregoing sentence, in no event may this Option be exercised after the Term/Expiration Date as provided above and this Option may be subject to earlier termination as provided in the Plan.

II.AGREEMENT

1.Grant of Option. The Administrator of the Company hereby grants to the Participant named in the Notice of Stock Option Grant in Part I of this Agreement (“Participant”), an option (the “Option”) to purchase the number of Shares set forth in the Notice of Stock Option Grant, at the exercise price per Share set forth in the Notice of Stock Option Grant (the “Exercise Price”), and subject to the terms and conditions of the Plan, which is incorporated herein by reference. Subject to Section 18 of the Plan, in the event of a conflict between the terms and conditions of the Plan and this Option Agreement, the terms and conditions of the Plan shall prevail.

If designated in the Notice of Stock Option Grant as an Incentive Stock Option (“ISO”), this Option is intended to qualify as an Incentive Stock Option as defined in Section 422 of the Code. Nevertheless, to the extent that it exceeds the $100,000 rule of Code Section 422(d), this Option shall be treated as a Nonstatutory Stock Option (“NSO”). Further, if for any reason this Option (or portion thereof) shall not qualify as an ISO, then, to the extent of such nonqualification, such Option (or portion thereof) shall be regarded as a NSO granted under the Plan. In no event shall the Administrator, the Company or any Parent or Subsidiary or any of their respective employees or directors have any liability to Participant (or any other person) due to the failure of the Option to qualify for any reason as an ISO.

2.Exercise of Option.

(a)Right to Exercise. This Option shall be exercisable during its term in accordance with the Vesting Schedule set out in the Notice of Stock Option Grant and with the applicable provisions of the Plan and this Option Agreement.

(b)Method of Exercise. This Option shall be exercisable by delivery of an exercise notice (the “Exercise Notice”) in a manner and pursuant to such procedures as the Company may determine, which shall state the election to exercise the Option, the number of Shares with respect to which the Option is being exercised (the “Exercised Shares”), and such other representations and agreements as may be required by the Company. The Exercise Notice shall be accompanied by payment of the aggregate Exercise Price as to all Exercised Shares, together with any applicable tax withholding. This Option shall be deemed to be exercised upon receipt by the Company of such fully executed Exercise Notice accompanied by the aggregate Exercise Price, together with any applicable tax withholding.

-2-

No Shares shall be issued pursuant to the exercise of an Option unless such issuance and such exercise comply with applicable laws. Assuming such compliance, for income tax purposes the Shares shall be considered transferred to Participant on the date on which the Option is exercised with respect to such Shares.

3.Reserved.

4.Lock-Up Period. Participant hereby agrees that Participant shall not offer, pledge, sell, contract to sell, sell any option or contract to purchase, purchase any option or contract to sell, grant any option, right or warrant to purchase, lend, or otherwise transfer or dispose of, directly or indirectly, any Common Stock (or other securities) of the Company or enter into any swap, hedging or other arrangement that transfers to another, in whole or in part, any of the economic consequences of ownership of any Common Stock (or other securities) of the Company held by Participant (other than those included in the registration) for a period specified by the representative of the underwriters of Common Stock (or other securities) of the Company not to exceed one hundred and eighty (180) days following the effective date of any registration statement of the Company filed under the Securities Act (or such other period as may be requested by the Company or the underwriters to accommodate regulatory restrictions on (i) the publication or other distribution of research reports and (ii) analyst recommendations and opinions, including, but not limited to, the restrictions contained in NASD Rule 2711(f)(4) or NYSE Rule 472(f)(4), or any successor provisions or amendments thereto).

Participant agrees to execute and deliver such other agreements as may be reasonably requested by the Company or the underwriter which are consistent with the foregoing or which are necessary to give further effect thereto. In addition, if requested by the Company or the representative of the underwriters of Common Stock (or other securities) of the Company, Participant shall provide, within ten (10) days of such request, such information as may be required by the Company or such representative in connection with the completion of any public offering of the Company’s securities pursuant to a registration statement filed under the Securities Act. The obligations described in this Section 4 shall not apply to a registration relating solely to employee benefit plans on Form S-1 or Form S-8 or similar forms that may be promulgated in the future, or a registration relating solely to a Commission Rule 145 transaction on Form S-4 or similar forms that may be promulgated in the future. The Company may impose stop-transfer instructions with respect to the shares of Common Stock (or other securities) subject to the foregoing restriction until the end of said one hundred and eighty (180) day (or other) period. Participant agrees that any transferee of the Option or shares acquired pursuant to the Option shall be bound by this Section 4.

5.Method of Payment. Payment of the aggregate Exercise Price shall be by any of the following, or a combination thereof, at the election of the Participant:

(a)cash;

(b)check;

(c)consideration received by the Company under a formal cashless exercise program adopted by the Company in connection with the Plan; or

-3-

(d)surrender of other Shares which (i) shall be valued at its Fair Market Value on the date of exercise, and (ii) must be owned free and clear of any liens, claims, encumbrances or security interests, if accepting such Shares, in the sole discretion of the Company, shall not result in any adverse accounting consequences to the Company.

6.Restrictions on Exercise. This Option may not be exercised if the issuance of such Shares upon such exercise or the method of payment of consideration for such shares would constitute a violation of any applicable law.

7.Non-Transferability of Option.

(a)This Option may not be transferred in any manner otherwise than by will or by the laws of descent or distribution and may be exercised during the lifetime of Participant only by Participant. The terms of the Plan and this Option Agreement shall be binding upon the executors, administrators, heirs, successors and assigns of Participant.

8.Term of Option. This Option may be exercised only within the term set out in the Notice of Stock Option Grant, and may be exercised during such term only in accordance with the Plan and the terms of this Option Agreement.

9.Tax Obligations.

(a)Tax Withholding. Participant agrees to make appropriate arrangements with the Company (or the parent or Subsidiary employing or retaining Participant) for the satisfaction of all Federal, state, local and foreign income and employment tax withholding requirements applicable to the Option exercise. Participant acknowledges and agrees that the Company may refuse to honor the exercise and refuse to deliver the Shares if such withholding amounts are not delivered at the time of exercise.

(b)Notice of Disqualifying Disposition of ISO Shares. If the Option granted to Participant herein is an ISO, and if Participant sells or otherwise disposes of any of the Shares acquired pursuant to the ISO on or before the later of (i) the date two (2) years after the Date of Grant, or (ii) the date one (1) year after the date of exercise, Participant shall immediately notify the Company in writing of such disposition. Participant agrees that Participant may be subject to income tax withholding by the Company on the compensation income recognized by Participant.

10.Entire Agreement; Governing Law. The Plan is incorporated herein by reference. The Plan and this Option Agreement constitute the entire agreement of the parties with respect to the subject matter hereof and supersede in their entirety all prior undertakings and agreements of the Company and Participant with respect to the subject matter hereof, and may not be modified adversely to the Participant’s interest except by means of a writing signed by the Company and Participant. This Option Agreement is governed by the internal substantive laws but not the choice of law rules of California.

11.No Guarantee of Continued Service. PARTICIPANT ACKNOWLEDGES AND AGREES THAT THE VESTING OF SHARES PURSUANT TO THE VESTING SCHEDULE

-4-

HEREOF IS EARNED ONLY BY CONTINUING AS A SERVICE PROVIDER AT THE WILL OF THE COMPANY (OR THE PARENT OR SUBSIDIARY EMPLOYING OR RETAINING PARTICIPANT) AND NOT THROUGH THE ACT OF BEING HIRED, BEING GRANTED THIS OPTION OR ACQUIRING SHARES HEREUNDER. PARTICIPANT FURTHER ACKNOWLEDGES AND AGREES THAT THIS AGREEMENT, THE TRANSACTIONS CONTEMPLATED HEREUNDER AND THE VESTING SCHEDULE SET FORTH HEREIN DO NOT CONSTITUTE AN EXPRESS OR IMPLIED PROMISE OF CONTINUED ENGAGEMENT AS A SERVICE PROVIDER FOR THE VESTING PERIOD, FOR ANY PERIOD, OR AT ALL, AND SHALL NOT INTERFERE IN ANY WAY WITH PARTICIPANT’S RIGHT OR THE RIGHT OF THE COMPANY (OR THE PARENT OR SUBSIDIARY EMPLOYING OR RETAINING PARTICIPANT) TO TERMINATE PARTICIPANT’S RELATIONSHIP AS A SERVICE PROVIDER AT ANY TIME, WITH OR WITHOUT CAUSE.

Participant acknowledges receipt of a copy of the Plan and represents that he or she is familiar with the terms and provisions thereof, and hereby accepts this Option subject to all of the terms and provisions thereof. Participant has reviewed the Plan and this Option in their entirety, has had an opportunity to obtain the advice of counsel prior to executing this Option and fully understands all provisions of the Option. Participant hereby agrees to accept as binding, conclusive and final all decisions or interpretations of the Administrator upon any questions arising under the Plan or this Option. Participant further agrees to notify the Company upon any change in the residence address indicated below.

PARTICIPANT        STEM, INC.

Signature        By

Print Name        Print Name

            Title

Residence Address

-5-

EX-10.2

EXHIBIT 10.2

FORM

STEM, INC.

2021 EQUITY INCENTIVE PLAN

GRANT NOTICE FOR

RESTRICTED STOCK UNIT AWARD

FOR GOOD AND VALUABLE CONSIDERATION, Stem, Inc. (the“Company”), hereby grants to the Participant named below the number of Restricted Stock Units (the “RSUs”) specified below (the “Award”) under the Stem, Inc. 2021 Equity Incentive Plan (as amended from time to time, the “Plan”). Each RSU represents the right to receive one share of Common Stock, upon the terms and subject to the conditions set forth in this Grant Notice, the Plan and the Standard Terms and Conditions (the “Standard Terms and Conditions”) promulgated under such Plan and attached hereto as Exhibit A. This Award is granted pursuant to the Plan and is subject to and qualified in its entirety by the Standard Terms and Conditions. Capitalized terms not otherwise defined herein shall have the meaning set forth in the Plan.

Name of Participant:

Grant Date:

Vesting Commencement Date:

Number of RSUs:

Vesting Schedule:

IN ORDER TO RECEIVE THE BENEFITS OF THIS AGREEMENT, PARTICIPANT MUST EXECUTE AND RETURN THIS GRANT NOTICE (THE “ACCEPTANCE REQUIREMENTS”). IF YOU FAIL TO SATISFY THE ACCEPTANCE REQUIREMENTS WITHIN 60 DAYS AFTER THE GRANT DATE, THEN THIS GRANT NOTICE WILL BE OF NO FORCE OR EFFECT AND THIS AWARD WILL BE AUTOMATICALLY FORFEITED TO THE COMPANY WITHOUT CONSIDERATION.

By accepting this Grant Notice, Participant acknowledges that Participant has received and read, and agrees that this Award shall be subject to, the terms of this Grant Notice, the Plan, and the Standard Terms and Conditions.

STEM, INC.

By:

Name:

Title:

PARTICIPANT

[Name]

Signature Page to

Grant Notice for

Restricted Stock Unit Award

EXHIBIT A

STEM, INC.
2021 EQUITY INCENTIVE PLAN

STANDARD TERMS AND CONDITIONS FOR
RESTRICTED STOCK UNITS

These Standard Terms and Conditions apply to the Award of Restricted Stock Units granted pursuant to the Stem, Inc. 2021 Equity Incentive Plan (the “Plan”), which are evidenced by a Grant Notice or an action of the Committee that specifically refers to these Standard Terms and Conditions. In addition to these Standard Terms and Conditions, the Restricted Stock Units shall be subject to the terms of the Plan, which are incorporated into these Standard Terms and Conditions by this reference. Capitalized terms not otherwise defined herein shall have the meaning set forth in the Plan.

1.TERMS OF RESTRICTED STOCK UNITS

Stem, Inc. (the “Company”) has granted to the Participant named in the Grant Notice provided to said Participant herewith (the “Grant Notice”) an award of Restricted Stock Units (the “Award” or “RSUs”) specified in the Grant Notice, with each Restricted Stock Unit representing the right to receive one share of Common Stock. The Award is subject to the conditions set forth in the Grant Notice, these Standard Terms and Conditions and the Plan. For purposes of these Standard Terms and Conditions and the Grant Notice, any reference to the Company shall include a reference to any Subsidiary.

2.VESTING AND SETTLEMENT OF RESTRICTED STOCK UNITS

(a)The Award shall not be vested as of the Grant Date set forth in the Grant Notice and shall be forfeitable unless and until otherwise vested pursuant to the terms of the Grant Notice and these Standard Terms and Conditions. After the Grant Date, subject to termination or acceleration as provided in these Standard Terms and Conditions and the Plan, the Award shall become vested as described in the Grant Notice with respect to that number of Restricted Stock Units as set forth in the Grant Notice. Restricted Stock Units that have vested and are no longer subject to forfeiture are referred to herein as “Vested RSUs.” Restricted Stock Units awarded hereunder that are not vested and remain subject to forfeiture are referred to herein as “Unvested RSUs.”

(b)As soon as administratively practicable following the vesting of the RSUs pursuant to the Grant Notice and this Section 2, but in no event later than 30 days after each vesting date, the Company shall deliver to the Participant a number of shares of Common Stock equal to the number of RSUs that vested on such date.

(c)Upon Participant’s termination of Continuous Service for any reason, any then Unvested RSUs held by the Participant shall be forfeited and canceled as of the date of the Participant’s termination of Continuous Service.

Exhibit A

Standard Terms and Conditions

3.RIGHTS AS STOCKHOLDER; DIVIDEND EQUIVALENTS

(a)Participant shall not be, nor have any of the rights or privileges of, a stockholder of the Company in respect of any RSUs unless and until shares of Common Stock settled for such RSUs shall have been issued by the Company to Participant (as evidenced by the appropriate entry on the books and records of the Company or of a duly authorized transfer agent of the Company).

(b)Notwithstanding the foregoing, from and after the Grant Date and until the earlier of (i) the Participant’s receipt of Common Stock upon settlement of the RSUs and (ii) the time when the Participant’s right to receive Common Stock upon settlement of the RSUs is forfeited, the Participant shall be entitled, as a Dividend equivalent, to a number of additional whole RSUs on the date that the Company pays a cash dividend (if any) to holders of Common Stock generally. Such Dividend equivalent shall be determined by dividing (i) the product of (A) the dollar amount of the cash dividend paid per share of Common Stock on such date and (B) the total number of RSUs (including dividend equivalents paid thereon) previously credited to the Participant as of such date, by (ii) the Fair Market Value per share of Common Stock on such date. Such Dividend equivalents (if any) shall be subject to the same terms and conditions and shall be settled or forfeited in the same manner and at the same time as the RSUs to which the Dividend equivalents were credited.

4.RESTRICTIONS ON RESALES OF SHARES

The Company may impose such restrictions, conditions or limitations as it determines appropriate as to the timing and manner of any resales by the Participant or other subsequent transfers by the Participant of any shares of Common Stock issued pursuant to Vested RSUs, including (a) restrictions under an insider trading policy, (b) restrictions designed to delay and/or coordinate the timing and manner of sales by Participant and other holders and (c) restrictions as to the use of a specified brokerage firm for such resales or other transfers.

5.INCOME TAXES

Participant acknowledges and agrees that Participant shall be solely responsible for satisfying any and all national, state, local or other tax withholding obligation relating to the RSUs. Unless the Participant elects to instead tender a cash payment in satisfaction of such tax withholding obligations in the manner prescribed by the Company, the Participant acknowledges and agrees that the Company, or any brokerage firm deemed acceptable by the Company, shall generate enough cash proceeds to satisfy such tax withholding obligations by selling on the Participant’s behalf a sufficient number of shares of Common Stock from shares of Common Stock otherwise issuable to the Participant upon the vesting and settlement of the RSUs. Such shares of Common Stock will be sold on the day such tax withholding obligations arise or, if such day is not a trading day, the next following trading day. The Participant shall be responsible for all broker’s fees and other costs of sale. The Participant acknowledges that the Company or its designee is under no obligation to arrange for such sale at any particular price, and that the proceeds of any such sale may not be sufficient to satisfy the Participant’s tax withholding obligations. Accordingly, the Participant agrees to pay to the Company as soon as

A-2

practicable, including through additional payroll withholding, any amount of the tax withholding obligations that are not satisfied by the sale of shares of Common Stock described above.

6.NONTRANSFERABILITY OF AWARD

The Participant understands, acknowledges and agrees that, except as otherwise provided in the Plan or as permitted by the Committee, the Award may not be sold, assigned, transferred, pledged or otherwise directly or indirectly encumbered or disposed of other than by will or the laws of descent and distribution.

7.OTHER AGREEMENTS SUPERSEDED

The Grant Notice, these Standard Terms and Conditions and the Plan constitute the entire understanding between the Participant and the Company regarding the Award. Any prior agreements, commitments or negotiations concerning the Award are superseded.

8.LIMITATION OF INTEREST IN SHARES SUBJECT TO RESTRICTED STOCK UNITS

Neither the Participant (individually or as a member of a group) nor any beneficiary or other person claiming under or through the Participant shall have any right, title, interest, or privilege in or to any shares of Common Stock allocated or reserved for the purpose of the Plan or subject to the Grant Notice or these Standard Terms and Conditions except as to such shares of Common Stock, if any, as shall have been issued to such person in connection with the Award. Nothing in the Plan, in the Grant Notice, these Standard Terms and Conditions or any other instrument executed pursuant to the Plan shall confer upon the Participant any right to continue to serve the Company or an Affiliate in the capacity in effect at the time this Award was granted or any other capacity or will affect the right of the Company or an Affiliate to terminate the service of the Participant.

9.GENERAL

(a)In the event that any provision of these Standard Terms and Conditions is declared to be illegal, invalid or otherwise unenforceable by a court of competent jurisdiction, such provision shall be reformed, if possible, to the extent necessary to render it legal, valid and enforceable, or otherwise deleted, and the remainder of these Standard Terms and Conditions shall not be affected except to the extent necessary to reform or delete such illegal, invalid or unenforceable provision.

(b)The headings preceding the text of the sections hereof are inserted solely for convenience of reference, and shall not constitute a part of these Standard Terms and Conditions, nor shall they affect its meaning, construction or effect. Words in the masculine gender shall include the feminine gender, and where appropriate, the plural shall include the singular and the singular shall include the plural. The use herein of the word “including” following any general statement, term or matter shall not be construed to limit such statement, term or matter to the specific items or matters set forth immediately following such word or to

A-3

similar items or matters, whether or not non-limiting language (such as “without limitation”, “but not limited to”, or words of similar import) is used with reference thereto, but rather shall be deemed to refer to all other items or matters that could reasonably fall within the broadest possible scope of such general statement, term or matter. References herein to any agreement, instrument or other document means such agreement, instrument or other document as amended, supplemented and modified from time to time to the extent permitted by the provisions thereof and not prohibited by the Plan or these Standard Terms and Conditions.

(c)These Standard Terms and Conditions shall inure to the benefit of and be binding upon the parties hereto and their respective permitted heirs, beneficiaries, successors and assigns.

(d)These Standard Terms and Conditions shall be construed in accordance with and governed by the laws of the State of Delaware, without regard to principles of conflicts of law.

(e)In the event of any conflict between the Grant Notice, these Standard Terms and Conditions and the Plan, the Grant Notice and these Standard Terms and Conditions shall control. In the event of any conflict between the Grant Notice and these Standard Terms and Conditions, the Grant Notice shall control.

(f)All questions arising under the Plan or under these Standard Terms and Conditions shall be decided by the Committee in its total and absolute discretion.

10.ELECTRONIC DELIVERY

By executing the Grant Notice, the Participant hereby consents to the delivery of information (including, without limitation, information required to be delivered to the Participant pursuant to applicable securities laws) regarding the Company and the Subsidiaries, the Plan, and the Restricted Stock Units via Company web site or other electronic delivery.

A-4

EX-31.1

EXHIBIT 31.1

CERTIFICATION

PURSUANT TO RULES 13a-14(a) AND 15d-14(a) UNDER THE SECURITIES EXCHANGE ACT OF 1934, AS ADOPTED PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, John Carrington, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q for the three months ended June 30, 2021 of Stem, Inc.;.

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officers and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a–15(f) and 15d–15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) [Paragraph intentionally omitted in accordance with SEC Release Nos. 34-47986 and 34-54942];

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officers and I have disclosed, based on my most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal controls over financial reporting.

	STEM, INC.
Date: August 11, 2021	By:	/s/ John Carrington
		Name:	John Carrington
		Title:	Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATION

PURSUANT TO RULES 13a-14(a) AND 15d-14(a) UNDER THE SECURITIES EXCHANGE ACT OF 1934, AS ADOPTED PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, William Bush, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q for the three months ended June 30, 2021 of Stem, Inc.;.

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officers and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a–15(f) and 15d–15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) [Paragraph intentionally omitted in accordance with SEC Release Nos. 34-47986 and 34-54942];

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officers and I have disclosed, based on my most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal controls over financial reporting.

	STEM, INC.
Date: August 11, 2021	By:	/s/ William Bush
		Name:	William Bush
		Title:	Chief Financial Officer

EX-32.1

Exhibit 32.1

CERTIFICATION

PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Stem, Inc. on Form 10-Q for the three months ended June 30, 2021 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, John Carrington, Chief Executive Officer and Director of the registrant, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to my knowledge:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operation of the registrant.

	STEM, INC.
Date: August 11, 2021	By:	/s/ John Carrington
		Name:	John Carrington
		Title:	Chief Executive Officer

EX-32.2

Exhibit 32.2

CERTIFICATION

PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Stem, Inc. on Form 10-Q for the three months ended June 30, 2021 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, William Bush, Chief Financial Officer of the registrant, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to my knowledge:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operation of the registrant.

	STEM, INC.
Date: August 11, 2021	By:	/s/ William Bush
		Name:	William Bush
		Title:	Chief Financial Officer

XML

Cover - shares	6 Months Ended
	Jun. 30, 2021	Aug. 10, 2021
Entity Listings [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2021
Document Transition Report	false
Entity Registrant Name	STEM, INC.
Entity Incorporation, State or Country Code	DE
Entity File Number	333-251397
Entity Tax Identification Number	85-1972187
Entity Address, Address Line One	100 California St., 14th Fl
Entity Address, City or Town	San Francisco
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94111
Country Region	1
City Area Code	877
Local Phone Number	374-7836
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		131,008,933
Entity Central Index Key	0001758766
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q2
Amendment Flag	false
Common Stock
Entity Listings [Line Items]
Title of 12(b) Security	Common Stock, par value $0.0001
Trading Symbol	STEM
Security Exchange Name	NYSE
Common Stock Warrants
Entity Listings [Line Items]
Title of 12(b) Security	Warrants, each whole warrant exercisable for Common Stock at an exercise price of $11.50 per share
Trading Symbol	STEM WS
Security Exchange Name	NYSE

XML

CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 474,138	$ 6,942
Accounts receivable, net	17,833	13,572
Inventory, net	27,167	20,843
Other current assets (includes $206 and $123 due from related parties as of June 30, 2021 and December 31, 2020, respectively)	19,199	7,920
Total current assets	538,337	49,277
Energy storage systems, net	118,216	123,703
Contract origination costs, net	11,668	10,404
Goodwill	1,786	1,739
Intangible assets, net	12,387	12,087
Other noncurrent assets	15,945	8,640
Total assets	698,339	205,850
Current liabilities:
Accounts payable	17,798	13,749
Accrued liabilities	9,177	16,072
Accrued payroll	4,565	5,976
Notes payable, current portion	0	33,683
Convertible promissory notes (includes $— and $45,271 due to related parties as of June 30, 2021 and December 31, 2020, respectively)	0	67,590
Financing obligation, current	15,336	14,914
Deferred revenue, current	37,056	36,942
Other current liabilities (includes $880 and $399 due to related parties as of June 30, 2021 and December 31, 2020, respectively)	1,910	1,589
Total current liabilities	85,842	190,515
Deferred revenue, noncurrent	18,648	15,468
Asset retirement obligation	4,178	4,137
Notes payable, noncurrent	1,719	4,612
Financing obligation, noncurrent	74,496	73,128
Warrant liabilities	303,798	95,342
Lease liability, noncurrent	880	57
Total liabilities	489,561	383,259
Commitments and contingencies
Stockholders’ equity (deficit):
Preferred stock, $0.0001 par value; 1,000,000 shares authorized as of June 30, 2021 and December 31, 2020, respectively; 0 shares issued and outstanding as of June 30, 2021 and December 31, 2020	0	0
Common stock, $0.0001 par value; 500,000,000 shares authorized as of June 30, 2021 and December 31, 2020; 130,768,055 and 40,202,785 issued and outstanding as of June 30, 2021 and December 31, 2020, respectively	13	4
Additional paid-in capital	799,918	230,620
Accumulated other comprehensive loss	(543)	(192)
Accumulated deficit	(590,610)	(407,841)
Total stockholders’ equity (deficit)	208,778	(177,409)
Total liabilities and stockholders’ equity (deficit)	$ 698,339	$ 205,850

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CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Other current assets, due from related parties	$ 206	$ 123
Convertible promissory notes, due to related parties	0	45,271
Other current liabilities, due to related parties	$ 880	$ 399
Preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized (in shares)	1,000,000	1,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	500,000,000	500,000,000
Common stock, shares issued (in shares)	130,768,055	40,202,785
Common stock, shares outstanding (in shares)	130,768,055	40,202,785

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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenue	$ 19,337	$ 4,379	$ 34,758	$ 8,489
Cost of revenue	19,464	6,124	35,001	11,620
Gross margin	(127)	(1,745)	(243)	(3,131)
Operating expenses:
Sales and marketing	3,913	4,242	6,580	8,646
Research and development	4,827	3,619	9,234	7,032
General and administrative	15,014	2,404	17,706	5,383
Total operating expenses	23,754	10,265	33,520	21,061
Loss from operations	(23,881)	(12,010)	(33,763)	(24,192)
Other income (expense), net:
Interest expense	(3,929)	(5,192)	(10,162)	(9,561)
Loss on extinguishment of debt	(5,064)	0	(5,064)	0
Change in fair value of warrants and embedded derivative	(67,179)	(1,918)	(133,577)	(909)
Other income (expenses), net	(163)	139	(203)	(1,790)
Total other income (expense)	(76,335)	(6,971)	(149,006)	(12,260)
Loss before income taxes	(100,216)	(18,981)	(182,769)	(36,452)
Income tax expense	0	0	0	0
Net loss	$ (100,216)	$ (18,981)	$ (182,769)	$ (36,452)
Net loss per share attributable to common shareholders, basic (in dollars per share)	$ (1.00)	$ (0.48)	$ (2.59)	$ (1.14)
Net loss per share attributable to common shareholders, diluted (in dollars per share)	$ (1.00)	$ (0.48)	$ (2.59)	$ (1.14)
Weighted-average shares used in computing net loss per share, basic (in shares)	100,611,965	39,801,379	70,684,750	40,209,877
Weighted-average shares used in computing net loss per share, diluted (in shares)	100,611,965	39,801,379	70,684,750	40,209,877
Service
Revenue	$ 5,153	$ 3,670	$ 10,035	$ 7,062
Cost of revenue	5,809	5,510	12,715	10,255
Hardware
Revenue	14,184	709	24,723	1,427
Cost of revenue	$ 13,655	$ 614	$ 22,286	$ 1,365

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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net loss	$ (100,216)	$ (18,981)	$ (182,769)	$ (36,452)
Other comprehensive income:
Foreign currency translation adjustment	(602)	(209)	(351)	242
Total comprehensive loss	$ (100,818)	$ (19,190)	$ (183,120)	$ (36,210)

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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY (DEFICIT) (UNAUDITED) - USD ($) $ in Thousands	Total	Convertible Notes	Warrant	Previously Reported	Retroactive application of recapitalization	Series 1 Convertible Preferred Stock	Series 1 Convertible Preferred Stock Previously Reported	Series 1 Convertible Preferred Stock Retroactive application of recapitalization	Common Stock	Common Stock Convertible Notes	Common Stock Warrant	Common Stock Previously Reported	Common Stock Retroactive application of recapitalization	Additional Paid-In Capital	Additional Paid-In Capital Convertible Notes	Additional Paid-In Capital Warrant	Additional Paid-In Capital Previously Reported	Additional Paid-In Capital Retroactive application of recapitalization	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) Previously Reported	Accumulated Other Comprehensive Income (Loss) Retroactive application of recapitalization	Accumulated Deficit	Accumulated Deficit Previously Reported	Accumulated Deficit Retroactive application of recapitalization
Beginning balance (in shares) at Dec. 31, 2019	0			191,139,933	(191,139,933)
Beginning balance at Dec. 31, 2019	$ 0			$ 231,129	$ (231,129)
Ending balance (in shares) at Mar. 31, 2020	0
Ending balance at Mar. 31, 2020	$ 0
Beginning balance (in shares) at Dec. 31, 2019						0	2,961	(2,961)	43,189,195			9,392,682	33,796,513
Beginning balance at Dec. 31, 2019	(24,532)			$ (255,661)	$ 231,129	$ 0	$ 0	$ 0	$ 3			$ 0	$ 3	$ 234,465			$ 3,339	$ 231,126	$ 54	$ 54	$ 0	$ (259,054)	$ (259,054)	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Effect of exchange transaction (in shares)									(3,448,648)
Effect of exchange transaction	(3,268)													(10,605)								7,337
Issuance of common stock upon exercise of stock options and warrants (in shares)									15,457
Issuance of common stock upon exercise of stock options and warrants	21													21
Stock-based compensation	456													456
Foreign currency translation adjustment	451																		451
Net loss	(17,471)																					(17,471)
Ending balance (in shares) at Mar. 31, 2020						0			39,756,004
Ending balance at Mar. 31, 2020	$ (44,343)					$ 0			$ 3					224,337					505			(269,188)
Beginning balance (in shares) at Dec. 31, 2019	0			191,139,933	(191,139,933)
Beginning balance at Dec. 31, 2019	$ 0			$ 231,129	$ (231,129)
Ending balance (in shares) at Jun. 30, 2020	0
Ending balance at Jun. 30, 2020	$ 0
Beginning balance (in shares) at Dec. 31, 2019						0	2,961	(2,961)	43,189,195			9,392,682	33,796,513
Beginning balance at Dec. 31, 2019	(24,532)			$ (255,661)	$ 231,129	$ 0	$ 0	$ 0	$ 3			$ 0	$ 3	234,465			3,339	231,126	54	54	0	(259,054)	(259,054)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Foreign currency translation adjustment	242
Net loss	(36,452)
Ending balance (in shares) at Jun. 30, 2020						0			39,843,946
Ending balance at Jun. 30, 2020	$ (62,885)					$ 0			$ 3					224,985					296			(288,169)
Beginning balance (in shares) at Mar. 31, 2020	0
Beginning balance at Mar. 31, 2020	$ 0
Ending balance (in shares) at Jun. 30, 2020	0
Ending balance at Jun. 30, 2020	$ 0
Beginning balance (in shares) at Mar. 31, 2020						0			39,756,004
Beginning balance at Mar. 31, 2020	(44,343)					$ 0			$ 3					224,337					505			(269,188)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock option and stock warrant exercises	168													168
Issuance of common stock upon exercise of stock options and warrants (in shares)									87,942
Issuance of common stock upon exercise of stock options and warrants	4													4
Stock-based compensation	476													476
Foreign currency translation adjustment	(209)																		(209)
Net loss	(18,981)																					(18,981)
Ending balance (in shares) at Jun. 30, 2020						0			39,843,946
Ending balance at Jun. 30, 2020	$ (62,885)					$ 0			$ 3					224,985					296			(288,169)
Beginning balance (in shares) at Dec. 31, 2020	0			175,437,783	(175,437,783)
Beginning balance at Dec. 31, 2020	$ 0			$ 220,563	$ (220,563)
Ending balance (in shares) at Mar. 31, 2021	0
Ending balance at Mar. 31, 2021	$ 0
Beginning balance (in shares) at Dec. 31, 2020						0	2,961	(2,961)	40,202,785			11,228,371	28,974,414
Beginning balance at Dec. 31, 2020	(177,409)			$ (397,972)	$ 220,563	$ 0	$ 0	$ 0	$ 4			$ 0	$ 4	230,620			10,061	220,559	(192)	(192)	0	(407,841)	(407,841)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of beneficial conversion feature related to convertible notes (Note 7)	1,126													1,126
Stock option and stock warrant exercises (in shares)									1,412,025
Stock option and stock warrant exercises	3,147													3,147
Stock-based compensation	784													784
Foreign currency translation adjustment	251																		251
Net loss	(82,553)																					(82,553)
Ending balance (in shares) at Mar. 31, 2021						0			41,614,810
Ending balance at Mar. 31, 2021	$ (254,654)					$ 0			$ 4					235,677					59			(490,394)
Beginning balance (in shares) at Dec. 31, 2020	0			175,437,783	(175,437,783)
Beginning balance at Dec. 31, 2020	$ 0			$ 220,563	$ (220,563)
Ending balance (in shares) at Jun. 30, 2021	0
Ending balance at Jun. 30, 2021	$ 0
Beginning balance (in shares) at Dec. 31, 2020						0	2,961	(2,961)	40,202,785			11,228,371	28,974,414
Beginning balance at Dec. 31, 2020	(177,409)			$ (397,972)	$ 220,563	$ 0	$ 0	$ 0	$ 4			$ 0	$ 4	230,620			$ 10,061	$ 220,559	(192)	$ (192)	$ 0	(407,841)	$ (407,841)	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Foreign currency translation adjustment	(351)
Net loss	(182,769)
Ending balance (in shares) at Jun. 30, 2021						0			130,768,055
Ending balance at Jun. 30, 2021	$ 208,778					$ 0			$ 13					799,918					(543)			(590,610)
Beginning balance (in shares) at Mar. 31, 2021	0
Beginning balance at Mar. 31, 2021	$ 0
Ending balance (in shares) at Jun. 30, 2021	0
Ending balance at Jun. 30, 2021	$ 0
Beginning balance (in shares) at Mar. 31, 2021						0			41,614,810
Beginning balance at Mar. 31, 2021	(254,654)					$ 0			$ 4					235,677					59			(490,394)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Merger and PIPE financing (in shares)									70,428,326
Merger and PIPE financing (Note 1)	247,018								$ 7					247,011
Conversion of securities into common stock upon Merger (in shares)										10,921,548	2,759,970
Conversion of securities into common stock upon Merger		$ 77,748	$ 60,568							$ 1					$ 77,747	$ 60,568
Exchange of warrants into common stock (in shares)									4,683,349
Exchange of warrants into common stock (Note 8)	168,647								$ 1					168,646
Issuance of common stock warrants for services (Note 8)	9,183													9,183
Stock option and stock warrant exercises (in shares)									360,052
Stock option and stock warrant exercises	39													39
Stock-based compensation	1,047													1,047
Foreign currency translation adjustment	(602)																		(602)
Net loss	(100,216)																					(100,216)
Ending balance (in shares) at Jun. 30, 2021						0			130,768,055
Ending balance at Jun. 30, 2021	$ 208,778					$ 0			$ 13					$ 799,918					$ (543)			$ (590,610)

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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
OPERATING ACTIVITIES
Net loss	$ (182,769)	$ (36,452)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization expense	10,315	7,918
Non-cash interest expense, including interest expenses associated with debt issuance costs	7,119	4,570
Stock-based compensation	1,784	932
Change in fair value of warrant liability and embedded derivative	133,577	909
Noncash lease expense	334	286
Accretion expense	112	160
Impairment of energy storage systems	1,275	947
Issuance of warrants for services	9,183	0
Changes in operating assets and liabilities:
Accounts receivable	(4,219)	2,212
Inventory	(6,323)	(6,340)
Other assets	(16,924)	(2,691)
Contract origination costs	(1,650)	(1,383)
Accounts payable and accrued expenses	3,292	412
Deferred revenue	3,294	12,308
Lease liabilities	(289)	(310)
Other liabilities	56	25
Net cash used in operating activities	(41,833)	(16,497)
INVESTING ACTIVITIES
Purchase of energy storage systems	(5,603)	(7,555)
Capital expenditures on internally-developed software	(2,693)	(2,628)
Purchase of property and equipment	(300)	0
Net cash used in investing activities	(8,596)	(10,183)
FINANCING ACTIVITIES
Proceeds from exercise of stock options and warrants	2,933	54
Net contributions from Merger and PIPE financing, net of transaction costs of $58,061	550,322	0
Proceeds from financing obligations	4,929	8,391
Repayment of financing obligations	(4,609)	(4,267)
Proceeds from issuance of convertible notes, net of issuance costs of $8 and $911 for the six months ended June 30, 2021 and 2020, respectively	1,118	14,050
Proceeds from issuance of notes payable, net of issuance costs of $101 and $1,502 for the six months ended June 30, 2021 and 2020, respectively	3,940	23,498
Repayment of notes payable	(41,446)	(19,665)
Net cash provided by financing activities	517,187	22,061
Effect of exchange rate changes on cash and cash equivalents	438	(176)
Net increase (decrease) in cash and cash equivalents	467,196	(4,795)
Cash and cash equivalents, beginning of period	6,942	12,889
Cash and cash equivalents, end of period	474,138	8,094
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash paid for interest	7,131	4,534
NON-CASH INVESTING AND FINANCING ACTIVITIES
Change in asset retirement costs and asset retirement obligation	71	76
Exchange of warrants for common stock	168,647	0
Conversion of warrants upon merger	60,568	0
Conversion of convertible notes upon merger	77,748	0
Conversion of accrued interest into outstanding note payable	337	128
Right-of-use asset obtained in exchange for lease liability	1,230	0
Settlement of warrant liability into preferred stock due to exercise	$ 253	$ 0
Issuance of warrants upon debt modification	0	168,000
Stock-based compensation capitalized to internal-use software	$ 47	$ 0

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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (Parenthetical) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Transaction costs	$ 58,061
Convertible Notes
Payment of debt issuance costs	8	$ 911
Notes Payable
Payment of debt issuance costs	$ 101	$ 1,502

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BUSINESS

6 Months Ended

Jun. 30, 2021

Organization, Consolidation and Presentation of Financial Statements [Abstract]

BUSINESS

BUSINESS

Description of the Business

Stem, Inc. and its subsidiaries (together, “Stem” or the “Company”) is an energy technology company that creates innovative technology services that transform the way energy is distributed and consumed. Through its technology, the Company enables businesses to control their electricity expense and helps the electrical grid be more efficient in managing peak usage. The Company operated as Rollins Road Acquisition Company (f/k/a Stem, Inc.) (“Legacy Stem”) prior to the Merger (as defined below).

Stem, Inc. was incorporated on March 16, 2009 in the State of Delaware and is headquartered in San Francisco, California.

Star Peak Acquisition Corp. Merger

On December 3, 2020, the Company entered into an Agreement and Plan of Merger (the “Merger Agreement”) with Star Peak Transition Corp. (“STPK”, prior to the closing of the Merger and the “New Stem”, following the closing of the Merger), an entity listed on the New York Stock Exchange under the trade symbol “STPK”, and STPK Merger Sub Corp., a Delaware corporation and wholly owned subsidiary of STPK (“Merger Sub”), providing for, among other things, and subject to the conditions therein, the combination of the Company and STPK pursuant to the merger of Merger Sub with and into the Company with the Company continuing as the surviving entity (the “Merger”).

On April 28, 2021, shareholders of STPK approved the Merger, under which Stem received approximately $550.3 million, net of fees and expenses as follows:

	Recapitalization
Cash — STPK trust and working capital cash	$	383,383
Cash — PIPE	225,000
Less: transaction costs and advisory fees paid	(58,061)
Merger and PIPE financing	$	550,322

Immediately prior to the closing of the Merger, (i) all issued and outstanding shares of Legacy Stem preferred stock, par value $0.00001 per share (the “Legacy Stem Preferred Stock”), were converted into shares of Legacy Stem common stock, par value $0.000001 per share (the “Legacy Stem Common Stock”) in accordance with Legacy Stem’s amended and restated certificate of incorporation, (ii) all outstanding convertible promissory notes of Legacy Stem (the “Legacy Stem Convertible Notes”) were converted into Legacy Stem Preferred Stock in accordance with the terms of the Legacy Stem Convertible Notes and (iii) certain warrants issued by Legacy Stem to purchase Legacy Stem Common Stock and Legacy Stem Preferred Stock (the “Legacy Stem Warrants”) were exercised by holders into Legacy Stem Common Stock in accordance with the terms thereof. Upon the consummation of the Merger, each share of Legacy Stem common stock then issued and outstanding was canceled and converted into the right to receive shares of Class A common stock of Stem using an exchange ratio of 4.6432 (the “Exchange Ratio”).

In connection with the execution of the Merger Agreement, STPK entered into separate subscription agreements (each, a “Subscription Agreement”) with a number of investors (each a “Subscriber”), pursuant to which the Subscribers agreed to purchase, and STPK agreed to sell to the Subscribers, an aggregate of 22,500,000 shares of common stock (the “PIPE Shares”), for a purchase price of $10 per share and an aggregate purchase price of $225.0 million, in a private placement pursuant to the subscription agreements (the “PIPE”). The PIPE investment closed simultaneously with the consummation of the Merger. The Merger is accounted for as a reverse recapitalization in accordance with GAAP. Under this method of accounting, STPK was treated as the “acquired” company for financial reporting purposes. Accordingly, for accounting purposes, the Merger was treated as the equivalent of Stem issuing stock for the net assets of STPK, accompanied by a recapitalization. The net liabilities of STPK of $304.0 million, comprised primarily of the warrant liabilities associated with the Public and Private Placement Warrants discussed in Note 8, are stated at historical cost, with no goodwill or other intangible assets recorded.

Liquidity and Going Concern

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) and with the instructions to Form 10-Q and Article 10 of the Regulation S-X, assuming the Company will continue as a going concern. As of June 30, 2021, the Company had cash and cash equivalents of $474.1 million, an accumulated deficit of $590.6 million and net working capital of $452.5 million, with $15.3 million of financing obligation coming due within the next 12 months. During the six months ended June 30, 2021, the Company incurred a net loss of $182.8 million and had negative cash flows from operating activities of $41.8 million. However, the Merger provided the Company with a significant amount of cash proceeds and, as such, the Company believes that its cash position, inclusive of funds raised with the Merger, is sufficient to meet capital and liquidity requirements for at least the next 12 months after the date that the financial statements are available to be issued.

The Company’s business prospects are subject to risks, expenses, and uncertainties frequently encountered by companies in the early stages of commercial operations. Prior to the Merger, the Company had been funded primarily by equity financings, convertible promissory notes and borrowings from affiliates. The attainment of profitable operations is dependent upon future events, including obtaining adequate financing to complete the Company’s development activities, securing adequate supplier relationships, building its customer base, successfully executing its business and marketing strategy, and hiring and retaining appropriate personnel. Failure to generate sufficient revenues, achieve planned gross margins and operating profitability, control operating costs, or secure additional funding may require the Company to modify, delay or abandon some of its planned future expansion or development, or to otherwise enact operating cost reductions available to management, which could have a material adverse effect on the Company’s business, operating results and financial condition.

COVID-19

In March 2020, the World Health Organization declared the outbreak of the novel coronavirus disease (“COVID-19”) as a pandemic, adversely impacting global commercial activity and greatly disrupting supply chains and the manufacturing, delivery and installation of energy storage systems worldwide. As a result, we adjusted certain aspects of our operations to protect our employees and customers while still meeting customers’ needs for vital technology. Government and business responses to COVID-19, along with the rise of the COVID-19 Delta variant and resurgence of related disruptions, could have a continued material adverse impact on economic and market conditions and trigger a period of continued global economic slowdown. The continued uncertainty and fluidity of this situation precludes any predication as to the extent and the duration of the economic impact of government and business responses to COVID-19 and the Delta variant, and therefore present material uncertainty and risk with respect to the Company and its performance and could materially and adversely affect our business, financial condition, and results of operations.

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

6 Months Ended

Jun. 30, 2021

Accounting Policies [Abstract]

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Basis of Presentation

The accompanying unaudited consolidated financial statements of the Company have been prepared in accordance with GAAP for interim reporting and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, the condensed balance sheet at December 31, 2020 has been derived from the audited financial statements at that date, but certain notes or other information that are normally required by GAAP have been omitted if they substantially duplicate the disclosures contained in the Company’s annual audited consolidated financial statements. In the opinion of Stem management, all adjustments considered necessary for a fair statement of the results for the interim period presented have been included in the accompanying unaudited financial statements. The consolidated financial statements include the accounts of the Company, its wholly-owned subsidiaries, and consolidated variable interest entities (“VIEs”). All intercompany balances and transactions have been eliminated in consolidation. These unaudited condensed financial statements should be read in conjunction with the Company’s audited financial statements for the year ended December 31, 2020. Operating results three and for the six-month period ended June 30, 2021 are not necessarily indicative of the results that may be expected for the full year ending December 31, 2021 or for any other future year.

Use of Estimates

The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the consolidated financial statements, and the reported amounts of revenues and expenses during the reporting period. The Company bases its estimates on historical experience and on various other assumptions believed to be reasonable. Actual results could differ from those estimates and such differences could be material to the financial position and results of operations.

Significant estimates and assumptions reflected in these consolidated financial statements include, but are not limited to, depreciable life of energy systems; the amortization of financing obligations; deferred commissions and contract fulfillment costs; the valuation of energy storage systems, internally developed software, and asset retirement obligations; and the fair value of equity instruments, equity-based instruments, warrant liabilities and embedded derivatives.

Segment Information

Operating segments are defined as components of an entity for which discrete financial information is available that is regularly reviewed by the Chief Operating Decision Maker (“CODM”) in deciding how to allocate resources to an individual segment and in assessing performance. Our Chief Executive Officer is the CODM. The CODM reviews financial information presented on a consolidated basis for purposes of making operating decisions, allocating resources, and evaluating financial performance. As such, we have determined that the Company operates as one operating segment that is focused exclusively on innovative technology services that transform the way energy is distributed and consumed. Net assets outside of the U.S. were less than 10% of total net assets as of June 30, 2021 and December 31, 2020.

Significant Customers

A significant customer represents 10% or more of the Company’s total revenue or accounts receivable, net balance at each respective reporting date. For each significant customer, revenue as a percentage of total revenue and accounts receivable as a percentage of total accounts receivable are as follows:

	Accounts Receivable				Revenue			Revenue
	June 30,		December 31,		Three Months Ended June 30,			Six Months Ended June 30,
	2021		2020		2021		2020	2021		2020
Customers:
Customer A	10	%	30	%	27	%	*	15	%	*
Customer B	*		20	%	10	%	*	*		*
Customer C	17	%	17	%	*		*	*		*
Customer D	*		*		*		*	15	%	*
Customer E	*		*		*		*	*		12	%
Customer F	10	%	*		25	%	*	14	%	*
Customer G	16	%	*		*		*	*		*

*Total less than 10% for the respective period

Fair Value of Financial Instruments

Assets and liabilities recorded at fair value in the consolidated financial statements are categorized based upon the level of judgment associated with the inputs used to measure their fair value. The fair value of the Company’s financial assets and liabilities reflects management’s estimate of amounts that the Company would have received in connection with the sale of the assets or paid in connection with the transfer of the liabilities in an orderly transaction between market participants at the measurement date. In connection with measuring the fair value of its assets and liabilities, the Company seeks to maximize the use of observable inputs (market data obtained from independent sources) and to minimize the use of unobservable inputs (internal assumptions about how market participants would price assets and liabilities).

Hierarchical levels which are directly related to the amount of subjectivity associated with the inputs to the valuation of these assets or liabilities are as follows:

Level 1 — Unadjusted quoted prices in active markets for identical assets or liabilities that the Company has the ability to access as of the measurement date.

Level 2 — Inputs other than quoted prices included within Level 1 that are directly observable for the asset or liability or indirectly observable through corroboration with observable market data.

Level 3 — Unobservable inputs for the asset or liability only used when there is little, if any, market activity for the asset or liability at the measurement date.

This hierarchy requires the Company to use observable market data, when available, and to minimize the use of unobservable inputs when determining fair value. Assets and liabilities measured at fair value are classified in their entirety based on the lowest level of input that is significant to their fair value measurement. The Company’s assessment of the significance of a specific input to the fair value measurement in its entirety requires management to make judgments and consider factors specific to the asset or liability.

Financial assets and liabilities held by the Company measured at fair value on a recurring basis as of June 30, 2021 and December 31, 2020 include cash and cash equivalents and warrant liabilities.

Recently Adopted Accounting Standards

In August 2018, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework — Changes to the Disclosure Requirements for Fair Value Measurement. The amendments applicable to the Company on the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements and the narrative description of measurement uncertainty should be prospectively applied in the initial fiscal year of adoption. All other amendments applicable to the Company should be applied retrospectively to all periods presented upon their effective date. The Company adopted ASU 2018-13 as of January 1, 2020. The Company’s disclosures related to its level 3 financial instruments were not materially impacted for the periods presented. See Note 4, Fair Value Measurements, for more information.

In August 2018, the FASB issued ASU 2018-15, Intangibles — Goodwill and Other — Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract (“ASU 2018-15”). The intent of this pronouncement is to align the requirements for capitalizing implementation costs incurred in a cloud computing arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software as defined in ASC 350-40. Under ASU 2018-15, the capitalized implementation costs related to a cloud computing arrangement will be amortized over the term of the arrangement and all capitalized implementation amounts will be required to be presented in the same line items of the financial statements as the related hosting fees. ASU 2018-15 is effective for public and private companies’ fiscal years beginning after December 15, 2019, and December 15, 2020, respectively, and interim periods within those fiscal years, with early adoption permitted. The Company adopted ASU 2018-15 as of January 1, 2021. The adoption did not have a material impact to the Company’s condensed consolidated financial statements.

Recently Issued Accounting Standards

In June 2016, the FASB issued ASU 2016-13, Financial instruments — Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, and subsequent related ASUs, which amends the guidance on the impairment of financial instruments by requiring measurement and recognition of expected credit losses for financial assets held. This ASU is effective for public and private companies’ fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2019, and December 15, 2022, respectively. The Company expects to adopt ASU 2016-13 under the private company transition guidance beginning January 1, 2023 and is currently assessing the impact, if any, the guidance will have on the Company’s consolidated financial statements.

In December 2019, the FASB issued ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes (“ASU 2019-12”). ASU 2019-12 removes certain exceptions to the general principles in Topic 740 and also clarifies and amends existing guidance to improve consistent application. ASU 2019-12 will be effective for public entities for interim and annual periods beginning after December 15, 2020, with early adoption permitted. ASU 2019-12 will be effective for private entities for annual periods beginning after December 15, 2021, and interim periods beginning after December 15, 2020, with early adoption permitted. The Company plans to adopt ASU 2019-12 for the fiscal year beginning January 1, 2022 and is currently assessing the impact, if any, the guidance will have on the Company's consolidated financial statements.

In August 2020, the FASB issued ASU 2020-06, Debt — Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging — Contracts in Entity's Own Equity (Subtopic 815-40) — Accounting For Convertible Instruments and Contracts in an Entity's Own Equity. The ASU simplifies accounting for convertible instruments by removing major separation models required under current GAAP. Consequently, more convertible debt instruments will be reported as a single liability instrument with no separate accounting for embedded conversion features. The ASU removes certain settlement conditions that are required for equity contracts to qualify for the derivative scope exception, which will permit more equity contracts to qualify for it. The ASU also simplifies the diluted net income per share calculation in certain areas. The new guidance is effective for annual and interim periods beginning after December 15, 2023, and early adoption is permitted for fiscal years beginning after December 15, 2020, and interim periods within those fiscal years. The Company plans to adopt 2020-06 for the fiscal year beginning January 1, 2024 and is currently evaluating the impact that this new guidance will have on the Company's financial statements.

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REVENUE

6 Months Ended

Jun. 30, 2021

Revenue from Contract with Customer [Abstract]

REVENUE

REVENUE

The Company generates revenue through two types of arrangements with customers, host customer arrangements and partnership arrangements. The Company recognizes revenue under these arrangements as described below.

Host Customer Arrangements

Host customer contracts are generally entered into with commercial entities who have traditionally relied on power supplied directly from the grid. Host customer arrangements consist of a promise to provide energy optimization services through the Company’s proprietary SaaS platform coupled with a dedicated energy storage system owned and controlled by the Company throughout the term of the contract. The host customer does not obtain legal title to, or ownership of the dedicated energy storage system at any point in time. The host customer is the end consumer of the energy that directly benefits from the energy optimization services provided by the Company. The term for the Company’s contracts with host customers generally ranges from 5 to 10 years, which may include certain renewal options to extend the initial contract term or certain termination options to reduce the initial contract term.

Although the Company installs an energy storage system at the host customer site in order to provide the energy optimization services, the Company determined it has the right to direct how and for what purpose the asset is used through the operation of its SaaS platform and, as such, retains control of the energy storage system; therefore, the contract does not contain a lease. The Company determined the various energy optimization services provided throughout the term of the contract, which may include services such as remote monitoring, performance reporting, preventative maintenance and other ancillary services necessary for the safe and reliable operation of the energy storage system, are part of a combined output of energy optimization services and the Company provides a single distinct combined performance obligation representing a series of distinct days of services.

The Company determines the transaction price at the outset of the arrangement, primarily based on the contractual payment terms dictated by the contract with the customer. Fees charged to customers for energy optimization services generally consist of recurring fixed monthly payments throughout the term of the contract. In certain arrangements, the transaction price may include incentive payments that are earned by the host customer from utility companies in relation to the services provided by the Company. Under such arrangements, the rights to the incentive payments are assigned by the host customer to the Company. These incentives may be in the form of fixed upfront payments, variable monthly payments, or annual performance-based payments over the first five years of the customer contract term. Incentive payments may be contingent on approval from utility companies or actual future performance of the energy storage system.

Substantially all of the Company’s arrangements provide customers the unilateral ability to terminate for convenience prior to the conclusion of the stated contractual term or the contractual term is shorter than the estimated benefit period, which the Company has determined to be 10 years based on the estimated useful life of the underlying energy storage systems and the period over which the customer can benefit from the energy optimization services utilizing such energy storage systems. In these instances, the Company determined that upfront incentive payments received from its customers represent a material right that is, in effect, an advance payment for future energy optimization services to be recognized throughout the estimated benefit period. In contracts where the customer does not have the unilateral ability to terminate for convenience without a penalty during the estimated benefit period, the Company determined the upfront incentive payments do not represent a material right for services provided beyond the initial contractual period and are therefore a component of the initial transaction price. The Company revisits its estimate of the benefit period each reporting period. The Company’s contracts with host customers do not contain a significant financing component.

The Company transfers control of its energy optimization services to its customers continuously throughout the term of the contract (a stand-ready obligation) and revenue is recognized ratably as control of these services is transferred to its customers, in an amount that reflects the consideration the Company expects to be entitled to in exchange for its services. Monthly incentive payments based on the performance of the energy storage system are allocated to the distinct month in which they are earned because the terms of the payments relate specifically to the outcome from transferring the distinct time increment (month) of service and because such amounts reflect the fees to which the Company expects to be entitled for providing energy optimization services each period, consistent with the allocation objective. Annual variable performance- based payments are estimated at the inception in the transaction price using the expected value method, which takes into consideration historical experience, current contractual requirements, specific known market events and forecasted energy storage system performance patterns, and the Company recognizes such payments ratably using a time-based measure of progress of days elapsed over the term of the contract to the extent that it is probable that a significant reversal of the cumulative revenue recognized will not occur in a future period. At the end of each reporting period, the Company reassesses its estimate of the transaction price. The Company does not begin recognition of revenue until the energy storage system is live (i.e., provision of energy optimization services has commenced) or, as it relates to incentive payments, when approval has been received from the utility company if later.

Partnership Arrangements

Partnership arrangements consist of promises to transfer inventory in the form of an energy storage system to a solar plus storage project developer and separately provide energy optimization services as described previously to the ultimate owner of the project after the developer completes the installation of the project. Under partnership arrangements, the Company’s customer is the solar plus storage project developer. The customer obtains legal title to along with ownership and control of the inventory upon delivery and the customer is responsible for the installation of the project. Once installation of the project is complete, the owner of the solar plus storage project provides energy to the end consumer through a separate contractual arrangement directly with the end consumer. The term for the Company’s contracts with customers under partnership arrangements generally ranges from 10 to 20 years.

The Company determined the promise to deliver the inventory as a component of the solar plus storage project for which the customer is responsible to develop is a separate and distinct performance obligation from the promise to provide energy optimization services.

The Company determines the transaction price at the outset of the arrangement, primarily based on the contractual payment terms dictated by the contract with the customer. Fees charged for the sale of inventory generally consist of fixed fees payable upon or shortly after successful delivery to the customer. Fees charged to customers for energy optimization services consist of recurring fixed monthly payments throughout the term of the contract. The Company is responsible for designing, procuring, delivering and ensuring the proper components are provided in accordance with the requirements of the contract. Although the inventory is purchased by the Company from a third-party manufacturer, the Company determined it obtains control of the inventory prior to delivery to the customer and is the principal in the arrangement. The Company is fully responsible for responding to and correcting any customer issues related to the delivery of the inventory. The Company holds title and assumes all risks of loss associated with the inventory until the customer accepts the inventory. The Company is primarily responsible for fulfilling the delivery of the inventory to the customer, assumes substantial inventory risks and has discretion in the pricing charged to the customer. The Company has not entered into any partnership arrangements where it is not the principal in the transaction.

The Company allocates revenue between the hardware and energy storage services performance obligations based on the standalone selling price of each performance obligation. The standalone selling price for the hardware is established based on observable pricing. The standalone selling price for the energy optimization services is established using a residual value approach due to the significant variability in the services provided to each individual customer based on the specific requirements of each individual project and the lack of observable standalone sales of such services. The Company’s partnership arrangements do not contain a significant financing component.

The Company transfers control of the inventory upon delivery and simultaneous transfer of title to the customer. The Company transfers control of its energy optimization services to its customers continuously throughout the term of the contract (a stand-ready obligation), which does not commence until the customer successfully completes the installation of the project. As a result, the time frame between when the Company transfers control of the inventory to the customer upon delivery is generally several months, and can be in excess of one year, before the Company is required to perform any subsequent energy optimization services. Revenue is recognized ratably as control of these services is transferred to its customers based on a time-based output measure of progress of days elapsed over the term of the contract, in an amount that reflects the consideration the Company expects to be entitled to in exchange for its services.

In some partnership arrangements, the Company charges shipping fees for the inventory. The Company accounts for shipping as a fulfillment activity, since control transfers to the customer after the shipping is complete and includes such amounts within cost of revenue.

Disaggregation of Revenue

The following table provides information on the disaggregation of revenue as recorded in the consolidated statements of operations (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
Partnership hardware revenue	$	14,184	$	709	$	24,723	$	1,427
Partnership service revenue	42		—		79		—
Host customer service revenue	5,111		3,670		9,956		7,062
Total revenue	$	19,337	$	4,379	$	34,758	$	8,489

Remaining Performance Obligations

Remaining performance obligations represent contracted revenue that has not been recognized, which include contract liabilities (deferred revenue) and amounts that will be billed and recognized as revenue in future periods. As of June 30, 2021, the Company had $189.8 million of remaining performance obligations, and the approximate percentages expected to be recognized as revenue in the future are as follows (in thousands):

	Total remaining performance obligations		Percent Expected to be Recognized as Revenue
			Less than one year		Two to five years		Greater than five year
(in thousands, except percentages)
Service revenue	$	130,564	13	%	50	%	37	%
Hardware revenue	59,238		100	%	—	%	—	%
Total revenue	$	189,802

Contract Balances

Deferred revenue primarily includes cash received in advance of revenue recognition related to energy optimization services and incentives. The following table presents the changes in the deferred revenue balance during the six months ended June 30, 2021 (in thousands):

Beginning balance as of January 1, 2021	$	52,410
Upfront payments received from customers	25,146
Upfront or annual incentive payments received	2,959
Revenue recognized related to amounts that were included in beginning balance of deferred revenue	(19,457)
Revenue recognized related to deferred revenue generated during the period	(5,354)
Ending balance as of June 30, 2021	$	55,704

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FAIR VALUE MEASUREMENTS

6 Months Ended

Jun. 30, 2021

Fair Value Disclosures [Abstract]

FAIR VALUE MEASUREMENTS

FAIR VALUE MEASUREMENTS

Fair value accounting is applied for all financial assets and liabilities that are recognized or disclosed at fair value in the financial statements on a recurring basis. At June 30, 2021 and December 31, 2020, the carrying amount of accounts receivable, other current assets, other assets, accounts payable, and accrued and other current liabilities approximated their estimated fair value due to their relatively short maturities.

The following table provides the financial instruments measured at fair value (in thousands):

	June 30, 2021
	Level 1		Level 2		Level 3		Total
Assets
Cash equivalents:
Money market fund	$	225,795	$	—	$	—	$	225,795
Liabilities
Public warrant liability	$	303,798	$	—	$	—	$	303,798

	December 31, 2020
	Level 1		Level 2		Level 3		Total
Assets
Cash equivalents:
Money market fund	$	67	$	—	$	—	$	67
Liabilities
Convertible preferred stock warrant liability	$	—	$	—	$	95,342	$	95,342

The Company’s money market funds are classified as Level 1 because they are valued using quoted market prices. The convertible preferred stock warrant liabilities are defined as Level 3 in the fair value hierarchy as the valuations are based on significant unobservable inputs, which reflect the Company’s own assumptions incorporated in valuation techniques used to determine fair value; further discussion of these assumptions is set forth below. There were no transfers into or out of Level 3 of the fair value hierarchy during the periods presented.

Convertible Preferred Stock Warrant Liabilities

As discussed in Note 8, upon effectiveness of the Merger, substantially all of the outstanding convertible preferred stock warrants were converted into shares of Class A common stock of Stem. As such, the associated warrant liability was reclassified to additional paid-in-capital upon the Merger and was no longer an outstanding Level 3 financial instrument as of June 30, 2021. The fair value of the convertible preferred stock warrants as of June 30, 2020 was determined using the Black-Scholes method as well as a discount for lack of marketability. Black-Scholes inputs used to value the warrants are based on information from purchase agreements and within valuation reports prepared by an independent third party for the Company. Inputs include exercise price, volatility, fair value of common or preferred stock, expected dividend rate and risk-free interest rate.

The key assumptions used for the valuation of the preferred stock warrant liabilities upon remeasurement were as follows:

	Six Months Ended June 30,
	2020
Volatility	75.0	%
Risk-free interest rate	16.0	%
Expected term (in years)	2.0
Dividend yield	—	%
Discount for lack of marketability	19.3	%

The following table presents the changes in the liability for warrants on convertible preferred stock during the six months ended June 30, 2021 (in thousands):

	Convertible Warrant Stock Liability
Balance as of December 31, 2020	$	95,342
Changes in estimated fair value	133,577
Assumption of warrant liability upon Merger	303,221
Conversion of warrants upon Merger	(59,442)
Exchange of warrants	(168,647)
Exercised warrants	(253)
Balance as of June 30, 2021	$	303,798

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ENERGY STORAGE SYSTEMS, NET

6 Months Ended

Jun. 30, 2021

Property, Plant and Equipment [Abstract]

ENERGY STORAGE SYSTEMS, NET

ENERGY STORAGE SYSTEMS, NET

Energy Storage Systems, Net

Energy storage systems, net, consists of the following (in thousands):

	June 30, 2021
Energy storage systems placed into service	$	144,754
Less: accumulated depreciation	(39,848)
Energy storage systems not yet placed into service	13,310
Total energy storage systems, net	$	118,216

Depreciation expense for energy storage systems was approximately $3.6 million and $3.4 million within cost of service revenue for the three months ended June 30, 2021 and 2020, respectively, and approximately $7.3 million and $5.7 million within cost of service revenue for the six months ended June 30, 2021 and 2020, respectively.

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NOTES PAYABLE

6 Months Ended

Jun. 30, 2021

Debt Disclosure [Abstract]

NOTES PAYABLE

NOTES PAYABLE

Revolving Loan Due to SPE Member

In April 2017, the Company entered into a revolving loan agreement with an affiliate of a member of certain of the Company’s special purpose entities (“SPE”). This agreement was, from time to time, subsequently amended. The purpose of this revolving loan agreement was to finance the Company’s purchase of hardware for its various energy storage system projects. As of the beginning of 2020, the agreement had a total revolving loan capacity of $45.0 million that bore fixed interest at 10% with a maturity date of June 2020.

In May 2020, concurrent with the 2020 Credit Agreement discussed below, the Company entered into an amendment to the revolving loan agreement, which reduced the loan capacity to $35.0 million and extended the maturity date to May 2021. The amendment increased the fixed interest rate for any borrowings outstanding more than nine months to 14% thereafter. Additionally, under the original terms of the revolving loan agreement, the Company was able to finance 100% of the value of the hardware purchased up to the total loan capacity. The amendment reduced the advance rate to 85%, with an additional reduction to 70% in August 2020. The amendment was accounted for as a modification of the debt, which did not have a material impact on the condensed consolidated financial statements. As of December 31, 2020, the Company had $7.4 million outstanding under the revolving loan agreement. In April 2021, the Company repaid the remaining outstanding balance of this facility with the proceeds received from the Merger. The facility was terminated after the repayment in April 2021.

Term Loan Due to SPE Member

In December 2018, the Company entered into a term loan in the amount of $13.3 million with an affiliate of a member of certain SPEs with the Company. As of the beginning of 2020, the term loan bore fixed interest of 12.5% on the outstanding principal balance with a final balloon payment of $3.0 million due at the maturity date of June 30, 2020. In May 2020, the Company repaid the remaining outstanding balance of $5.9 million with the proceeds received through the 2020 Credit Agreement discussed below.

Term Loan Due to Former Non-Controlling Interest Holder

In June 2018, the Company acquired the outstanding member interests of an entity controlled by the Company for $8.1 million. The Company financed this acquisition by entering into a term loan agreement with the noncontrolling member bearing fixed interest of 4.5% per quarter (18.0% per annum) on the outstanding principal balance. The loan required fixed quarterly payments throughout the term of the loan, which was scheduled to be paid in full by April 1, 2026.

In May 2020, the Company amended the term loan and, using the proceeds from the 2020 Credit Agreement discussed below, prepaid $1.5 million of principal and interest on the note, of which $1.0 million was towards the outstanding principal balance, thereby reducing the fixed quarterly payment due to the lender. In relation to this amendment, the Company was required to issue warrants for 400,000 shares of common stock resulting in a discount to the term loan of $0.2 million. As of December 31, 2020, the outstanding balance was $5.8 million. In April 2021, the Company repaid the remaining outstanding balance of this facility with the proceeds received from the Merger. Upon prepayment of this facility, the Company incurred $2.6 million in prepayment penalties that were recorded to loss on extinguishment of debt in the Company’s statement of operations. The facility was terminated after the repayment in April 2021.

2020 Credit Agreement

In May 2020, the Company entered into a credit agreement (“2020 Credit Agreement”) with a new lender that provided the Company with proceeds of $25.0 million to provide the Company with access to working capital towards the purchase of energy storage system equipment. The 2020 Credit Agreement has a maturity date of the earlier of (1) May 2021, (2) the maturity date of the revolving loan agreement, or (3) the maturity date of the convertible promissory notes discussed below. The loan bore interest of 12% per annum, of which 8% was paid in cash and 4% added back to principal of the loan balance every quarter. The Company used a portion of the proceeds towards payments associated with existing debt as previously discussed. As of December 31, 2020, the outstanding balance was $25.6 million. In April 2021, the Company repaid the remaining outstanding balance of this facility with the proceeds received from the Merger. Upon prepayment of this facility, the Company incurred $1.4 million in prepayment penalties that were recorded to loss on extinguishment of debt in the Company’s statement of operations. The facility was terminated after the repayment in April 2021.

2021 Credit Agreement

In January 2021, the Company, through a wholly owned Canadian entity, entered into a credit agreement to provide a total of $2.7 million towards the financing of certain energy storage systems. The credit agreement is structured on a non-recourse basis and the system will be operated by the Company. The credit agreement has a stated interest of 5.45% and a maturity date of June 2031. The Company received an advance under the credit agreement of $1.8 million in January 2021. The repayment of advances received under this credit agreement is determined by the lender based on the proceeds generated by the Company through the operation of the underlying energy storage systems. As of June 30, 2021, and December 31, 2020, the outstanding balance was $1.8 million and zero, respectively. The Company was in compliance with all covenants associated with the 2021 Credit Agreement as of June 30, 2021.

The Company’s outstanding debt consisted of the following as of June 30, 2021 (in thousands):

	6/30/2021
Outstanding principal	$	1,951
Unamortized discount	(232)
Carrying value of debt	$	1,719

CONVERTIBLE PROMISSORY NOTES

As of December 31, 2020, the Company had various convertible notes outstanding to investors. The Company refers to the collective group of all such note instruments as the “Convertible Promissory Notes”. As of December 31, 2020, these Convertible Promissory Notes had a balance of $67.6 million. During the six months ended June 30, 2021, the Company issued additional Convertible Promissory Notes. The details of the convertible notes issued are set forth below. As of June 30, 2021, there were no Convertible Promissory Notes outstanding due to their conversion and cancellation upon the Merger.

Q1 2021 Convertible Notes

In January 2021, the Company issued and sold convertible promissory notes (the “Q1 2021 Convertible Notes”) under the same terms as the existing Convertible Promissory Notes to various investors with aggregate gross proceeds of $1.1 million. The Company evaluated the conversion option within the Q1 2021 Convertible Notes and determined the effective conversion price was beneficial to the note holders. As such, the Company recorded a beneficial conversion feature (“BCF”) related to the issuance of the Q1 2021 Convertible Notes based on the difference between the effective conversion rate and the fair value of the stock into which it was convertible, limited by the amount of the aggregate gross proceeds. The BCF resulted in a $1.1 million discount to the Q1 2021 Convertible Notes with an increase to additional paid in capital. The Company accreted the discount in connection with the BCF as interest expense over the term of the Q1 2021 Convertible Notes using the effective interest rate method.

Conversion and Cancellation of Convertible Promissory Notes Upon Merger

Immediately prior to the effectiveness of the Merger, the entire balance of the Company’s outstanding Convertible Promissory Notes issued by Legacy Stem automatically converted into shares of Legacy Stem Common Stock. Upon the effectiveness of the Merger, these shares of Legacy Stem Common Stock automatically converted into 10,921,548 shares of Class A common stock of Stem. The balance associated with the outstanding Convertible Promissory Notes totaling $77.7 million, including $7.7 million of interest accrued on the notes through the date of Merger, was reclassified to additional paid-in-capital. The unamortized portion of the debt discount associated with the outstanding Q1 2021 Convertible Notes totaling $1.1 million was fully expensed to loss on extinguishment of debt on the Company’s statement of operations.

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CONVERTIBLE PROMISSORY NOTES

6 Months Ended

Jun. 30, 2021

Debt Disclosure [Abstract]

CONVERTIBLE PROMISSORY NOTES

NOTES PAYABLE

Revolving Loan Due to SPE Member

In April 2017, the Company entered into a revolving loan agreement with an affiliate of a member of certain of the Company’s special purpose entities (“SPE”). This agreement was, from time to time, subsequently amended. The purpose of this revolving loan agreement was to finance the Company’s purchase of hardware for its various energy storage system projects. As of the beginning of 2020, the agreement had a total revolving loan capacity of $45.0 million that bore fixed interest at 10% with a maturity date of June 2020.

In May 2020, concurrent with the 2020 Credit Agreement discussed below, the Company entered into an amendment to the revolving loan agreement, which reduced the loan capacity to $35.0 million and extended the maturity date to May 2021. The amendment increased the fixed interest rate for any borrowings outstanding more than nine months to 14% thereafter. Additionally, under the original terms of the revolving loan agreement, the Company was able to finance 100% of the value of the hardware purchased up to the total loan capacity. The amendment reduced the advance rate to 85%, with an additional reduction to 70% in August 2020. The amendment was accounted for as a modification of the debt, which did not have a material impact on the condensed consolidated financial statements. As of December 31, 2020, the Company had $7.4 million outstanding under the revolving loan agreement. In April 2021, the Company repaid the remaining outstanding balance of this facility with the proceeds received from the Merger. The facility was terminated after the repayment in April 2021.

Term Loan Due to SPE Member

In December 2018, the Company entered into a term loan in the amount of $13.3 million with an affiliate of a member of certain SPEs with the Company. As of the beginning of 2020, the term loan bore fixed interest of 12.5% on the outstanding principal balance with a final balloon payment of $3.0 million due at the maturity date of June 30, 2020. In May 2020, the Company repaid the remaining outstanding balance of $5.9 million with the proceeds received through the 2020 Credit Agreement discussed below.

Term Loan Due to Former Non-Controlling Interest Holder

In June 2018, the Company acquired the outstanding member interests of an entity controlled by the Company for $8.1 million. The Company financed this acquisition by entering into a term loan agreement with the noncontrolling member bearing fixed interest of 4.5% per quarter (18.0% per annum) on the outstanding principal balance. The loan required fixed quarterly payments throughout the term of the loan, which was scheduled to be paid in full by April 1, 2026.

In May 2020, the Company amended the term loan and, using the proceeds from the 2020 Credit Agreement discussed below, prepaid $1.5 million of principal and interest on the note, of which $1.0 million was towards the outstanding principal balance, thereby reducing the fixed quarterly payment due to the lender. In relation to this amendment, the Company was required to issue warrants for 400,000 shares of common stock resulting in a discount to the term loan of $0.2 million. As of December 31, 2020, the outstanding balance was $5.8 million. In April 2021, the Company repaid the remaining outstanding balance of this facility with the proceeds received from the Merger. Upon prepayment of this facility, the Company incurred $2.6 million in prepayment penalties that were recorded to loss on extinguishment of debt in the Company’s statement of operations. The facility was terminated after the repayment in April 2021.

2020 Credit Agreement

In May 2020, the Company entered into a credit agreement (“2020 Credit Agreement”) with a new lender that provided the Company with proceeds of $25.0 million to provide the Company with access to working capital towards the purchase of energy storage system equipment. The 2020 Credit Agreement has a maturity date of the earlier of (1) May 2021, (2) the maturity date of the revolving loan agreement, or (3) the maturity date of the convertible promissory notes discussed below. The loan bore interest of 12% per annum, of which 8% was paid in cash and 4% added back to principal of the loan balance every quarter. The Company used a portion of the proceeds towards payments associated with existing debt as previously discussed. As of December 31, 2020, the outstanding balance was $25.6 million. In April 2021, the Company repaid the remaining outstanding balance of this facility with the proceeds received from the Merger. Upon prepayment of this facility, the Company incurred $1.4 million in prepayment penalties that were recorded to loss on extinguishment of debt in the Company’s statement of operations. The facility was terminated after the repayment in April 2021.

2021 Credit Agreement

In January 2021, the Company, through a wholly owned Canadian entity, entered into a credit agreement to provide a total of $2.7 million towards the financing of certain energy storage systems. The credit agreement is structured on a non-recourse basis and the system will be operated by the Company. The credit agreement has a stated interest of 5.45% and a maturity date of June 2031. The Company received an advance under the credit agreement of $1.8 million in January 2021. The repayment of advances received under this credit agreement is determined by the lender based on the proceeds generated by the Company through the operation of the underlying energy storage systems. As of June 30, 2021, and December 31, 2020, the outstanding balance was $1.8 million and zero, respectively. The Company was in compliance with all covenants associated with the 2021 Credit Agreement as of June 30, 2021.

The Company’s outstanding debt consisted of the following as of June 30, 2021 (in thousands):

	6/30/2021
Outstanding principal	$	1,951
Unamortized discount	(232)
Carrying value of debt	$	1,719

CONVERTIBLE PROMISSORY NOTES

As of December 31, 2020, the Company had various convertible notes outstanding to investors. The Company refers to the collective group of all such note instruments as the “Convertible Promissory Notes”. As of December 31, 2020, these Convertible Promissory Notes had a balance of $67.6 million. During the six months ended June 30, 2021, the Company issued additional Convertible Promissory Notes. The details of the convertible notes issued are set forth below. As of June 30, 2021, there were no Convertible Promissory Notes outstanding due to their conversion and cancellation upon the Merger.

Q1 2021 Convertible Notes

In January 2021, the Company issued and sold convertible promissory notes (the “Q1 2021 Convertible Notes”) under the same terms as the existing Convertible Promissory Notes to various investors with aggregate gross proceeds of $1.1 million. The Company evaluated the conversion option within the Q1 2021 Convertible Notes and determined the effective conversion price was beneficial to the note holders. As such, the Company recorded a beneficial conversion feature (“BCF”) related to the issuance of the Q1 2021 Convertible Notes based on the difference between the effective conversion rate and the fair value of the stock into which it was convertible, limited by the amount of the aggregate gross proceeds. The BCF resulted in a $1.1 million discount to the Q1 2021 Convertible Notes with an increase to additional paid in capital. The Company accreted the discount in connection with the BCF as interest expense over the term of the Q1 2021 Convertible Notes using the effective interest rate method.

Conversion and Cancellation of Convertible Promissory Notes Upon Merger

Immediately prior to the effectiveness of the Merger, the entire balance of the Company’s outstanding Convertible Promissory Notes issued by Legacy Stem automatically converted into shares of Legacy Stem Common Stock. Upon the effectiveness of the Merger, these shares of Legacy Stem Common Stock automatically converted into 10,921,548 shares of Class A common stock of Stem. The balance associated with the outstanding Convertible Promissory Notes totaling $77.7 million, including $7.7 million of interest accrued on the notes through the date of Merger, was reclassified to additional paid-in-capital. The unamortized portion of the debt discount associated with the outstanding Q1 2021 Convertible Notes totaling $1.1 million was fully expensed to loss on extinguishment of debt on the Company’s statement of operations.

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WARRANTS

6 Months Ended

Jun. 30, 2021

Equity [Abstract]

WARRANTS

WARRANTS

Legacy Stem Warrants

Since inception the Company has issued warrants to purchase shares of Legacy Stem’s preferred stock in conjunction with various debt financings. See Note 4 for further information regarding fair value measurements associated with the resulting warrant liabilities, which are remeasured on a recurring basis each period. The Company has also issued warrants to purchase shares of Legacy Stem’s common stock. Upon effectiveness of the Merger, the Company had 50,207,439 warrants outstanding, of which substantially all were converted into 2,759,970 shares of Class A common stock of Stem. Upon conversion of the warrants, the existing warrant liabilities were remeasured to fair value resulting in a gain on remeasurement of $100.9 million and a total warrant liability of $60.6 million, which was then reclassified to additional paid-in-capital. As of June 30, 2021, there were 23,634 Legacy Stem Warrants that remain outstanding. These instruments are exercisable into the Company’s Class A common stock and are equity classified.

Public Warrants and Private Placement Warrants

As part of STPK’s initial public offering on August 20, 2020, prior to the effectiveness of the Merger, STPK issued 12,786,168 warrants each of which entitles the holder to purchase one share of Class A common stock at an exercise price of $11.50 per share (the “Public Warrants”). Simultaneously with the closing of the IPO, STPK completed the private sale of 7,181,134 million warrants to STPK’s sponsor (the “Private Warrants”). Upon issuance, these warrants met the criteria for liability classification. Upon the effectiveness of the Merger, Stem assumed the outstanding Public Warrants and Private Warrants, which continued to meet the criteria for liability classification, resulting in assumed warrant liabilities of $185.9 million and $118.4 million, respectively, or a total warrant liability of $304.3 million.

On June 25, 2021, the Company entered into an exchange agreement (the “Exchange Agreement”) with the holders of the 7,181,134 outstanding Private Placement Warrants, pursuant to which such holders received 4,683,349 shares of the Company’s common stock on June 30, 2021, in exchange for the cancellation of the outstanding Private Placement Warrants. Immediately prior to the exchange, the Private Warrants were marked to fair value, resulting in a loss of $52.0 million. As a result of the Exchange Agreement, there were no Private Warrants outstanding as of June 30, 2021.

Warrants Issued for Services

On April 7, 2021, the Company entered into a strategic relationship with an existing shareholder not deemed to be a related party to jointly explore on a non-exclusive basis possible business opportunities to advance projects in the United States, United Kingdom, Europe and Asia. As consideration for the strategic relationship, upon closing of the Merger, the Company issued warrants to purchase 350,000 shares of the Company’s common stock at an exercise price of $0.01 per share. These warrants were deemed to have been fully earned as of the grant date. The warrants were valued at fair market value as of the grant date totaling $9.2 million and recorded to general and administrative expense in the Company’s statement of operations. In May 2021, these warrants were exercised for shares of the Company’s common stock.

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COMMON STOCK

6 Months Ended

Jun. 30, 2021

Equity [Abstract]

COMMON STOCK

COMMON STOCKThe Company had reserved shares of common stock for issuance as follows:

	June 30, 2021
Shares reserved for warrants	12,809,802
Options issued and outstanding	10,357,133
Shares available for future issuance under equity incentive plan	23,016,754
Total	46,183,689

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STOCK-BASED COMPENSATION

6 Months Ended

Jun. 30, 2021

Share-based Payment Arrangement [Abstract]

STOCK-BASED COMPENSATION

STOCK-BASED COMPENSATION

Under the Company’s 2009 Equity Incentive Plan (the “2009 Plan”), incentive stock options (ISOs), nonqualified stock options (NSOs), stock bonuses, and rights to acquire restricted stock are available for grant to employees, directors and consultants. At June 30, 2021, 9,647,780 stock options outstanding under the 2009 Plan and zero shares were available for future grant. In May 2021, the Company issued stock options under the Stem Inc 2021 Equity Incentive Plan (the “2021 Plan”), with 23,722,254 shares reserved thereunder.

Under both the 2009 Plan and the 2021 Plan (collectively, the “Plans”), the exercise price of an option cannot be less than 100% of the fair value of one share of common stock for incentive or non-qualified stock options, and not less than 110% of the fair value for stockholders owning greater than 10% of all classes of stock, as determined by the Company’s Board of Directors (the “Board”). Options under the Plans generally expire after 10 years. Under the Plans, the Compensation Committee of the Board determines when the options granted will become exercisable. Options granted under the Plans generally vest 1/4 one year from the grant date and then 1/48 each month over the following three years and are exercisable for 10 years from the date of the grant. The Plans allow for exercise of unvested options with repurchase rights over the restricted common stock issued at the original exercise price. The repurchase rights lapse at the same rate as the options vest.

A summary of activity under the Plans is as follows:

	Number of Options Outstanding	Weighted- Average Exercise Price Per Share		Weighted- Average Remaining Contractual Life (years)	Aggregate Intrinsic Value (in thousands)
Balances as of December 31, 2020	51,379,939	$	0.56	7.2	$	46,516
Retroactive application of recapitalization	(40,314,281)	2.05		—	—
Adjusted Balance as of December 31, 2020	11,065,658	2.61		7.2	46,516
Options granted	709,448	25.53
Options exercised	(1,402,538)	1.97
Options forfeited	(15,435)	2.25
Balances as of June 30, 2021	10,357,133	$	4.27	7.0	$	328,644
Options vested and exercisable — June 30, 2021	7,273,421	$	2.15	6.2	$	247,154

The weighted-average grant date fair value of stock options granted to employees was $16.84 during the six months ended June 30, 2021. There were 2,354,515 stock options granted during the six months ended June 30, 2020. The intrinsic value of options exercised was $47.6 million and less than $0.1 million during the six months ended June 30, 2021 and 2020, respectively.

Stock-Based Compensation

The following table summarizes stock-based compensation expense recorded in each component of operating expenses in the Company’s consolidated statements of operations and comprehensive loss (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
Sales and marketing	$	168	$	150	$	252	$	220
Research and development	264		301		419		486
General and administrative	592		25		1,113		226
Total stock-based compensation expense	$	1,024	$	476	$	1,784	$	932

As of June 30, 2021, the Company had approximately $17.9 million of remaining unrecognized stock-based compensation expense, which is expected to be recognized over a weighted average period of 3.6 years.

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NET LOSS PER SHARE

6 Months Ended

Jun. 30, 2021

Earnings Per Share [Abstract]

NET LOSS PER SHARE

NET LOSS PER SHARE

The following table sets forth the computation of basic and diluted net loss per share attributable to common stockholders (in thousands, except share and per share amounts):

	Three Months Ended June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
Numerator:
Net loss attributable to common stockholders	$	(100,216)	$	(18,981)	$	(182,769)	$	(36,452)
Less: Deemed dividend	—		—		—		(9,484)
	$	(100,216)	$	(18,981)	$	(182,769)	$	(45,936)
Denominator:
Weighted-average number of shares outstanding used to compute net loss per share attributable to common stockholders, basic and diluted	100,611,965		39,801,379		70,684,750		40,209,877
Net loss per share attributable to common stockholders, basic and diluted	$	(1.00)	$	(0.48)	$	(2.59)	$	(1.14)

The following potentially dilutive shares were not included in the calculation of diluted shares outstanding for the periods presented as the effect would have been anti-dilutive:

	June 30, 2021	June 30, 2020
Convertible promissory notes	—	7,473,946
Outstanding stock options	10,357,133	9,585,364
Outstanding warrants	12,809,802	9,842,181
Total	23,166,935	26,901,491

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INCOME TAXES	6 Months Ended
	Jun. 30, 2021
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXESThe Company did not record a provision or benefit for income taxes during the six months ended June 30, 2021 and 2020. The Company continues to maintain a full valuation allowance for its net U.S. federal and state deferred tax assets.

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COMMITMENTS AND CONTINGENCIES

6 Months Ended

Jun. 30, 2021

Commitments and Contingencies Disclosure [Abstract]

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES

Contingencies

The Company is party to various legal proceedings from time to time. A liability is accrued when a loss is both probable and can be reasonably estimated. Management believes that the probability of a material loss with respect to any currently pending legal proceeding is remote. However, litigation is inherently uncertain and it is not possible to definitively predict the ultimate disposition of any of these proceedings. The Company believes there is no current litigation pending or loss contingencies that could have, either individually or in the aggregate, a material adverse impact on the Company’s consolidated financial statements.

Commitments

In June 2021, the Company entered into a lease agreement for office space in San Francisco, California. The lease has a term of approximately 7.7 years and is expected to commence in the third quarter of 2021. Total lease payments are estimated to be $15.2 million over the lease term.

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SUBSEQUENT EVENTS	6 Months Ended
	Jun. 30, 2021
Subsequent Events [Abstract]
SUBSEQUENT EVENTS	SUBSEQUENT EVENTSManagement has evaluated subsequent events through August 11, 2021, the date the condensed consolidated financial statements were available for issuance, and has determined that there are no subsequent events that require disclosure.

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)

6 Months Ended

Jun. 30, 2021

Accounting Policies [Abstract]

Basis of Presentation

Basis of Presentation

The accompanying unaudited consolidated financial statements of the Company have been prepared in accordance with GAAP for interim reporting and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, the condensed balance sheet at December 31, 2020 has been derived from the audited financial statements at that date, but certain notes or other information that are normally required by GAAP have been omitted if they substantially duplicate the disclosures contained in the Company’s annual audited consolidated financial statements. In the opinion of Stem management, all adjustments considered necessary for a fair statement of the results for the interim period presented have been included in the accompanying unaudited financial statements. The consolidated financial statements include the accounts of the Company, its wholly-owned subsidiaries, and consolidated variable interest entities (“VIEs”). All intercompany balances and transactions have been eliminated in consolidation. These unaudited condensed financial statements should be read in conjunction with the Company’s audited financial statements for the year ended December 31, 2020. Operating results three and for the six-month period ended June 30, 2021 are not necessarily indicative of the results that may be expected for the full year ending December 31, 2021 or for any other future year.

Use of Estimates

Use of Estimates

The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the consolidated financial statements, and the reported amounts of revenues and expenses during the reporting period. The Company bases its estimates on historical experience and on various other assumptions believed to be reasonable. Actual results could differ from those estimates and such differences could be material to the financial position and results of operations.

Significant estimates and assumptions reflected in these consolidated financial statements include, but are not limited to, depreciable life of energy systems; the amortization of financing obligations; deferred commissions and contract fulfillment costs; the valuation of energy storage systems, internally developed software, and asset retirement obligations; and the fair value of equity instruments, equity-based instruments, warrant liabilities and embedded derivatives.

Segment Information

Segment InformationOperating segments are defined as components of an entity for which discrete financial information is available that is regularly reviewed by the Chief Operating Decision Maker (“CODM”) in deciding how to allocate resources to an individual segment and in assessing performance. Our Chief Executive Officer is the CODM. The CODM reviews financial information presented on a consolidated basis for purposes of making operating decisions, allocating resources, and evaluating financial performance. As such, we have determined that the Company operates as one operating segment that is focused exclusively on innovative technology services that transform the way energy is distributed and consumed.

Significant Customers

Significant CustomersA significant customer represents 10% or more of the Company’s total revenue or accounts receivable, net balance at each respective reporting date.

Fair Value of Financial Instruments

Fair Value of Financial Instruments

Assets and liabilities recorded at fair value in the consolidated financial statements are categorized based upon the level of judgment associated with the inputs used to measure their fair value. The fair value of the Company’s financial assets and liabilities reflects management’s estimate of amounts that the Company would have received in connection with the sale of the assets or paid in connection with the transfer of the liabilities in an orderly transaction between market participants at the measurement date. In connection with measuring the fair value of its assets and liabilities, the Company seeks to maximize the use of observable inputs (market data obtained from independent sources) and to minimize the use of unobservable inputs (internal assumptions about how market participants would price assets and liabilities).

Hierarchical levels which are directly related to the amount of subjectivity associated with the inputs to the valuation of these assets or liabilities are as follows:

Level 1 — Unadjusted quoted prices in active markets for identical assets or liabilities that the Company has the ability to access as of the measurement date.

Level 2 — Inputs other than quoted prices included within Level 1 that are directly observable for the asset or liability or indirectly observable through corroboration with observable market data.

Level 3 — Unobservable inputs for the asset or liability only used when there is little, if any, market activity for the asset or liability at the measurement date.

This hierarchy requires the Company to use observable market data, when available, and to minimize the use of unobservable inputs when determining fair value. Assets and liabilities measured at fair value are classified in their entirety based on the lowest level of input that is significant to their fair value measurement. The Company’s assessment of the significance of a specific input to the fair value measurement in its entirety requires management to make judgments and consider factors specific to the asset or liability.

Recently Adopted Accounting Standards And Recently Issued Accounting Standards

Recently Adopted Accounting Standards

In August 2018, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework — Changes to the Disclosure Requirements for Fair Value Measurement. The amendments applicable to the Company on the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements and the narrative description of measurement uncertainty should be prospectively applied in the initial fiscal year of adoption. All other amendments applicable to the Company should be applied retrospectively to all periods presented upon their effective date. The Company adopted ASU 2018-13 as of January 1, 2020. The Company’s disclosures related to its level 3 financial instruments were not materially impacted for the periods presented. See Note 4, Fair Value Measurements, for more information.

In August 2018, the FASB issued ASU 2018-15, Intangibles — Goodwill and Other — Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract (“ASU 2018-15”). The intent of this pronouncement is to align the requirements for capitalizing implementation costs incurred in a cloud computing arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software as defined in ASC 350-40. Under ASU 2018-15, the capitalized implementation costs related to a cloud computing arrangement will be amortized over the term of the arrangement and all capitalized implementation amounts will be required to be presented in the same line items of the financial statements as the related hosting fees. ASU 2018-15 is effective for public and private companies’ fiscal years beginning after December 15, 2019, and December 15, 2020, respectively, and interim periods within those fiscal years, with early adoption permitted. The Company adopted ASU 2018-15 as of January 1, 2021. The adoption did not have a material impact to the Company’s condensed consolidated financial statements.

Recently Issued Accounting Standards

In June 2016, the FASB issued ASU 2016-13, Financial instruments — Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, and subsequent related ASUs, which amends the guidance on the impairment of financial instruments by requiring measurement and recognition of expected credit losses for financial assets held. This ASU is effective for public and private companies’ fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2019, and December 15, 2022, respectively. The Company expects to adopt ASU 2016-13 under the private company transition guidance beginning January 1, 2023 and is currently assessing the impact, if any, the guidance will have on the Company’s consolidated financial statements.

In December 2019, the FASB issued ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes (“ASU 2019-12”). ASU 2019-12 removes certain exceptions to the general principles in Topic 740 and also clarifies and amends existing guidance to improve consistent application. ASU 2019-12 will be effective for public entities for interim and annual periods beginning after December 15, 2020, with early adoption permitted. ASU 2019-12 will be effective for private entities for annual periods beginning after December 15, 2021, and interim periods beginning after December 15, 2020, with early adoption permitted. The Company plans to adopt ASU 2019-12 for the fiscal year beginning January 1, 2022 and is currently assessing the impact, if any, the guidance will have on the Company's consolidated financial statements.

In August 2020, the FASB issued ASU 2020-06, Debt — Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging — Contracts in Entity's Own Equity (Subtopic 815-40) — Accounting For Convertible Instruments and Contracts in an Entity's Own Equity. The ASU simplifies accounting for convertible instruments by removing major separation models required under current GAAP. Consequently, more convertible debt instruments will be reported as a single liability instrument with no separate accounting for embedded conversion features. The ASU removes certain settlement conditions that are required for equity contracts to qualify for the derivative scope exception, which will permit more equity contracts to qualify for it. The ASU also simplifies the diluted net income per share calculation in certain areas. The new guidance is effective for annual and interim periods beginning after December 15, 2023, and early adoption is permitted for fiscal years beginning after December 15, 2020, and interim periods within those fiscal years. The Company plans to adopt 2020-06 for the fiscal year beginning January 1, 2024 and is currently evaluating the impact that this new guidance will have on the Company's financial statements.

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BUSINESS (Tables)

6 Months Ended

Jun. 30, 2021

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule Of Reverse Recapitalization

On April 28, 2021, shareholders of STPK approved the Merger, under which Stem received approximately $550.3 million, net of fees and expenses as follows:

	Recapitalization
Cash — STPK trust and working capital cash	$	383,383
Cash — PIPE	225,000
Less: transaction costs and advisory fees paid	(58,061)
Merger and PIPE financing	$	550,322

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

6 Months Ended

Jun. 30, 2021

Accounting Policies [Abstract]

Significant Customers

For each significant customer, revenue as a percentage of total revenue and accounts receivable as a percentage of total accounts receivable are as follows:

	Accounts Receivable				Revenue			Revenue
	June 30,		December 31,		Three Months Ended June 30,			Six Months Ended June 30,
	2021		2020		2021		2020	2021		2020
Customers:
Customer A	10	%	30	%	27	%	*	15	%	*
Customer B	*		20	%	10	%	*	*		*
Customer C	17	%	17	%	*		*	*		*
Customer D	*		*		*		*	15	%	*
Customer E	*		*		*		*	*		12	%
Customer F	10	%	*		25	%	*	14	%	*
Customer G	16	%	*		*		*	*		*

*Total less than 10% for the respective period

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REVENUE (Tables)

6 Months Ended

Jun. 30, 2021

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

The following table provides information on the disaggregation of revenue as recorded in the consolidated statements of operations (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
Partnership hardware revenue	$	14,184	$	709	$	24,723	$	1,427
Partnership service revenue	42		—		79		—
Host customer service revenue	5,111		3,670		9,956		7,062
Total revenue	$	19,337	$	4,379	$	34,758	$	8,489

Remaining Performance Obligations

As of June 30, 2021, the Company had $189.8 million of remaining performance obligations, and the approximate percentages expected to be recognized as revenue in the future are as follows (in thousands):

	Total remaining performance obligations		Percent Expected to be Recognized as Revenue
			Less than one year		Two to five years		Greater than five year
(in thousands, except percentages)
Service revenue	$	130,564	13	%	50	%	37	%
Hardware revenue	59,238		100	%	—	%	—	%
Total revenue	$	189,802

Contract Balances

The following table presents the changes in the deferred revenue balance during the six months ended June 30, 2021 (in thousands):

Beginning balance as of January 1, 2021	$	52,410
Upfront payments received from customers	25,146
Upfront or annual incentive payments received	2,959
Revenue recognized related to amounts that were included in beginning balance of deferred revenue	(19,457)
Revenue recognized related to deferred revenue generated during the period	(5,354)
Ending balance as of June 30, 2021	$	55,704

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FAIR VALUE MEASUREMENTS (Tables)

6 Months Ended

Jun. 30, 2021

Fair Value Disclosures [Abstract]

Schedule of Financial Instruments Measured at Fair Value

The following table provides the financial instruments measured at fair value (in thousands):

	June 30, 2021
	Level 1		Level 2		Level 3		Total
Assets
Cash equivalents:
Money market fund	$	225,795	$	—	$	—	$	225,795
Liabilities
Public warrant liability	$	303,798	$	—	$	—	$	303,798

	December 31, 2020
	Level 1		Level 2		Level 3		Total
Assets
Cash equivalents:
Money market fund	$	67	$	—	$	—	$	67
Liabilities
Convertible preferred stock warrant liability	$	—	$	—	$	95,342	$	95,342

Key Assumptions Used for Valuation

The key assumptions used for the valuation of the preferred stock warrant liabilities upon remeasurement were as follows:

	Six Months Ended June 30,
	2020
Volatility	75.0	%
Risk-free interest rate	16.0	%
Expected term (in years)	2.0
Dividend yield	—	%
Discount for lack of marketability	19.3	%

Schedule of Changes in Liability for Unobservable Inputs

The following table presents the changes in the liability for warrants on convertible preferred stock during the six months ended June 30, 2021 (in thousands):

	Convertible Warrant Stock Liability
Balance as of December 31, 2020	$	95,342
Changes in estimated fair value	133,577
Assumption of warrant liability upon Merger	303,221
Conversion of warrants upon Merger	(59,442)
Exchange of warrants	(168,647)
Exercised warrants	(253)
Balance as of June 30, 2021	$	303,798

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ENERGY STORAGE SYSTEMS, NET (Tables)

6 Months Ended

Jun. 30, 2021

Property, Plant and Equipment [Abstract]

Schedule of Energy Storage Systems, Net

Energy storage systems, net, consists of the following (in thousands):

	June 30, 2021
Energy storage systems placed into service	$	144,754
Less: accumulated depreciation	(39,848)
Energy storage systems not yet placed into service	13,310
Total energy storage systems, net	$	118,216

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NOTES PAYABLE (Tables)

6 Months Ended

Jun. 30, 2021

Debt Disclosure [Abstract]

Schedule of Outstanding Debt

The Company’s outstanding debt consisted of the following as of June 30, 2021 (in thousands):

	6/30/2021
Outstanding principal	$	1,951
Unamortized discount	(232)
Carrying value of debt	$	1,719

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COMMON STOCK (Tables)

6 Months Ended

Jun. 30, 2021

Equity [Abstract]

Common Stock Reserved For Issuance

The Company had reserved shares of common stock for issuance as follows:

	June 30, 2021
Shares reserved for warrants	12,809,802
Options issued and outstanding	10,357,133
Shares available for future issuance under equity incentive plan	23,016,754
Total	46,183,689

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STOCK-BASED COMPENSATION (Tables)

6 Months Ended

Jun. 30, 2021

Share-based Payment Arrangement [Abstract]

Summary of Activity Under the Plan

A summary of activity under the Plans is as follows:

	Number of Options Outstanding	Weighted- Average Exercise Price Per Share		Weighted- Average Remaining Contractual Life (years)	Aggregate Intrinsic Value (in thousands)
Balances as of December 31, 2020	51,379,939	$	0.56	7.2	$	46,516
Retroactive application of recapitalization	(40,314,281)	2.05		—	—
Adjusted Balance as of December 31, 2020	11,065,658	2.61		7.2	46,516
Options granted	709,448	25.53
Options exercised	(1,402,538)	1.97
Options forfeited	(15,435)	2.25
Balances as of June 30, 2021	10,357,133	$	4.27	7.0	$	328,644
Options vested and exercisable — June 30, 2021	7,273,421	$	2.15	6.2	$	247,154

Stock-based Compensation Expense

The following table summarizes stock-based compensation expense recorded in each component of operating expenses in the Company’s consolidated statements of operations and comprehensive loss (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
Sales and marketing	$	168	$	150	$	252	$	220
Research and development	264		301		419		486
General and administrative	592		25		1,113		226
Total stock-based compensation expense	$	1,024	$	476	$	1,784	$	932

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NET LOSS PER SHARE (Tables)

6 Months Ended

Jun. 30, 2021

Earnings Per Share [Abstract]

Schedule of Computation of Basic and Diluted Net Loss Per Share

The following table sets forth the computation of basic and diluted net loss per share attributable to common stockholders (in thousands, except share and per share amounts):

	Three Months Ended June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
Numerator:
Net loss attributable to common stockholders	$	(100,216)	$	(18,981)	$	(182,769)	$	(36,452)
Less: Deemed dividend	—		—		—		(9,484)
	$	(100,216)	$	(18,981)	$	(182,769)	$	(45,936)
Denominator:
Weighted-average number of shares outstanding used to compute net loss per share attributable to common stockholders, basic and diluted	100,611,965		39,801,379		70,684,750		40,209,877
Net loss per share attributable to common stockholders, basic and diluted	$	(1.00)	$	(0.48)	$	(2.59)	$	(1.14)

Schedule of Potentially Dilutive Shares

The following potentially dilutive shares were not included in the calculation of diluted shares outstanding for the periods presented as the effect would have been anti-dilutive:

	June 30, 2021	June 30, 2020
Convertible promissory notes	—	7,473,946
Outstanding stock options	10,357,133	9,585,364
Outstanding warrants	12,809,802	9,842,181
Total	23,166,935	26,901,491

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BUSINESS - Narrative (Details) $ / shares in Units, $ in Thousands		3 Months Ended				6 Months Ended
	Apr. 28, 2021 USD ($) $ / shares	Jun. 30, 2021 USD ($) $ / shares	Mar. 31, 2021 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Jun. 30, 2021 USD ($) $ / shares shares	Jun. 30, 2020 USD ($)	Apr. 27, 2021 $ / shares	Dec. 31, 2020 USD ($) $ / shares
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Proceeds received	$ 550,300					$ 550,322
Preferred stock, par value (in dollars per share) | $ / shares		$ 0.0001				$ 0.0001		$ 0.00001	$ 0.0001
Common stock, par value (in dollars per share) | $ / shares		$ 0.0001				$ 0.0001		$ 0.000001	$ 0.0001
Exchange ratio	4.6432
Sale of stock, number of shares Issued in transaction (in shares) | shares						22,500,000
Sale of stock (in dollars per share) | $ / shares	$ 10
Sale of stock aggregate purchase price						$ 225,000
Net liabilities	$ 304,000
Liquidity And Going Concern [Abstract]
Cash and cash equivalents		$ 474,138				474,138			$ 6,942
Accumulated deficit		590,610				590,610			$ 407,841
Working capital		452,500				452,500
Debt financing coming due within the next 12 months		15,300				15,300
Net loss		$ 100,216	$ 82,553	$ 18,981	$ 17,471	182,769	$ 36,452
Negative cash flows from operating activities						$ 41,833	$ 16,497

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BUSINESS - Schedule of Reverse Recapitalization (Details) - USD ($) $ in Thousands		6 Months Ended
	Apr. 28, 2021	Jun. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Cash — STPK trust and working capital cash		$ 383,383
Cash — PIPE		225,000
Less: transaction costs and advisory fees paid		(58,061)
Merger and PIPE financing	$ 550,300	$ 550,322

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - segment	3 Months Ended	6 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Concentration Risk [Line Items]
Number of operating segments		1
Accounts Receivable | Customer Concentration Risk | Customer A
Concentration Risk [Line Items]
Concentration risk, percentage		10.00%		30.00%
Accounts Receivable | Customer Concentration Risk | Customer B
Concentration Risk [Line Items]
Concentration risk, percentage				20.00%
Accounts Receivable | Customer Concentration Risk | Customer C
Concentration Risk [Line Items]
Concentration risk, percentage		17.00%		17.00%
Accounts Receivable | Customer Concentration Risk | Customer F
Concentration Risk [Line Items]
Concentration risk, percentage		10.00%
Accounts Receivable | Customer Concentration Risk | Customer G
Concentration Risk [Line Items]
Concentration risk, percentage		16.00%
Revenue | Customer Concentration Risk | Customer A
Concentration Risk [Line Items]
Concentration risk, percentage	27.00%	15.00%
Revenue | Customer Concentration Risk | Customer B
Concentration Risk [Line Items]
Concentration risk, percentage	10.00%
Revenue | Customer Concentration Risk | Customer D
Concentration Risk [Line Items]
Concentration risk, percentage		15.00%
Revenue | Customer Concentration Risk | Customer E
Concentration Risk [Line Items]
Concentration risk, percentage			12.00%
Revenue | Customer Concentration Risk | Customer F
Concentration Risk [Line Items]
Concentration risk, percentage	25.00%	14.00%

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REVENUE - Narrative (Details)	6 Months Ended
	Jun. 30, 2021 segment
Disaggregation of Revenue [Line Items]
Number of types or revenue arrangements	2
Host Customer Arrangements
Disaggregation of Revenue [Line Items]
Incentive period	5 years
Estimated benefit period	10 years
Host Customer Arrangements | Minimum
Disaggregation of Revenue [Line Items]
Contract term	5 years
Host Customer Arrangements | Maximum
Disaggregation of Revenue [Line Items]
Contract term	10 years
Partnership Arrangements | Minimum
Disaggregation of Revenue [Line Items]
Contract term	10 years
Partnership Arrangements | Maximum
Disaggregation of Revenue [Line Items]
Contract term	20 years
Transfers control of inventory period	1 year

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REVENUE - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Revenue	$ 19,337	$ 4,379	$ 34,758	$ 8,489
Hardware
Disaggregation of Revenue [Line Items]
Revenue	14,184	709	24,723	1,427
Hardware | Partnership Arrangements
Disaggregation of Revenue [Line Items]
Revenue	14,184	709	24,723	1,427
Service
Disaggregation of Revenue [Line Items]
Revenue	5,153	3,670	10,035	7,062
Service | Partnership Arrangements
Disaggregation of Revenue [Line Items]
Revenue	42	0	79	0
Service | Host Customer Arrangements
Disaggregation of Revenue [Line Items]
Revenue	$ 5,111	$ 3,670	$ 9,956	$ 7,062

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REVENUE - Remaining Performance Obligations (Details) $ in Thousands	Jun. 30, 2021 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligations	$ 189,802
Service
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligations	130,564
Hardware
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligations	$ 59,238
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01 | Service
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Percent Expected to be Recognized as Revenue	13.00%
Period expected to be recognized as revenue	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01 | Hardware
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Percent Expected to be Recognized as Revenue	100.00%
Period expected to be recognized as revenue	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-07-01 | Service
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Percent Expected to be Recognized as Revenue	50.00%
Period expected to be recognized as revenue	4 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-07-01 | Hardware
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Percent Expected to be Recognized as Revenue	0.00%
Period expected to be recognized as revenue	4 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-07-01 | Service
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Percent Expected to be Recognized as Revenue	37.00%
Period expected to be recognized as revenue
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-07-01 | Hardware
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Percent Expected to be Recognized as Revenue	0.00%
Period expected to be recognized as revenue

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REVENUE - Contract Balances (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2021 USD ($)
Contract With Customer, Liability [Roll Forward]
Beginning balance	$ 52,410
Upfront payments received from customers	25,146
Upfront or annual incentive payments received	2,959
Revenue recognized related to amounts that were included in beginning balance of deferred revenue	(19,457)
Revenue recognized related to deferred revenue generated during the period	(5,354)
Ending balance	$ 55,704

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FAIR VALUE MEASUREMENTS - Schedule of Financial Instruments Measured at Fair Value (Details) - Fair Value, Recurring - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Public Warrants
Liabilities
Warrant liability	$ 303,798
Convertible Preferred Stock Warrant
Liabilities
Warrant liability		$ 95,342
Money market fund
Assets
Cash equivalents	225,795	67
Level 1 | Public Warrants
Liabilities
Warrant liability	303,798
Level 1 | Convertible Preferred Stock Warrant
Liabilities
Warrant liability		0
Level 1 | Money market fund
Assets
Cash equivalents	225,795	67
Level 2 | Public Warrants
Liabilities
Warrant liability	0
Level 2 | Convertible Preferred Stock Warrant
Liabilities
Warrant liability		0
Level 2 | Money market fund
Assets
Cash equivalents	0	0
Level 3 | Public Warrants
Liabilities
Warrant liability	0
Level 3 | Convertible Preferred Stock Warrant
Liabilities
Warrant liability		95,342
Level 3 | Money market fund
Assets
Cash equivalents	$ 0	$ 0

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FAIR VALUE MEASUREMENTS - Key Assumptions Used for Valuation (Details)	Jun. 30, 2020
Volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.750
Risk-free interest rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.160
Expected term (in years)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	2.0
Dividend yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0
Discount for lack of marketability
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.193

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FAIR VALUE MEASUREMENTS - Schedule of Changes in Liability for Unobservable Inputs (Details) - Convertible warrant stock liability $ in Thousands	6 Months Ended
	Jun. 30, 2021 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Beginning balance	$ 95,342
Changes in estimated fair value	133,577
Assumption of warrant liability upon Merger	303,221
Conversion of warrants upon Merger	(59,442)
Exchange of warrants	(168,647)
Exercised warrants	(253)
Ending balance	$ 303,798

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ENERGY STORAGE SYSTEMS, NET - Schedule of Energy Storage Systems, Net (Details) $ in Thousands	Jun. 30, 2021 USD ($)
Property, Plant and Equipment [Line Items]
Less: accumulated depreciation	$ (39,848)
Total energy storage systems, net	118,216
Energy storage systems placed into service
Property, Plant and Equipment [Line Items]
Total energy storage systems, gross	144,754
Energy storage systems not yet placed into service
Property, Plant and Equipment [Line Items]
Total energy storage systems, gross	$ 13,310

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ENERGY STORAGE SYSTEMS, NET - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 3.6	$ 3.4	$ 7.3	$ 5.7

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NOTES PAYABLE - Revolving Loan Due to SPE Member (Details) - Line of Credit - Revolving Loan Due To SPE Member - USD ($) $ in Millions	1 Months Ended
	Aug. 31, 2020	May 31, 2020	Apr. 30, 2017	Dec. 31, 2020
Debt Instrument [Line Items]
Total capacity		$ 35.0	$ 45.0
Fixed interest rate, annual			10.00%
Percent of capacity usage for financing of hardware purchases	0.70%	0.85%	1.00%
Outstanding balance				$ 7.4
Debt Terms, One
Debt Instrument [Line Items]
Fixed interest rate, annual		14.00%
Period threshold for interest rate		9 months

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NOTES PAYABLE - Term Loan Due to SPE Member (Details) - Term Loan Due To SPE Member - Term Loan - USD ($) $ in Millions	1 Months Ended
	May 31, 2020	Jan. 01, 2020	Dec. 31, 2018
Debt Instrument [Line Items]
Face amount			$ 13.3
Fixed interest rate, annual		12.50%
Final balloon payment		$ 3.0
Repayment of debt	$ 5.9

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NOTES PAYABLE - Term Loan Due to Former Non-Controlling Interest Holder (Details) - USD ($) $ in Millions	1 Months Ended		6 Months Ended
	May 31, 2020	Jun. 30, 2018	Jun. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Payment to acquire noncontrolling interest		$ 8.1
Term Loan Due To Former Non-Controlling Interest Holder | Term Loan
Debt Instrument [Line Items]
Fixed interest rate, quarterly		4500.00%
Fixed interest rate, annual		18.00%
Prepaid principal and interest	$ 1.5
Prepaid principal	$ 1.0
Warrants issued (in shares)	400,000
Unamortized discount	$ 0.2
Outstanding balance				$ 5.8
Debt instrument, prepayment penalties			$ 2.6

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NOTES PAYABLE - 2020 and 2021 Credit Agreements (Details) - Line of Credit - USD ($) $ in Thousands	1 Months Ended
	Apr. 30, 2021	Jan. 31, 2021	May 31, 2020	Jun. 30, 2021	Dec. 31, 2020
2020 Credit Agreement
Debt Instrument [Line Items]
Proceeds from credit agreement			$ 25,000
Fixed interest rate, annual			12.00%
Fixed interest rate, paid in cash			8.00%
Fixed interest rate, added back to principal			4.00%
Outstanding balance					$ 25,600
Prepayment penalties	$ 1,400
2021 Credit Agreement
Debt Instrument [Line Items]
Proceeds from credit agreement		$ 1,800
Fixed interest rate, annual		5.45%
Outstanding balance				$ 1,800	$ 0
Total capacity		$ 2,700

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NOTES PAYABLE - Schedule of Outstanding Debt (Details) - Notes Payable $ in Thousands	Jun. 30, 2021 USD ($)
Debt Instrument [Line Items]
Outstanding principal	$ 1,951
Unamortized discount	(232)
Carrying value of debt	$ 1,719

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CONVERTIBLE PROMISSORY NOTES (Details) - USD ($) $ in Thousands	1 Months Ended	6 Months Ended
	Jan. 31, 2021	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Debt Instrument [Line Items]
Proceeds from convertible notes		$ 1,118	$ 14,050
Debt conversion, converted instrument, shares issued (in shares)		10,921,548
Convertible Notes
Debt Instrument [Line Items]
Convertible notes payable		$ 0		$ 67,600
Convertible Notes | Q1 2021 Convertible Notes
Debt Instrument [Line Items]
Proceeds from convertible notes	$ 1,100
Unamortized discount	$ 1,100
Convertible Notes | Convertible Promissory Notes
Debt Instrument [Line Items]
Debt conversion, converted instrument, amount		77,700
Debt instrument, increase, accrued interest		7,700
Outstanding principal		$ 1,100

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WARRANTS (Details) - USD ($) $ / shares in Units, $ in Thousands				3 Months Ended		6 Months Ended
	Apr. 28, 2021	Apr. 07, 2021	Aug. 20, 2020	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Jul. 25, 2021
Class of Warrant or Right [Line Items]
Warrants outstanding (in shares)	50,207,439
Conversion of securities into common stock (in shares)	2,759,970
Loss from fair value adjustment	$ 100,900			$ (67,179)	$ (1,918)	$ (133,577)	$ (909)
Conversion of securities into common stock	$ 60,600
Sale of stock, number of shares Issued in transaction (in shares)						22,500,000
Number of shares called from each warrant (in shares)			1
Exercise Price (in dollars per share)		$ 0.01
Number of shares called from exchange of warrants (in shares)		350,000
Warrants and rights outstanding				304,300		$ 304,300
Issuance of common stock warrants for services (Note 8)		$ 9,200		$ 9,183
Legacy Stem Warrants
Class of Warrant or Right [Line Items]
Warrants outstanding (in shares)				23,634		23,634
Public Warrants
Class of Warrant or Right [Line Items]
Sale of stock, number of shares Issued in transaction (in shares)			12,786,168
Exercise Price (in dollars per share)			$ 11.50
Warrants and rights outstanding				$ 185,900		$ 185,900
Private Warrants
Class of Warrant or Right [Line Items]
Warrants outstanding (in shares)				0		0
Loss from fair value adjustment						$ 52,000
Number of shares called from exchange of warrants (in shares)				7,181,134		7,181,134
Warrants and rights outstanding				$ 118,400		$ 118,400
Private Warrants | Subsequent Event
Class of Warrant or Right [Line Items]
Warrants outstanding (in shares)								7,181,134
Number of shares called from exchange of warrants (in shares)								4,683,349

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COMMON STOCK - Schedule of Shares Reserved for Issuance (Details)	Jun. 30, 2021 shares
Class of Stock [Line Items]
Reserved shares of common stock for issuance ( in shares)	46,183,689
Shares reserved for warrants
Class of Stock [Line Items]
Reserved shares of common stock for issuance ( in shares)	12,809,802
Options issued and outstanding
Class of Stock [Line Items]
Reserved shares of common stock for issuance ( in shares)	10,357,133
Shares available for future issuance under equity incentive plan
Class of Stock [Line Items]
Reserved shares of common stock for issuance ( in shares)	23,016,754

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STOCK-BASED COMPENSATION - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	May 31, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding	10,357,133			11,065,658
Reserved shares of common stock for issuance ( in shares)	46,183,689
Options granted, weighted-average grant date fair value (in dollars per share)	$ 16.84
Options granted (in shares)	709,448	2,354,515
Options exercised, intrinsic value	$ 47.6	$ 0.1
Remaining unrecognized stock-based compensation expense	$ 17.9
2009 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding	9,647,780
Reserved shares of common stock for issuance ( in shares)	0
2021 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reserved shares of common stock for issuance ( in shares)			23,722,254
Outstanding stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price as a percentage of fair value	100.00%
Exercise price as a percentage of fair value for shareholders owning specified minimum amount	110.00%
Significant shareholder threshold used for determining exercise price	10.00%
Exercise period	10 years
Weighted average period for recognition of stock-based compensation expense	3 years 7 months 6 days
Outstanding stock options | Share-based Payment Arrangement, Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	1 year
Vesting percentage	25.00%
Outstanding stock options | Share-based Payment Arrangement, Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Vesting percentage	2.08%

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STOCK-BASED COMPENSATION - Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Number of Options Outstanding
Options outstanding, beginning of period (in shares)	11,065,658
Options granted (in shares)	709,448	2,354,515
Options exercised (in shares)	(1,402,538)
Options forfeited (in shares)	(15,435)
Options outstanding, end of period (in shares)	10,357,133		11,065,658
Options vested and exercisable (in shares)	7,273,421
Weighted- Average Exercise Price Per Share
Options outstanding, weighted average exercise price (in dollars per share)	$ 4.27		$ 2.61
Options granted, weighted average exercise price (in dollars per share)	25.53
Options exercised, weighted average exercise price (in dollars per share)	1.97
Options forfeited, weighted average exercise price (in dollars per share)	2.25
Options vested and exercisable, weighted-average exercise price (in dollars per share)	$ 2.15
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted average remaining contractual life, options outstanding	7 years		7 years 2 months 12 days
Weighted average remaining contractual life, options vested and exercisable	6 years 2 months 12 days
Aggregate intrinsic value, options outstanding	$ 328,644		$ 46,516
Aggregate intrinsic value, options vested and exercisable	$ 247,154
Previously Reported
Number of Options Outstanding
Options outstanding, beginning of period (in shares)	51,379,939
Options outstanding, end of period (in shares)			51,379,939
Weighted- Average Exercise Price Per Share
Options outstanding, weighted average exercise price (in dollars per share)			$ 0.56
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted average remaining contractual life, options outstanding			7 years 2 months 12 days
Aggregate intrinsic value, options outstanding			$ 46,516
Retroactive application of recapitalization
Number of Options Outstanding
Options outstanding, beginning of period (in shares)	(40,314,281)
Options outstanding, end of period (in shares)			(40,314,281)
Weighted- Average Exercise Price Per Share
Options outstanding, weighted average exercise price (in dollars per share)			$ 2.05

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STOCK-BASED COMPENSATION - Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	$ 1,024	$ 476	$ 1,784	$ 932
Sales and marketing
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	168	150	252	220
Research and development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	264	301	419	486
General and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	$ 592	$ 25	$ 1,113	$ 226

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NET LOSS PER SHARE - Basic and diluted net loss per share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Numerator:
Net loss attributable to common stockholders	$ (100,216)	$ (82,553)	$ (18,981)	$ (17,471)	$ (182,769)	$ (36,452)
Less: Deemed dividend	0		0		0	(9,484)
Net loss attributable to common stockholders, basic	(100,216)		(18,981)		(182,769)	(45,936)
Net loss attributable to common stockholders, diluted	$ (100,216)		$ (18,981)		$ (182,769)	$ (45,936)
Denominator:
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic (in shares)	100,611,965		39,801,379		70,684,750	40,209,877
Weighted-average shares used in computing net loss per share attributable to common stockholders, diluted (in shares)	100,611,965		39,801,379		70,684,750	40,209,877
Net loss per share attributable to common shareholders, basic (in dollars per share)	$ (1.00)		$ (0.48)		$ (2.59)	$ (1.14)
Net loss per share attributable to common shareholders, diluted (in dollars per share)	$ (1.00)		$ (0.48)		$ (2.59)	$ (1.14)

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NET LOSS PER SHARE - Antidilutive securities (Details) - shares	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive shares (in shares)	23,166,935	26,901,491
Convertible promissory notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive shares (in shares)	0	7,473,946
Outstanding stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive shares (in shares)	10,357,133	9,585,364
Outstanding warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive shares (in shares)	12,809,802	9,842,181

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INCOME TAXES (Details) - USD ($)	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Income Tax Disclosure [Abstract]
Provision (benefit) for income taxes, federal	$ 0	$ 0

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COMMITMENTS AND CONTINGNECIES (Details) - Office Space In San Francisco, California $ in Millions	Jun. 30, 2021 USD ($)
Lessee, Lease, Description [Line Items]
Lease term	7 years 8 months 12 days
Total lease payments estimated	$ 15.2