Condensed Statements of Cash Flows $ in Thousands	9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)
Cash Flows From Operating Activities:
Net loss	$ (32,272)	$ (11,892)
Adjustments to reconcile net loss to net cash used in operating activities:
Bargain purchase gain		(643)
Amortization of debt discount and debt issuance costs	3,342	2,213
Non-cash interest expense from long-term debt and convertible notes	5,395	5,130
Loss on extinguishment of convertible notes	16,853
Depreciation and amortization	7,948	4,415
Gain on extinguishment of PPP loan	(3,036)
Stock-based compensation expense	5,684	754
Change in fair value of redeemable convertible preferred stock warrant liability	535	(34)
Change in fair value of contingent consideration liability	780
Change in fair value of derivative liabilities	(15,243)	(9,201)
Deferred taxes		(132)
Net changes in operating assets and liabilities:
Accounts receivable, net	1,621	(4,820)
Inventory	(6,600)	5,325
Prepaid expenses and other current assets	(2,461)	(1,914)
Accounts payable	4,951	(723)
Accrued liabilities	1,227	1,000
Accrued compensation	(30)	(48)
Net cash used in operating activities	(11,306)	(10,570)
Cash Flows From Investing Activities:
Cash paid for business combination		(15,000)
Purchase of property and equipment	(888)	(726)
Net cash used in investing activities	(888)	(15,726)
Cash Flows From Financing Activities:
Proceeds from issuance of common stock	963	91
Proceeds from issuance of convertible notes and borrowing under term loans, net of payment of lender fees and costs		17,959
Net cash provided by financing activities	963	18,050
Net decrease in cash, cash equivalents and restricted cash	(11,231)	(8,246)
Cash, cash equivalents and restricted cash at the beginning of the period	25,166	34,783
Cash, cash equivalents and restricted cash at the end of the period	13,935	26,537
Reconciliation of cash, cash equivalents and restricted cash to balance sheets
Cash and cash equivalents	6,128	18,839
Restricted cash	7,807	7,698
Cash, cash equivalents and restricted cash in balance sheets	13,935	26,537
Supplemental Disclosure of Cash Flow Information:
Cash paid for interest	1,894	1,338
Supplemental Disclosure of Non-cash Items:
Forgiveness of PPP loan	(3,036)
Issuance of derivative instruments related to convertible notes		6,849
Fair value of net assets acquired in business combination		57,222
Fair value of contingent consideration in connection to business combination		23,842
Fair value of delayed cash consideration in connection to business combination		15,000
Issuance of Series D redeemable convertible preferred stock in connection to business combination		2,737
Vesting of early exercised stock options	54
Reclassification of inventory to property and equipment for customer usage agreements	$ 1,934	$ 264