10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-Q

(Mark One)

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

For the quarterly period ended March 31, 2021

OR

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

For the transition period from ____________ to ________

Commission File Number 001-37687

EDITAS MEDICINE, INC.

(Exact name of registrant as specified in its charter)

Delaware (State or other jurisdiction of incorporation or organization)	46-4097528 (I.R.S. Employer Identification No.)
11 Hurley Street Cambridge, Massachusetts (Address of principal executive offices)	02141 (Zip Code)

(617) 401-9000

(Registrant’s telephone number, including area code)

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, $0.0001 par value per share	EDIT	The Nasdaq Stock Market LLC

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 ⌧

The number of shares of Common Stock outstanding as of April 30, 2021 was 67,826,436.

Editas Medicine, Inc.

TABLE OF CONTENTS

		Page
PART I. FINANCIAL INFORMATION		3
Item 1.	Financial Statements (unaudited)	3
	Condensed Consolidated Balance Sheets as of March 31, 2021 and December 31, 2020	3
	Condensed Consolidated Statements of Operations for the three months ended March 31, 2021 and 2020	4
	Condensed Consolidated Statements of Comprehensive Loss for the three months ended March 31, 2021 and 2020	5
	Condensed Consolidated Statements of Stockholders’ Equity for the three months ended March 31, 2021 and 2020	6
	Condensed Consolidated Statements of Cash Flows for the three months ended March 31, 2021 and 2020	7
	Notes to Condensed Consolidated Financial Statements	8
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	14
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	24
Item 4.	Controls and Procedures	24
PART II. OTHER INFORMATION		26
Item 1.	Legal Proceedings	26
Item 1A.	Risk Factors	26
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	26
Item 6.	Exhibits	27
Signatures		28

2

PART I. FINANCIAL INFORMATION

Item 1.    Financial Statements.

Editas Medicine, Inc.

Condensed Consolidated Balance Sheets

(unaudited)

(amounts in thousands, except share and per share data)

	March 31,		December 31,
	2021		2020
ASSETS
Current assets:
Cash and cash equivalents	$	354,918	$	139,682
Marketable securities		270,415		262,428
Accounts receivable		672		6,048
Prepaid expenses and other current assets		6,311		10,929
Total current assets		632,316		419,087
Marketable securities		97,890		109,664
Property and equipment, net		14,095		14,020
Right-of-use assets		29,305		25,128
Restricted cash and other non-current assets		6,688		4,703
Total assets	$	780,294	$	572,602
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:
Accounts payable	$	8,910	$	6,408
Accrued expenses		15,132		24,046
Deferred revenue, current		32,704		20,943
Operating lease liabilities		7,264		6,811
Total current liabilities		64,010		58,208
Operating lease liabilities, net of current portion		21,621		19,324
Deferred revenue, net of current portion		56,667		73,984
Other non-current liabilities		—		27,500
Total liabilities		142,298		179,016
Stockholders’ equity
Preferred stock, $0.0001 par value per share: 5,000,000 shares authorized; no shares issued or outstanding		—		—
Common stock, $0.0001 par value per share: 195,000,000 shares authorized; 67,580,615 and 62,689,457 shares issued, and 67,472,615 and 62,563,457 shares outstanding at March 31, 2021 and December 31, 2020, respectively		7		6
Additional paid-in capital		1,359,987		1,058,823
Accumulated other comprehensive loss		(73)		(46)
Accumulated deficit		(721,925)		(665,197)
Total stockholders’ equity		637,996		393,586
Total liabilities and stockholders’ equity	$	780,294	$	572,602

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

3

Editas Medicine, Inc.

Condensed Consolidated Statements of Operations

(unaudited)

(amounts in thousands, except per share and share data)

	Three Months Ended
	March 31,
	2021		2020
Collaboration and other research and development revenues	$	6,499	$	5,723
Operating expenses:
Research and development		41,937		34,570
General and administrative		21,445		17,769
Total operating expenses		63,382		52,339
Operating loss		(56,883)		(46,616)
Other income, net:
Other income, net		21		7,333
Interest income, net		134		1,559
Total other income, net		155		8,892
Net loss	$	(56,728)	$	(37,724)
Net loss per share, basic and diluted	$	(0.86)	$	(0.69)
Weighted-average common shares outstanding, basic and diluted		65,992,395		54,590,194

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

4

Editas Medicine, Inc.

Condensed Consolidated Statements of Comprehensive Loss

(unaudited)

(amounts in thousands)

	Three Months Ended
	March 31,
	2021		2020
Net loss	$	(56,728)	$	(37,724)
Other comprehensive (loss) income:
Unrealized (loss) gain on marketable debt securities		(27)		587
Comprehensive loss	$	(56,755)	$	(37,137)

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

5

Editas Medicine, Inc.

Condensed Consolidated Statements of Stockholders’ Equity

(unaudited)

(amounts in thousands, except share data)

						Accumulated
				Additional		Other		Other		Total
	Common Stock			Paid-In		Comprehensive		Accumulated		Stockholders’
	Shares	Amount		Capital		Loss		Deficit		Equity
Balance at December 31, 2020	62,563,457	$	6	$	1,058,823	$	(46)	$	(665,197)	$	393,586
Issuance of common stock for public offering	4,025,000		1		249,458		—		—		249,459
Issuance of common stock for success payment	303,599		—		27,500		—		—		27,500
Exercise of stock options	501,162		—		12,002		—		—		12,002
Vesting of restricted common stock awards	79,397		—		—		—		—		—
Stock-based compensation expense	—		—		12,204		—		—		12,204
Unrealized loss on marketable debt securities	—		—		—		(27)		—		(27)
Net loss	—		—		—		—		(56,728)		(56,728)
Balance at March 31, 2021	67,472,615	$	7	$	1,359,987	$	(73)	$	(721,925)	$	637,996

						Accumulated
				Additional		Other		Other		Total
	Common Stock			Paid-In		Comprehensive		Accumulated		Stockholders’
	Shares	Amount		Capital		Income		Deficit		Equity
Balance at December 31, 2019	54,355,798	$​	5	$​	811,546	$​	107	$​	(549,221)		262,437
Exercise of stock options	233,208		—		3,047		—		—		3,047
Vesting of restricted common stock awards	213,393		—		—		—		—		—
Stock-based compensation expense	—		—		6,220		—		—		6,220
Unrealized gain on marketable debt securities	—		—		—		587		—		587
Net loss	—		—		—		—		(37,724)		(37,724)
Balance at March 31, 2020	54,802,399	$	5	$	820,813	$	694	$	(586,945)	$	234,567

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

6

Editas Medicine, Inc.

Condensed Consolidated Statements of Cash Flows

(unaudited)

(amounts in thousands)

	Three Months Ended
	March 31,
	2021		2020
Cash flow from operating activities
Net loss	$	(56,728)	$	(37,724)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense		12,204		6,220
Depreciation		1,163		798
Unrealized gain on corporate equity securities		—		(7,333)
Other non-cash items, net		401		(215)
Changes in operating assets and liabilities:
Accounts receivable		5,376		(1,414)
Prepaid expenses and other current assets		4,618		(1,995)
Right-of-use assets		(4,177)		1,739
Other non-current assets		(1,985)		93
Accounts payable		2,017		4,767
Accrued expenses		(9,563)		(13,644)
Deferred revenue		(5,555)		(4,309)
Operating lease liabilities		2,750		(1,902)
Other current and non-current liabilities		—		833
Net cash used in operating activities		(49,479)		(54,086)
Cash flow from investing activities
Purchases of property and equipment		(84)		(2,152)
Purchases of marketable securities		(127,422)		(66,384)
Proceeds from maturities of marketable securities		130,750		115,000
Net cash provided by investing activities		3,244		46,464
Cash flow from financing activities
Proceeds from offering of common stock, net of issuance costs		249,469		—
Proceeds from exercise of stock options		12,002		3,047
Net cash provided by financing activities		261,471		3,047
Net increase (decrease) in cash, cash equivalents, and restricted cash		215,236		(4,575)
Cash, cash equivalents, and restricted cash, beginning of period		143,559		239,802
Cash, cash equivalents, and restricted cash, end of period	$	358,795	$	235,227
Supplemental disclosure of cash and non-cash activities:
Fixed asset additions included in accounts payable and accrued expenses	$	467	$	705
Cash paid in connection with operating lease liabilities		4,248		2,538
Offering costs included in accounts payable and accrued expenses		10		—
Issuance of common stock for settlement of success payments		27,500		—

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

7

Editas Medicine, Inc.

Notes to Condensed Consolidated Financial Statements

(unaudited)

1. Nature of Business

Editas Medicine, Inc. (the “Company”) is a leading, clinical stage genome editing company dedicated to developing potentially transformative genomic medicines to treat a broad range of serious diseases. The Company was incorporated in the state of Delaware in September 2013. Its principal offices are in Cambridge, Massachusetts.

Since its inception, the Company has devoted substantially all of its efforts to business planning, research and development, recruiting management and technical staff, and raising capital. The Company has primarily financed its operations through various equity financings, payments received under a research collaboration with Juno Therapeutics, a wholly-owned subsidiary of the Bristol-Myers Squibb Company (“Juno Therapeutics”), payments received under a strategic alliance and option agreement with Allergan Pharmaceuticals International Limited (together with its affiliates, “Allergan”), which was terminated in August 2020, and its license agreement with Beam Therapeutics.

The Company is subject to risks common to companies in the biotechnology industry, including but not limited to, risks of failure of preclinical studies and clinical trials, the need to obtain marketing approval for any drug product candidate that it may identify and develop, the need to successfully commercialize and gain market acceptance of its product candidates, dependence on key personnel, protection of proprietary technology, compliance with government regulations, development by competitors of technological innovations and ability to transition from pilot-scale manufacturing to large-scale production of products.

Liquidity

In January 2021, the Company completed a public offering whereby it sold 3,500,000 shares of its common stock and received net proceeds of approximately $216.9 million. In February 2021, the underwriters in the public offering exercised their option to purchase an additional 525,000 shares, resulting in additional net proceeds to the Company of approximately $32.6 million.

The Company has incurred annual net operating losses in every year since its inception. The Company expects that its existing cash, cash equivalents and marketable securities at March 31, 2021 and anticipated interest income will enable it to fund its operating expenses and capital expenditure requirements well into 2023. The Company had an accumulated deficit of $721.9 million at March 31, 2021, and will require substantial additional capital to fund its operations. The Company has never generated any product revenue. There can be no assurance that the Company will be able to obtain additional debt or equity financing or generate product revenue or revenues from collaborative partners, on terms acceptable to the Company, on a timely basis or at all. The failure of the Company to obtain sufficient funds on acceptable terms when needed could have a material adverse effect on the Company’s business, results of operations, and financial condition.

2. Summary of Significant Accounting Policies

Unaudited Interim Financial Information

The condensed consolidated financial statements of the Company included herein have been prepared, without audit, pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”). Certain information and footnote disclosures normally included in financial statements prepared in accordance with generally accepted accounting principles in the United States of America (“GAAP”) have been condensed or omitted from this report, as is permitted by such rules and regulations. Accordingly, these condensed consolidated financial statements should be read in conjunction with the financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2020 (the “Annual Report”).

8

The unaudited condensed consolidated financial statements include the accounts of the Company and its wholly owned subsidiary, Editas Securities Corporation. All intercompany transactions and balances of the subsidiary have been eliminated in consolidation. In the opinion of management, the information furnished reflects all adjustments, all of which are of a normal and recurring nature, necessary for a fair presentation of the results for the reported interim periods. The Company considers events or transactions that occur after the balance sheet date but before the financial statements are issued to provide additional evidence relative to certain estimates or to identify matters that require additional disclosure. The three months ended March 31, 2021 and 2020 are referred to as the first quarter of 2021 and 2020, respectively. The results of operations for interim periods are not necessarily indicative of results to be expected for the full year or any other interim period.

Summary of Significant Accounting Policies

The Company’s significant accounting policies are described in Note 2, “Summary of significant accounting policies,” to the consolidated financial statements included in the Annual Report. There have been no material changes to the significant accounting policies previously disclosed in the Annual Report.

3. Cash Equivalents and Marketable Securities

Cash equivalents and marketable securities consisted of the following at March 31, 2021 (in thousands):

			Allowance		Gross		Gross
	Amortized		for Credit		Unrealized		Unrealized		Fair
March 31, 2021	Cost		Losses		Gains		Losses		Value
Cash equivalents and marketable securities:
Money market funds	$	344,918	$	—	$	—	$	—	$	344,918
U.S. Treasuries		81,255		—		7		(2)		81,260
Government agency securities		154,022		—		7		(41)		153,988
Corporate notes/bonds		50,249		—		—		(41)		50,208
Commercial Paper		92,852		—		1		(4)		92,849
Total	$	723,296	$	—	$	15	$	(88)	$	723,223

Cash equivalents and marketable securities consisted of the following at December 31, 2020 (in thousands):
​

			Allowance		Gross		Gross
	Amortized		for Credit		Unrealized		Unrealized		Fair
December 31, 2020	Cost		Losses		Gains		Losses		Value
Cash equivalents and marketable securities:
Money market funds	$	139,682	$	—	$	—	$	—	$	139,682
U.S. Treasuries		180,376		—		8		(11)		180,373
Government agency securities		107,665		—		—		(20)		107,645
Commercial paper		41,912		—		—		(8)		41,904
Corporate notes/bonds		42,185		—		10		(25)		42,170
Total	$	511,820	$	—	$	18	$	(64)	$	511,774

As of March 31, 2021, the Company did not hold any marketable securities that had been in an unrealized loss position for more than twelve months. Furthermore, the Company has determined that there were no material changes in the credit risk of the debt securities. As of March 31, 2021, the Company holds 44 securities with an aggregate fair value of $97.9 million that had remaining maturities between one and two years.

There were no realized gains or losses on available-for-sale securities during the three months ended March 31, 2021 or 2020.

9

4. Fair Value Measurements

Assets measured at fair value on a recurring basis as of March 31, 2021 were as follows (in thousands):

			Quoted Prices		Significant
			in Active		Other		Significant
			Markets for		Observable		Unobservable
	March 31,		Identical Assets		Inputs		Inputs
Financial Assets	2021		(Level 1)		(Level 2)		(Level 3)
Cash equivalents:
Money market funds	$	344,918	$	344,918	$	—	$	—
Marketable securities:
U.S. Treasuries		81,260		81,260		—		—
Government agency securities		153,988		—		153,988		—
Commercial paper		92,849		—		92,849		—
Corporate notes/bonds		50,208		—		50,208		—
Restricted cash and other non-current assets:
Money market funds		3,877		3,877		—		—
Total financial assets	$	727,100	$	430,055	$	297,045	$	—

Assets measured at fair value on a recurring basis as of December 31, 2020 were as follows (in thousands):

			Quoted Prices		Significant
			in Active		Other		Significant
			Markets for		Observable		Unobservable
	December 31,		Identical Assets		Inputs		Inputs
Financial Assets	2020		(Level 1)		(Level 2)		(Level 3)
Cash equivalents:
Money market funds	$	139,682	$	139,682	$	—	$	—
Marketable securities:
U.S. Treasuries		180,373		180,373		—		—
Government agency securities		107,645		—		107,645		—
Commercial paper		41,904		—		41,904
Corporate bonds		42,170		—		42,170
Restricted cash and other non-current assets:
Money market funds		3,877		3,877		—		—
Total financial assets	$	515,651	$	323,932	$	191,719	$	—

5. Accrued Expenses

Accrued expenses consisted of the following (in thousands):

	As of
	March 31,		December 31,
	2021		2020
External research and development expenses	$	6,795	$	12,820
Employee related expenses		4,439		5,323
Intellectual property and patent related fees		2,320		4,240
Professional service expenses		660		533
Other expenses		505		359
Sublicensing expenses		413		771
Total accrued expenses	$	15,132	$	24,046

10

6. Property and Equipment, net

Property and equipment, net consisted of the following (in thousands):

	As of
	March 31,		December 31,
	2021		2020
Laboratory equipment	$	18,282	$	18,433
Leasehold improvements		5,341		4,967
Construction-in-progress		1,245		500
Computer equipment		858		858
Furniture and office equipment		239		239
Software		118		118
Total property and equipment		26,083		25,115
Less: accumulated depreciation		(11,988)		(11,095)
Property and equipment, net	$	14,095	$	14,020

7. Commitments and Contingencies

The Company is a party to a number of license agreements under which the Company licenses patents, patent applications and other intellectual property from third parties. As such, the Company is obligated to pay licensors for various costs including upfront licenses fees, annual license fees, certain licensor expense reimbursements, success payments, research funding payments, and milestones triggerable upon certain development, regulatory, and commercial events as well as royalties on future products. These contracts are generally cancellable, with notice, at the Company’s option and do not have significant cancellation penalties. The terms and conditions as well as the accounting analysis for the Company’s significant commitments and contingencies are described in Note 8, “Commitments and Contingencies” to the consolidated financial statements included in the Annual Report. There have been no material changes to the terms and conditions, or the accounting conclusions previously disclosed in the Annual Report.

Licensor Expense Reimbursement

The Company is obligated to reimburse The Broad Institute, Inc. (“Broad”) and the President and Fellows of Harvard College (“Harvard”) for expenses incurred by each of them associated with the prosecution and maintenance of the patent rights that the Company licenses from them pursuant to the license agreement by and among the Company, Broad and Harvard, including the interference and opposition proceedings involving patents licensed to the Company under the license agreement, and other license agreements between the Company and Broad. As such, the Company anticipates that it has a substantial commitment in connection with these proceedings until such time as these proceedings have been resolved, but the amount of such commitment is not determinable. The Company incurred an aggregate of $3.8 million in expense during both the three months ended March 31, 2021 and 2020 for such reimbursement.

8. Collaboration and Profit-Sharing Agreements

The Company has entered into multiple collaborations, out-licenses and strategic alliances with third parties that typically involve payments to or from the Company, including up-front payments, payments for research and development services, option payments, milestone payments and royalty payments to or from the Company. The terms and conditions as well as the accounting analysis for the Company’s significant collaborations, out-licenses and strategic alliances are described in Note 9, “Collaboration and Profit-Sharing Agreements” to the consolidated financial statements included in the Annual Report. There have been no material changes to the terms and conditions, or the accounting conclusions previously disclosed in the Annual Report.

Collaboration Revenue

As of March 31, 2021, the Company’s contract liabilities were primarily related to the Company’s collaboration

11

with Juno Therapeutics. The following table presents changes in the Company’s accounts receivable and contract liabilities for the three months ended March 31, 2021 (in thousands):

For the three months ended March 31, 2021	Balance at December 31, 2020		Additions		Deductions		Balance at March 31, 2021
Accounts receivable	$	6,048	$	316	$	(5,692)	$	672
Contract liabilities:
Deferred revenue	$	94,927	$	150	$	(5,706)	$	89,371

During the three months ended March 31, 2021, the Company recognized the following collaboration revenue (in thousands):

	Three Months Ended
Revenue recognized in the period from:	March 31, 2021
Amounts included in deferred revenue at the beginning of the period	$	5,706
Performance obligations satisfied in previous periods	$	—

9. Stock-based Compensation

Total compensation cost recognized for all stock-based compensation awards in the condensed consolidated statements of operations was as follows (in thousands):

	Three Months Ended
	March 31,
	2021		2020
Research and development	$	3,966	$	3,057
General and administrative		8,238		3,163
Total stock-based compensation expense	$	12,204	$	6,220

Restricted Stock and Restricted Stock Unit Awards

The following is a summary of restricted stock and restricted stock unit awards activity for the three months ended March 31, 2021:

		Weighted
		Average
		Grant Date
		Fair Value
	Shares	Per Share
Unvested restricted stock and restricted stock unit awards as of December 31, 2020	507,450	$	27.35
Issued	424,017	$	52.49
Vested	(79,397)	$	27.48
Forfeited	(54,036)	$	32.69
Unvested restricted stock and restricted stock unit awards as of March 31, 2021	798,034	$	40.94

As of March 31, 2021, total unrecognized compensation expense related to unvested restricted stock and restricted stock unit awards was $24.8 million, which the Company expects to recognize over a remaining weighted-average period of 2.5 years.

12

Stock Options

The following is a summary of stock option activity for the three months ended March 31, 2021:

		Weighted Average		Remaining	Aggregate Intrinsic
	Shares	Exercise Price		Contractual Life (years)	Value (in thousands)
Outstanding at December 31, 2020	3,912,257	$	27.26	7.9	$	167,640
Granted	913,803	$	46.42
Exercised	(501,162)	$	23.95
Cancelled	(488,579)	$	28.19
Outstanding at March 31, 2021	3,836,319	$	32.14	7.1	$	43,349
Exercisable at March 31, 2021	1,503,421	$	25.21	4.3	$	25,238

As of March 31, 2021, total unrecognized compensation expense related to stock options was $41.6 million, which the Company expects to recognize over a remaining weighted-average period of 2.6 years.

10. Net Loss per Share

Basic net loss per common share is calculated by dividing the net loss attributable to common stockholders by the weighted average number of shares of common stock outstanding during the period, without consideration for potentially dilutive securities. Diluted net loss per share is computed by dividing the net loss attributable to common stockholders by the weighted average number of shares of common stock and potentially dilutive securities outstanding for the period determined using the treasury stock and if converted methods. Contingently issuable shares are included in the calculation of basic loss per share as of the beginning of the period in which all the necessary conditions have been satisfied. Contingently issuable shares are included in diluted loss per share based on the number of shares, if any, that would be issuable under the terms of the arrangement if the end of the reporting period was the end of the contingency period, if the results are dilutive.

For purposes of the diluted net loss per share calculation, stock options are considered to be common stock equivalents, but they were excluded from the Company’s calculation of diluted net loss per share allocable to common stockholders because their inclusion would have been anti-dilutive. Therefore, basic and diluted net loss per share applicable to common stockholders were the same for all periods presented.

The following common stock equivalents were excluded from the calculation of diluted net loss per share allocable to common stockholders because their inclusion would have been anti-dilutive:

	Three Months Ended
	March 31,
	2021	2020
Unvested restricted stock and restricted stock unit awards	798,034	638,054
Outstanding stock options	3,836,319	4,862,947
Total	4,634,353	5,501,001

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Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations.

The following discussion and analysis of our financial condition and results of operations should be read together with our condensed consolidated financial statements and related notes appearing elsewhere in this Quarterly Report on Form 10-Q and our Annual Report on Form 10-K for the year ended December 31, 2020, which was filed with the Securities and Exchange Commission (“SEC”) on February 26, 2021 (the “Annual Report”).

This Quarterly Report on Form 10-Q contains forward-looking statements that involve substantial risks and uncertainties. The words “anticipate,” “believe,” “estimate,” “expect,” “intend,” “may,” “plan,” “predict,” “project,” “would” and similar expressions are intended to identify forward-looking statements, although not all forward-looking statements contain these identifying words. All statements addressing our future operating performance and clinical development and regulatory timelines that we expect or anticipate will occur in the future, are forward-looking statements. There are a number of important risks and uncertainties that could cause our actual results to differ materially from those indicated by forward-looking statements, including uncertainties inherent in the initiation and completion of pre-clinical studies and clinical trials and clinical development of our product candidates; availability and timing of results from pre-clinical studies and clinical trials; whether interim results from a clinical trial will be predictive of the final results of the trial or the results of future trials; expectations for regulatory approvals to conduct trials or to market products and availability of funding sufficient for our foreseeable and unforeseeable operating expenses and capital expenditure requirements. These and other risks are described in greater detail in our Annual Report under the captions “Risk Factor Summary” and “Risk Factors,” and in other filings that we may make with the SEC in the future. We may not actually achieve the plans, intentions or expectations disclosed in our forward-looking statements, and you should not place undue reliance on our forward-looking statements. Actual results or events could differ materially from the plans, intentions and expectations disclosed in the forward-looking statements we make. Our forward-looking statements do not reflect the potential impact of any future acquisitions, mergers, dispositions, joint ventures or investments that we may make.

You should read this Quarterly Report on Form 10-Q and the documents that we have filed as exhibits to this Quarterly Report on Form 10-Q completely and with the understanding that our actual future results may be materially different from what we expect. The forward-looking statements contained in this Quarterly Report on Form 10-Q are made as of the date of this Quarterly Report on Form 10-Q, and we do not assume any obligation to update any forward-looking statements, whether as a result of new information, future events or otherwise, except as required by applicable law.

Overview

We are a leading, clinical stage genome editing company dedicated to developing potentially transformative gene-editing medicines to treat a broad range of serious diseases. We have developed a proprietary gene-editing platform based on CRISPR technology and we continue to expand its capabilities. Our product development strategy is to target diseases of high unmet need where we aim to make differentiated, transformational medicines using our gene-editing platform. We are advancing in vivo gene-editing medicines, in which the medicine is injected or infused into the patient to edit the cells inside their body, ex vivo gene-edited cell medicines, in which cells collected from a patient are edited with our technology and then administered back to that same patient, and cellular therapy medicines, in which we use our technology to edit cells collected from a donor to develop medicines that can be administered to a separate patient. While our discovery efforts have ranged across several diseases and therapeutic areas, the areas where our programs are more mature are in our in vivo gene-editing medicines to treat ocular diseases, our ex vivo gene-edited cell medicines to treat hemoglobinopathies, and our cellular therapy medicines to treat cancer.

In ocular diseases, our most advanced program is designed to address a specific genetic form of retinal degeneration called Leber congenital amaurosis 10 (“LCA10”), a disease for which we are not aware of any available therapies and only one other potential treatment is in clinical trials in the United States and Europe. In mid-2019, we initiated our Phase 1/2 BRILLIANCE clinical trial for EDIT-101, an experimental gene-editing medicine to treat LCA10. We plan to enroll approximately 18 patients in the United States and Europe in up to five cohorts. We completed dosing of the first cohort, the adult low-dose cohort, in 2020. Due to an absence of severe adverse events or dose limiting toxicity in adults treated in the first cohort, the inclusion criteria of the protocol were modified to allow

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inclusion of subjects with better than light perception vision only. Although we experienced slowed enrollment in 2020 for subsequent cohorts due to the ongoing impact of the COVID-19 pandemic, in the first quarter of 2021 we initiated dosing of the second cohort, the adult mid-dose cohort. We expect to announce initial clinical data from the first two cohorts by the end of 2021.

For our ex vivo gene-edited cell medicines, our lead program is EDIT-301, an experimental medicine to treat sickle cell disease, a severe inherited blood disease that causes premature death, and beta-thalassemia, another inherited blood disorder characterized by severe anemia. In December 2020, we submitted an investigational new drug application (“IND”) to the U.S. Food and Drug Administration (“FDA”) for the initiation of a Phase 1/2 clinical trial of EDIT-301, which we refer to as our RUBY trial, for the treatment of sickle cell disease. In January 2021, the FDA cleared the start of enrollment and dosing of patients in the first phase of the trial (which is designed to validate the safety and beneficial effects of the cell editing process). The RUBY trial is active and recruiting patients for enrollment. We expect to begin dosing in the RUBY trial by the end of 2021. In parallel, the FDA has imposed a partial clinical hold and requested we develop a potency assay to ensure that the characteristics of the product released are as expected and confirmed by clinical data collected in the first patients treated. We also aim to submit an IND for EDIT-301 for the treatment of beta-thalassemia by the end of 2021.

In cellular therapy medicines, we continue to develop our capabilities to generate cells from induced pluripotent stem cells to develop engineered cell medicines to treat cancer and are also advancing alpha-beta T cell experimental medicines. In May 2015, we entered into a collaboration with Juno Therapeutics, Inc., a wholly-owned subsidiary of Bristol-Myers Squibb Company (“Juno Therapeutics”), a leader in the emerging field of immuno-oncology, to develop novel engineered alpha-beta T cell therapies for cancer and autoimmune diseases, which was amended and restated in each of May 2018 and November 2019, at which time we also entered into a related license agreement with Juno Therapeutics, which we collectively refer to as our collaboration with them.

In March 2017, we entered into a strategic alliance and option agreement with Allergan Pharmaceuticals International Limited (together with its affiliates, “Allergan”) to discover, develop, and commercialize new gene editing medicines for a range of ocular disorders. In July 2018, Allergan exercised its option to develop and commercialize EDIT-101 and paid us $15.0 million in connection with such exercise (the “EDIT-101 Option Exercise Payment”). We and Allergan subsequently entered into a co-development and commercialization agreement under which we agreed to co-develop and equally split profits and losses for EDIT-101 in the United States. In December 2018, we also received a $25.0 million payment from Allergan in connection with the acceptance of the IND for EDIT-101 (the “EDIT-101 Milestone Payment”). In August 2020, we and Allergan terminated the strategic alliance and option agreement and the co-development and commercialization agreement, and we assumed full rights to EDIT-101 and responsibility for conducting the clinical trial. In connection with such termination, we and Allergan entered into a termination agreement, pursuant to which we made a one-time aggregate payment of $20.0 million to Allergan.

Since our inception in September 2013, our operations have focused on organizing and staffing our company, business planning, raising capital, establishing our intellectual property portfolio, assembling our core capabilities in gene editing, seeking to identify potential product candidates, and undertaking preclinical studies. Except for EDIT-101 and EDIT-301, all of our research programs are still in the preclinical or research stage of development and the risk of failure of all of our research programs is high. We have not generated any revenue from product sales. We have primarily financed our operations through various equity financings and payments received under our research collaboration with Juno Therapeutics, our strategic alliance with Allergan, and our license agreement with Beam Therapeutics.

Since inception, we have incurred significant operating losses. Our net losses were $56.7 million and $37.7 million for the three months ended March 31, 2021 and 2020, respectively. As of March 31, 2021, we had an accumulated deficit of $721.9 million. We expect to continue to incur significant expenses and operating losses for the foreseeable future. Our net losses may fluctuate significantly from quarter to quarter and from year to year. We anticipate that our expenses will increase substantially as we continue our current research programs and our preclinical development activities; progress the clinical development of EDIT-101 for the treatment of LCA10 and EDIT-301 for the treatment of sickle cell disease; seek to identify additional research programs and additional product candidates; initiate preclinical testing and clinical trials for other product candidates we identify and develop; maintain, expand, and

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protect our intellectual property portfolio, including reimbursing our licensors for such expenses related to the intellectual property that we in-license from such licensors; further develop our genome editing platform; hire additional clinical, quality control, and scientific personnel; and incur costs associated with operating as a public company. We do not expect to be profitable for the year ending December 31, 2021 or the foreseeable future.

Although we did not experience any significant impact on our financial condition, results of operations or liquidity due to the ongoing COVID-19 pandemic during the three months ended March 31, 2021, we did experience slowed enrollment in the EDIT-101 clinical trial as a result of the COVID-19 pandemic. The ultimate impact of the COVID-19 pandemic is highly uncertain and we do not yet know the full extent of potential delays or impacts on our business, our ability to continue to raise additional capital, the EDIT-101 or EDIT-301 clinical trials, ongoing preclinical activities, or the global economy as a whole. In March 2020, we implemented a work from home policy, and restricted on-site activities at our facilities in Massachusetts and Colorado to certain manufacturing, laboratory and related support activities in light of the COVID-19 pandemic. Under our return to onsite work plans, we have resumed manufacturing, laboratory and related support activities at our facilities in Massachusetts and Colorado using capacity-limiting measures to comply with social distancing guidelines. As such, it is uncertain as to the full magnitude that the pandemic will have directly or indirectly on our financial condition, liquidity and future results of operations.

Financial Operations Overview

Revenue

To date, we have not generated any revenue from product sales and we do not expect to generate any revenue from product sales for the foreseeable future. In connection with our collaboration with Juno Therapeutics, we have received an aggregate of $126.0 million in payments, which have primarily consisted of the initial upfront and amendment payments, development milestone payments, research funding support and certain opt-in fees. We no longer receive research funding support. As of March 31, 2021, we recorded $85.0 million of deferred revenue in relation to our collaboration with Juno Therapeutics, of which $56.7 million is classified as long-term on our condensed consolidated balance sheet. During the three months ended March 31, 2021, we recognized $5.7 million of previously deferred revenue related to our collaboration with Juno Therapeutics. Under this collaboration, we will recognize revenue upon delivery of option packages to Juno Therapeutics or upon receipt of development milestone payments. We expect that our revenue will fluctuate from quarter-to-quarter and year-to-year as a result of the timing of when we deliver such option packages or receive such milestone payments.

For additional information about our revenue recognition policy related to the Juno Therapeutics collaboration, see “—Critical Accounting Policies and Estimates—Revenue Recognition” included in our Annual Report.

For the foreseeable future we expect substantially all of our revenue will be generated from our collaboration with Juno Therapeutics, and any other collaborations or agreements we may enter into.

Expenses

Research and Development Expenses

Research and development expenses consist primarily of costs incurred for our research and development activities, including our drug discovery efforts and preclinical studies and clinical trials under our research programs, which include:

● employee-related expenses including salaries, benefits, and stock-based compensation expense;

● costs of funding research performed by third parties that conduct research and development and preclinical and clinical activities on our behalf;

● costs of purchasing lab supplies and non-capital equipment used in our preclinical activities and in manufacturing preclinical study materials;

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● consultant fees;

● facility costs including rent, depreciation, and maintenance expenses; and

● fees for acquiring and maintaining licenses under our third-party licensing agreements, including any sublicensing or success payments made to our licensors.

Research and development costs are expensed as incurred. At this time, we cannot reasonably estimate or know

the nature, timing, and estimated costs of the efforts that will be necessary to complete the development of any product candidates we may identify and develop. This is due to the numerous risks and uncertainties associated with developing such product candidates, including the uncertainty of:

● successful completion of preclinical studies, IND-enabling studies and natural history studies;

● successful enrollment in, and completion of, clinical trials;

● receipt of marketing approvals from applicable regulatory authorities;

● establishing clinical, commercial manufacturing capabilities or making arrangements with third-party manufacturers;

● obtaining and maintaining patent and trade secret protection and non-patent exclusivity;

● launching commercial sales of a product, if and when approved, whether alone or in collaboration with others;

● acceptance of a product, if and when approved, by patients, the medical community, and third-party payors;

● effectively competing with other therapies and treatment options;

● a continued acceptable safety profile following approval;

● enforcing and defending intellectual property and proprietary rights and claims; and

● achieving desirable medicinal properties for the intended indications.

A change in the outcome of any of these variables with respect to the development of any product candidates we develop would significantly change the costs, timing, and viability associated with the development of that product candidate.

Research and development activities are central to our business model. We expect research and development costs to increase significantly for the foreseeable future as our development programs progress, including as we continue to progress the clinical development of EDIT-101 and EDIT-301 as well as supporting preclinical studies for our other research programs.

General and Administrative Expenses

General and administrative expenses consist primarily of salaries and other related costs, including stock-based compensation for personnel in executive, finance, investor relations, business development, legal, corporate affairs, information technology, facilities and human resource functions. Other significant costs include corporate facility costs not otherwise included in research and development expenses, legal fees related to intellectual property and corporate matters, and fees for accounting and consulting services.

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We anticipate that our general and administrative expenses will increase in the future to support continued research and development activities and potential commercialization of any product candidates we identify and develop. These increases will include increased costs related to the hiring of additional personnel and fees to outside consultants. We also anticipate increased expenses related to reimbursement of third-party patent-related expenses and expenses associated with operating as a public company, including costs for audit, legal, regulatory, and tax-related services, director and officer insurance premiums, and investor relations costs. With respect to reimbursement of third-party intellectual property-related expenses specifically, given the ongoing nature of the opposition and interference proceedings involving the patents licensed to us under our license agreements with The Broad Institute, Inc. (“Broad”) and the President and Fellows of Harvard College (“Harvard”), we anticipate general and administrative expenses will continue to be significant.

Other Income, Net

For the three months ended March 31, 2021, other income, net consisted primarily of interest income and accretion of discounts associated with other marketable securities.

For the three months ended March 31, 2020, other income, net consisted primarily of interest income and accretion of discounts associated with marketable securities, partially offset by loss on disposal of property and equipment.

Critical Accounting Policies and Estimates

Our management’s discussion and analysis of our financial condition and results of operations is based on our condensed consolidated financial statements, which have been prepared in accordance with United States generally accepted accounting principles. The preparation of our condensed consolidated financial statements requires us to make judgments and estimates that affect the reported amounts of assets, liabilities, revenues, and expenses, and the disclosure of contingent assets and liabilities in our condensed consolidated financial statements. We base our estimates on historical experience, known trends and events, and various other factors that we believe to be reasonable under the circumstances. Actual results may differ from these estimates under different assumptions or conditions. On an ongoing basis, we evaluate our judgments and estimates in light of changes in circumstances, facts, and experience. The effects of material revisions in estimates, if any, will be reflected in the condensed consolidated financial statements prospectively from the date of change in estimates.

There have been no material changes to our critical accounting policies from those described in “Management’s Discussion and Analysis of Financial Condition and Results of Operations” in our Annual Report.

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Results of Operations

Comparison of the Three Months ended March 31, 2021 and 2020

The following table summarizes our results of operations for the three months ended March 31, 2021 and 2020, together with the changes in those items in dollars (in thousands) and the respective percentages of change:

	Three Months Ended
	March 31,
	2021		2020		Dollar Change		Percentage Change
Collaboration and other research and development revenues	$	6,499	$	5,723	$	776	14	%
Operating expenses:
Research and development		41,937		34,570		7,367	21	%
General and administrative		21,445		17,769		3,676	21	%
Total operating expenses		63,382		52,339		11,043	21	%
Other income, net:
Other income, net		21		7,333		(7,312)	(100)	%
Interest income, net		134		1,559		(1,425)	(91)	%
Total other income, net		155		8,892		(8,737)	(98)	%
Net loss	$	(56,728)	$	(37,724)	$	(19,004)	50	%

Collaboration and other research and development revenues

Collaboration and other research and development revenues increased by $0.8 million, to $6.5 million for the three months ended March 31, 2021 from $5.7 million for three months ended March 31, 2020. This increase was primarily attributable to the recognition of $5.7 million of previously deferred revenue related to Juno Therapeutics in the three months ended March 31, 2021, compared to no revenue recognized related to Juno Therapeutics for the three months ended March 31, 2020, and the recognition in the three months ended March 31, 2020 of $4.4 million of previously deferred revenue in connection with our strategic alliance with Allergan, which was terminated in August 2020, and for which no revenue was recognized in connection with such alliance in the three months ended March 31, 2021.

Research and development expenses

Research and development expenses increased by $7.3 million, to $41.9 million for the three months ended March 31, 2021 from $34.6 million for the three months ended March 31, 2020. The following table summarizes our research and development expenses for the three months ended March 31, 2021 and 2020, together with the changes in those items in dollars (in thousands) and the respective percentages of change:

	Three Months Ended
	March 31,
	2021		2020		Dollar Change		Percentage Change
External research and development expenses	$	13,661	$	18,882	$	(5,221)	(28)	%
Employee related expenses		10,002		8,597		1,405	16	%
Sublicense and license fees		8,980		—		8,980	n/m
Stock-based compensation expenses		3,966		3,057		909	30	%
Facility expenses		3,772		2,898		874	30	%
Other expenses		1,556		1,136		420	37	%
Total research and development expenses	$	41,937	$	34,570	$	7,367	21	%

For our results of operations, we have included the respective percentage of changes, unless greater than 100% or less than (100)%, in which case we have denoted such changes as not meaningful (n/m).

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The increase in research and development expenses for the three months ended March 31, 2021 compared to the three months ended March 31, 2020 was primarily attributable to:

● approximately $9.0 million in increased sublicense and license fees primarily related to the payment of success payments under certain of our license agreements upon the achievement of market capitalization-based milestones in the first quarter of 2021;

● approximately $1.4 million in increased employee related expenses primarily due to an increase in the size of our workforce including the expansion of our research and development organization;

● approximately $0.9 million in increased stock-based compensation expenses;

● approximately $0.8 million in increased facility related expenses; and

● approximately $0.4 million in increased other expenses.

These increases were partially offset by approximately $5.2 million in decreased external research and development expenses related to expenses incurred in the three months ended March 31, 2020 under our profit-sharing arrangement with Allergan and expenses incurred related to an in-license arrangement entered into during the first quarter of 2020 for which there were no similar expenses in the first quarter of 2021. These decreases were partially offset by increases in external research and development expenses related primarily to the clinical and manufacturing development of EDIT-101 and our other programs.

As a result of the termination of our agreements with Allergan, our research and development costs have increased, and we expect will continue to increase as we are now obligated to fund all of the costs related to developing and commercializing the LCA10 program in the United States. In addition, we will increase headcount in our clinical and development organization as a result of the transfer from Allergan to us of the Phase 1/2 clinical trial of EDIT-101 for the treatment of LCA10 as part of the termination of the arrangement with Allergan.

General and administrative expenses

General and administrative expenses increased by $3.7 million, to $21.4 million for the three months ended March 31, 2021 from $17.8 million for the three months ended March 31, 2020.The following table summarizes our general and administrative expenses for the three months ended March 31, 2021 and 2020, together with the changes in those items in dollars (in thousands) and the respective percentages of change:

	Three Months Ended
	March 31,
	2021		2020		Dollar Change		Percentage Change
Stock-based compensation expenses	$	8,238	$	3,163	$	5,075	n/m
Intellectual property and patent related fees		5,115		5,372		(257)	(5)	%
Employee related expenses		4,694		4,685		9	0	%
Other expenses		2,020		2,041		(21)	(1)	%
Professional service expenses		1,378		2,508		(1,130)	(45)	%
Total general and administrative expenses	$	21,445	$	17,769	$	3,676	21	%

The increase in general and administrative expenses for the three months ended March 31, 2021 compared to the three months ended March 31, 2020 was primarily attributable to approximately $5.1 million in increased stock-based compensation expenses related to the acceleration of vesting of certain equity awards held by our former Chief Executive Officer in connection with her separation from our company in February 2021 as well as stock-based

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compensation expense recorded on equity awards granted in connection with the hiring of our new Chief Executive Officer in February 2021.

The increase was partially offset by:

● approximately $1.1 million in decreased professional service expenses primarily due to decreased use of consulting services; and

● approximately $0.3 million in decreased intellectual property and patent related fees.

Other income, net

For the three months ended March 31, 2021, other income, net was $0.2 million, which was primarily attributable to interest income.

For the three months ended March 31, 2020, other income, net was income of $8.9 million, which was primarily attributable to the unrealized gains related to corporate equity securities, interest income and accretion of discounts associated with marketable securities.

Liquidity and Capital Resources

Sources of Liquidity

In January 2021, we completed a public offering whereby we sold 3,500,000 shares of our common stock and received net process of approximately $216.9 million. In February 2021, the underwriters in the public offering exercised their option to purchase an additional 525,000 shares, resulting in additional net proceeds to us of approximately $32.6 million. As of March 31, 2021, we have raised an aggregate of $898.0 million in net proceeds through the sale of shares of our common stock in public offerings and at-the-market offerings. We also have funded our business from payments received under our research collaboration with Juno Therapeutics, our strategic alliance with Allergan, which was terminated in August 2020, and our license agreement with Beam Therapeutics. As of March 31, 2021, we had cash, cash equivalents and marketable securities of $723.2 million.

In addition to our existing cash, cash equivalents and marketable securities we are eligible to earn milestone and other payments under our collaboration agreement with Juno Therapeutics. Our ability to earn the milestone payments and the timing of earning these amounts are dependent upon the timing and outcome of our development, regulatory and commercial activities and, as such, are uncertain at this time. As of March 31, 2021, our right to contingent payments under our collaboration agreement with Juno Therapeutics is our only significant committed potential external source of funds.

Cash Flows

The following table provides information regarding our cash flows for the three months ended March 31, 2021 and 2020 (in thousands):

	Three Months Ended
	March 31,
	2021		2020
Net cash (used in) provided by:
Operating activities	$	(49,479)	$	(54,086)
Investing activities		3,244		46,464
Financing activities		261,471		3,047
Net increase (decrease) in cash, cash equivalents, and restricted cash	$	215,236	$	(4,575)

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Net Cash Used in Operating Activities

The use of cash in all periods resulted primarily from our net losses adjusted for non-cash charges and changes in components of working capital.

Net cash used in operating activities was approximately $49.5 million for the three months ended March 31, 2021, which primarily consisted of operating expenses that relate to our on-going preclinical and clinical activities, patent costs and license fees, and increased costs as a result of staffing needs due to our expanding operations. These expenses were partially offset by cash inflows from license fees received in the period.

Net cash used in operating activities was approximately $54.1 million for the three months ended March 31, 2020, which primarily consisted of operating expenses that relate to our on-going preclinical and clinical activities, patent costs and license fees, and increased costs as a result of staffing needs due to our expanding operations. These expenses were partially offset by unrealized gains associated with our corporate equity securities.

Net Cash Used in Investing Activities

Net cash provided by investing activities was approximately $3.2 million for the three months ended March 31, 2021, primarily related to proceeds from maturities of marketable securities of $130.8 million partially offset by costs used to acquire marketable securities of $127.4 million.

Net cash provided by investing activities was approximately $46.5 million for the three months ended March 31, 2020, primarily related to proceeds from maturities of marketable securities of $115.0 million, partially offset by costs to acquire marketable securities of $66.4 million and costs to acquire property and equipment of $2.2 million.

Net Cash Provided by Financing Activities

Net cash provided by financing activities was approximately $261.5 million for the three months ended March 31, 2021 and consisted of $249.5 million in net proceeds received from the offering of our common stock and $12.0 million in proceeds received from exercises of options for our common stock.

Net cash provided by financing activities was approximately $3.0 million for the three months ended March 31, 2020 and consisted of $3.0 million in proceeds received from exercises of options for our common stock.

Funding Requirements

We expect our expenses to increase in connection with our ongoing activities, particularly as we progress the clinical development of EDIT-101 and EDIT-301; further advance our current research programs and our preclinical development activities; seek to identify product candidates and additional research programs; initiate preclinical testing and clinical trials for other product candidates we identify and develop; maintain, expand, and protect our intellectual property portfolio, including reimbursing our licensors for expenses related to the intellectual property that we in-license from such licensors; hire additional clinical, quality control, and scientific personnel; and incur costs associated with operating as a public company. In addition, if we obtain marketing approval for any product candidate that we identify and develop, we expect to incur significant commercialization expenses related to product sales, marketing, manufacturing, and distribution to the extent that such sales, marketing, and distribution are not the responsibility of a collaborator. We do not expect to generate significant recurring revenue unless and until we obtain regulatory approval for and commercialize a product candidate. Furthermore, since 2016 we have incurred, and in future years we expect to continue to incur, significant costs associated with operating as a public company. Accordingly, we will need to obtain substantial additional funding in connection with our continuing operations. If we are unable to raise capital when needed or on attractive terms, we would be forced to delay, reduce, or eliminate our research and development programs or future commercialization efforts.

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We expect that our existing cash, cash equivalents and marketable securities as of March 31, 2021 and anticipated interest income will enable us to fund our operating expenses and capital expenditure requirements well into 2023. We have based our estimates on assumptions that may prove to be wrong, and we may use our available capital resources sooner than we currently expect. Our future capital requirements will depend on many factors, including:

● the scope, progress, results, and costs of drug discovery, preclinical development, laboratory testing, and clinical or natural history study trials for the product candidates we develop;

● the costs of progressing the clinical development of EDIT-101 to treat LCA10;

● the costs of progressing the clinical development of EDIT-301 to treat sickle cell disease;

● the costs of IND-enabling studies for EDIT-301 to treat beta-thalassemia;

● the costs of preparing, filing, and prosecuting patent applications, maintaining and enforcing our intellectual property and proprietary rights, and defending intellectual property-related claims;

● the costs, timing, and outcome of regulatory review of the product candidates we develop;

● the costs of future activities, including product sales, medical affairs, marketing, manufacturing, and distribution, for any product candidates for which we receive regulatory approval;

● the success of our collaboration with Juno Therapeutics;

● whether Juno Therapeutics exercises any of its options to extend the research program term and/or to additional research programs under our collaboration;

● our ability to establish and maintain additional collaborations on favorable terms, if at all;

● the extent to which we acquire or in-license other medicines and technologies;

● the costs of reimbursing our licensors for the prosecution and maintenance of the patent rights in-licensed by us; and

● the costs of operating as a public company.

Identifying potential product candidates and conducting preclinical studies and clinical trials is a time-consuming, expensive, and uncertain process that takes many years to complete, and we may never generate the necessary data or results required to obtain marketing approval and achieve product sales. In addition, any product candidate that we identify and develop, if approved, may not achieve commercial success. Our commercial revenues, if any, will be derived from sales of genomic medicines that we do not expect to be commercially available for many years, if at all. Accordingly, we will need to continue to rely on additional financing to achieve our business objectives. Adequate additional financing may not be available to us on acceptable terms, or at all. Further, our ability to continue to raise additional capital may be adversely impacted by potential worsening global economic conditions and potential disruptions to, and volatility in, the credit and financial markets in the United States and worldwide resulting from the ongoing COVID-19 pandemic.

Until such time, if ever, as we can generate substantial product revenues, we expect to finance our cash needs through a combination of equity offerings, debt financings, collaborations, strategic alliances, and licensing arrangements. To the extent that we raise additional capital through the sale of equity or convertible debt securities, our stockholders’ ownership interests will be diluted, and the terms of these securities may include liquidation or other preferences that adversely affect the rights of our stockholders. Debt financing, if available, may involve agreements that

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include covenants limiting or restricting our ability to take specific actions, such as incurring additional debt, making capital expenditures, or declaring dividends.

If we raise funds through additional collaborations, strategic alliances, or licensing arrangements with third parties, we may have to relinquish valuable rights to our technologies, future revenue streams, research programs, or product candidates or to grant licenses on terms that may not be favorable to us. If we are unable to raise additional funds through equity or debt financings when needed, we may be required to delay, limit, reduce, or terminate our product development or future commercialization efforts or grant rights to develop and market product candidates that we would otherwise prefer to develop and market ourselves.

Contractual Obligations

During the three months ended March 31, 2021, there were no material changes to our contractual obligations and commitments described under Management’s Discussion and Analysis of Financial Condition and Results of Operations in our Annual Report.

Off-Balance Sheet Arrangements

We did not have, during the periods presented, and we do not currently have, any off-balance sheet arrangements, as defined under applicable SEC rules.

Effects of Inflation

Inflation would generally affect our business by increasing our cost of labor and clinical trial costs. We do not believe that inflation had a material effect on our business, financial condition or results of operations during the three months ended March 31, 2021 or 2020.

Item 3.    Quantitative and Qualitative Disclosures About Market Risk.

We are exposed to market risk related to changes in interest rates. As of March 31, 2021, we had cash and cash equivalents of $354.9 million, primarily held in money market mutual funds consisting of U.S. government-backed securities, and marketable securities of $270.4 million, primarily consisting of U.S. government-backed securities and corporate debt securities. Our primary exposure to market risk is interest rate sensitivity, which is affected by changes in the general level of U.S. interest rates, particularly because our investments, including cash equivalents, are in the form, or may be in the form of, money market funds or marketable securities and are or may be invested in U.S. Treasury and U.S. government agency obligations. Due to the short-term maturities and low risk profiles of our investments, an immediate 100 basis point change in interest rates would not have a material effect on the fair market value of our investments.

While we contract with certain vendors and institutions internationally, substantially all of our total liabilities as of March 31, 2021 were denominated in the United States dollar and we believe that we do not have any material exposure to foreign currency exchange rate risk.

Item 4.    Controls and Procedures.

Evaluation of Disclosure Controls and Procedures

Our management, with the participation of our Chief Executive Officer and Chief Financial Officer, evaluated the effectiveness of our disclosure controls and procedures as of March 31, 2021. The term “disclosure controls and procedures,” as defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934 (the “Exchange Act”), means controls and other procedures of a company that are designed to ensure that information required to be disclosed by the company in the reports that it files or submits under the Exchange Act is recorded, processed, summarized and reported, within the time periods specified in the SEC’s rules and forms. Disclosure controls and procedures include, without limitation, controls and procedures designed to ensure that information required to be

24

disclosed by a company in the reports that it files or submits under the Exchange Act is accumulated and communicated to the company’s management, including its principal executive and principal financial officers, or persons performing similar functions, as appropriate to allow timely decisions regarding required disclosure. Our management recognizes that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving their objectives and our management necessarily applies its judgment in evaluating the cost-benefit relationship of possible controls and procedures. Based on the evaluation of our disclosure controls and procedures as of March 31, 2021, our Chief Executive Officer and Chief Financial Officer concluded that, as of such date, our disclosure controls and procedures were effective at the reasonable assurance level.

Changes in Internal Control over Financial Reporting

There were no changes in our internal control over financial reporting that occurred during the period covered by this Quarterly Report on Form 10-Q that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

25

PART II. OTHER INFORMATION

Item 1.    Legal Proceedings.

From time to time, we may become involved in litigation or other legal proceedings relating to claims arising from the ordinary course of business. There can be no assurance that any proceedings that result from these third-party actions will be resolved in our favor. In addition, if they are not resolved in our favor, there can be no assurance that the result will not have a material adverse effect on our business, financial condition, results of operations, or prospects. Certain of our intellectual property rights, including ones licensed to us under our licensing agreements, are subject to, and from time to time may be subject to, priority and validity disputes. For additional information regarding these matters, see Part I, “Item 1A. Risk Factors—Risks Related to Our Intellectual Property” in our Annual Report. Regardless of outcome, litigation or other legal proceedings can have an adverse impact on us because of defense and settlement costs, diversion of management resources, and other factors.

Item 1A.    Risk Factors.

Information regarding risk factors affecting our business is discussed in our Annual Report under the captions “Summary of Risk Factors” and “Risk Factors.” There have been no material changes to the risk factors included in our Annual Report. Please carefully consider the information set forth in this Quarterly Report on Form 10-Q and the risk factors discussed in our Annual Report, which could materially affect our business, financial condition, results of operations, or prospects. The risks described in our Annual Report, as well as other risks and uncertainties, could materially and adversely affect our business, results of operations and financial condition, which in turn could materially and adversely affect the trading price of shares of our common stock. Additional risks not currently known to us or that we currently deem to be immaterial may also harm our business.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds.

On January 22, 2021, we issued an aggregate of 303,599 shares of common stock to The Broad Institute, Inc. (“Broad”) in satisfaction of payment obligations in an aggregate amount of $27.5 million to Broad under the Cpf1 License Agreement and the Sponsored Research Agreement. No underwriters were involved in the foregoing issuance of securities. The securities were issued pursuant to Section 4(a)(2) under the Securities Act, relating to transactions by an issuer not involving any public offering. Prior to receiving the shares, Broad represented to us that it was acquiring the shares for its own account for investment purposes, that it had received from us and our management all of the information that it considered appropriate to evaluate whether to accept the shares, that it was capable of evaluating and understanding the risks of the investment, and that it was an accredited investor as such term is defined in Rule 501 of Regulation D promulgated under the Securities Act.

26

Item 6.    Exhibits

Exhibit Index

Exhibit Number	Description of Exhibit
10.1	Letter Agreement, dated February 15, 2021, by and between the Registrant and Cynthia Collins (incorporated by reference to Exhibit 10.13 to the Company’s Annual Report on Form 10-K (File No. 001-37687) filed with the Securities and Exchange Commission on February 26, 2021).
10.2	Employment Offer Letter, dated February 14, 2021, between the Registrant and James C. Mullen (incorporated by reference to Exhibit 10.14 to the Company’s Annual Report on Form 10-K (File No. 001-37687) filed with the Securities and Exchange Commission on February 26, 2021).
10.3†	First Amendment to Sponsored Research Agreement, dated January 11, 2021, between the Registrant and Broad (incorporated by reference to Exhibit 10.24 to the Company’s Annual Report on Form 10-K (File No. 001-37687) filed with the Securities and Exchange Commission on February 26, 2021).
10.4†	Omnibus Amendment, dated as of January 11, 2021, by and between the Registrant and Broad (incorporated by reference to Exhibit 10.32 to the Company’s Annual Report on Form 10-K (File No. 001-37687) filed with the Securities and Exchange Commission on February 26, 2021).
10.5	Summary of Non-Employee Director Compensation Program (incorporated by reference to Exhibit 10.25 to the Company’s Annual Report on Form 10-K (File No. 001-37687) filed with the Securities and Exchange Commission on February 26, 2021).
31.1*	Rule 13a-14(a) Certification of Principal Executive Officer
31.2*	Rule 13a-14(a) Certification of Principal Financial Officer
32.1+	Certification of Principal Executive Officer and Principal Financial Officer pursuant to 18 U.S.C. §1350
101*	The following financial statements from the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2021, formatted in Inline XBRL (eXtensible Business Reporting Language): (i) Consolidated Balance Sheets (unaudited), (ii) Consolidated Statements of Operations (unaudited), (iii) Consolidated Statements of Comprehensive Loss (unaudited), (iv) Consolidated Statements of Stockholders’ Equity (unaudited), (v) Consolidated Statements of Cash Flows (unaudited) and (vi) Notes to Condensed Consolidated Financial Statements (unaudited), tagged as blocks of text and including detailed tags.
104*	The cover page from the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2021, formatted in Inline XBRL.

*Filed herewith

† Portions of this exhibit have been omitted pursuant to Item 601(b)(10)(iv) of Regulation S-K. Certain portions of this exhibit have been omitted because they are not material and would likely cause competitive harm to the Registrant if disclosed.

+ The certifications furnished in Exhibit 32.1 that accompany this Quarterly Report on Form 10-Q are not deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended. Such certifications are not to be deemed to be incorporated by reference into any filings under the Securities Act of 1933, as amended, or the Securities Exchange Act of 1934, as amended, except to the extent that the registrant specifically incorporates them by reference.

27

SIGNATURES

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.

	EDITAS MEDICINE, INC.
Dated: May 6, 2021	By:	/s/ Michelle Robertson
		Michelle Robertson
		Chief Financial Officer (Principal Financial Officer)

28

EX-31.1

Exhibit 31.1

CERTIFICATIONS

I, James C. Mullen, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Editas Medicine, 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 officer 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. Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

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 officer and I have disclosed, based on our 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 control over financial reporting.

Date: May 6, 2021	By:	/s/ James C. Mullen
		James C. Mullen Chief Executive Officer
		(Principal Executive Officer)

EX-31.2

Exhibit 31.2

CERTIFICATIONS

I, Michelle Robertson, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Editas Medicine, 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 officer 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. Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

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 officer and I have disclosed, based on our 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 control over financial reporting.

Date: May 6, 2021	By:	/s/ Michelle Robertson
		Michelle Robertson Chief Financial Officer
		(Principal Financial Officer)

EX-32.1

Exhibit 32.1

CERTIFICATIONS OF CEO AND CFO PURSUANT TO 18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with this Quarterly Report on Form 10-Q of Editas Medicine, Inc. (the “Company”) for the period ended March 31, 2021, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), each of the undersigned officers of the Company hereby certifies, pursuant to 18 U.S.C. (section) 1350, as adopted pursuant to (section) 906 of the Sarbanes-Oxley Act of 2002, that to the best of her or his 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 operations of the Company.

Date: May 6, 2021	By:	/s/ James C. Mullen
		James C. Mullen
		Chief Executive Officer
Date: May 6, 2021	By:	/s/ Michelle Robertson
		Michelle Robertson
		Chief Financial Officer

XML

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2021	Apr. 30, 2021
Document and Entity Information
Document Type	10-Q
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Mar. 31, 2021
Entity File Number	001-37687
Entity Registrant Name	EDITAS MEDICINE, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	46-4097528
Entity Address, Address Line One	11 Hurley Street
Entity Address, City or Town	Cambridge
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	02141
City Area Code	617
Local Phone Number	401-9000
Title of 12(b) Security	Common Stock
Trading Symbol	EDIT
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		67,826,436
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1
Entity Central Index Key	0001650664
Amendment Flag	false

XML

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 354,918	$ 139,682
Marketable securities	270,415	262,428
Accounts receivable	672	6,048
Prepaid expenses and other current assets	6,311	10,929
Total current assets	632,316	419,087
Marketable securities	97,890	109,664
Property and equipment, net	14,095	14,020
Right-of-use assets	29,305	25,128
Restricted cash and other non-current assets	6,688	4,703
Total assets	780,294	572,602
Current liabilities:
Accounts payable	8,910	6,408
Accrued expenses	15,132	24,046
Deferred revenue, current	32,704	20,943
Operating lease liabilities	7,264	6,811
Total current liabilities	64,010	58,208
Operating lease liabilities, net of current portion	21,621	19,324
Deferred revenue, net of current portion	56,667	73,984
Other non-current liabilities		27,500
Total liabilities	142,298	179,016
Stockholders' equity
Preferred stock, $0.0001 par value per share: 5,000,000 shares authorized; no shares issued or outstanding
Common stock, $0.0001 par value per share: 195,000,0000 shares authorized; 67,580,615 and 62,689,457 shares issued, and 67,472,615 and 62,563,457 shares outstanding at March 31, 2021 and December 31, 2020, respectively	7	6
Additional paid-in capital	1,359,987	1,058,823
Accumulated other comprehensive loss	(73)	(46)
Accumulated deficit	(721,925)	(665,197)
Total stockholders' equity	637,996	393,586
Total liabilities and stockholders' equity	$ 780,294	$ 572,602

XML

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2021	Dec. 31, 2020
Condensed Consolidated Balance Sheets
Preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized	195,000,000	195,000,000
Common stock, shares issued	67,580,615	62,689,457
Common stock, shares outstanding	67,472,615	62,563,457

XML

Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Condensed Consolidated Statements of Operations
Collaboration and other research and development revenues	$ 6,499	$ 5,723
Revenue type	us-gaap:ServiceMember	us-gaap:ServiceMember
Operating expenses:
Research and development	$ 41,937	$ 34,570
General and administrative	21,445	17,769
Total operating expenses	63,382	52,339
Operating loss	(56,883)	(46,616)
Other income, net:
Other income, net	21	7,333
Interest income, net	134	1,559
Total other income, net	155	8,892
Net loss	$ (56,728)	$ (37,724)
Net loss per share, basic and diluted	$ (0.86)	$ (0.69)
Weighted-average common shares outstanding, basic (in shares)	65,992,395	54,590,194

XML

Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Condensed Consolidated Statements of Comprehensive Loss
Net loss	$ (56,728)	$ (37,724)
Other comprehensive (loss) income:
Unrealized (loss) gain on marketable debt securities	(27)	587
Comprehensive loss	$ (56,755)	$ (37,137)

XML

Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive (Loss) Income	Total
Balance, beginning of period at Dec. 31, 2019	$ 5	$ 811,546	$ (549,221)	$ 107	$ 262,437
Balance, beginning of period (in shares) at Dec. 31, 2019	54,355,798
Statement of Stockholders' Equity (Deficit)
Exercise of stock options		3,047			3,047
Exercise of stock options (in shares)	233,208
Stock-based compensation expense		6,220			6,220
Vesting of restricted common stock awards (in shares)	213,393
Unrealized gain (loss) on marketable debt securities				587	587
Net loss			(37,724)		(37,724)
Balance, end of period at Mar. 31, 2020	$ 5	820,813	(586,945)	694	234,567
Balance, end of period (in shares) at Mar. 31, 2020	54,802,399
Balance, beginning of period at Dec. 31, 2020	$ 6	1,058,823	(665,197)	(46)	393,586
Balance, beginning of period (in shares) at Dec. 31, 2020	62,563,457
Statement of Stockholders' Equity (Deficit)
Issuance of common stock for public offering	$ 1	249,458			249,459
Issuance of common stock for public offering (in shares)	4,025,000
Issuance of common stock for success payment		27,500			27,500
Issuance of common stock for success payment (in shares)	303,599
Exercise of stock options		12,002			12,002
Exercise of stock options (in shares)	501,162
Stock-based compensation expense		12,204			12,204
Vesting of restricted common stock awards (in shares)	79,397
Unrealized gain (loss) on marketable debt securities				(27)	(27)
Net loss			(56,728)		(56,728)
Balance, end of period at Mar. 31, 2021	$ 7	$ 1,359,987	$ (721,925)	$ (73)	$ 637,996
Balance, end of period (in shares) at Mar. 31, 2021	67,472,615

XML

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Cash flow from operating activities
Net loss	$ (56,728)	$ (37,724)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	12,204	6,220
Depreciation	1,163	798
Unrealized gain on corporate equity securities		7,333
Other non-cash items, net	401	(215)
Changes in operating assets and liabilities:
Accounts receivable	5,376	(1,414)
Prepaid expenses and other current assets	4,618	(1,995)
Right-of-use assets	(4,177)	1,739
Other non-current assets	(1,985)	93
Accounts payable	2,017	4,767
Accrued expenses	(9,563)	(13,644)
Deferred revenue	(5,555)	(4,309)
Operating lease liabilities	2,750	(1,902)
Other current and non-current liabilities		833
Net cash used in operating activities	(49,479)	(54,086)
Cash flow from investing activities
Purchases of property and equipment	(84)	(2,152)
Purchases of marketable securities	(127,422)	(66,384)
Proceeds from maturities of marketable securities	130,750	115,000
Net cash provided by investing activities	3,244	46,464
Cash flow from financing activities
Proceeds from offering of common stock, net of issuance costs	249,469
Proceeds from exercise of stock options	12,002	3,047
Net cash provided by financing activities	261,471	3,047
Net increase (decrease) in cash, cash equivalents, and restricted cash	215,236	(4,575)
Cash, cash equivalents, and restricted cash, beginning of period	143,559	239,802	$ 239,802
Cash, cash equivalents, and restricted cash, end of period	358,795	235,227	$ 143,559
Supplemental disclosure of cash and non-cash activities:
Fixed asset additions included in accounts payable and accrued expenses	467	705
Cash paid in connection with operating lease liabilities	4,248	$ 2,538
Offering costs included in accounts payable and accrued expenses	10
Issuance of common stock for settlement of success payments	$ 27,500

XML

Nature of Business

3 Months Ended

Mar. 31, 2021

Nature of Business

Nature of Business

1. Nature of Business

Editas Medicine, Inc. (the “Company”) is a leading, clinical stage genome editing company dedicated to developing potentially transformative genomic medicines to treat a broad range of serious diseases. The Company was incorporated in the state of Delaware in September 2013. Its principal offices are in Cambridge, Massachusetts.

Since its inception, the Company has devoted substantially all of its efforts to business planning, research and development, recruiting management and technical staff, and raising capital. The Company has primarily financed its operations through various equity financings, payments received under a research collaboration with Juno Therapeutics, a wholly-owned subsidiary of the Bristol-Myers Squibb Company (“Juno Therapeutics”), payments received under a strategic alliance and option agreement with Allergan Pharmaceuticals International Limited (together with its affiliates, “Allergan”), which was terminated in August 2020, and its license agreement with Beam Therapeutics.

The Company is subject to risks common to companies in the biotechnology industry, including but not limited to, risks of failure of preclinical studies and clinical trials, the need to obtain marketing approval for any drug product candidate that it may identify and develop, the need to successfully commercialize and gain market acceptance of its product candidates, dependence on key personnel, protection of proprietary technology, compliance with government regulations, development by competitors of technological innovations and ability to transition from pilot-scale manufacturing to large-scale production of products.

Liquidity

In January 2021, the Company completed a public offering whereby it sold 3,500,000 shares of its common stock and received net proceeds of approximately $216.9 million. In February 2021, the underwriters in the public offering exercised their option to purchase an additional 525,000 shares, resulting in additional net proceeds to the Company of approximately $32.6 million.

The Company has incurred annual net operating losses in every year since its inception. The Company expects that its existing cash, cash equivalents and marketable securities at March 31, 2021 and anticipated interest income will enable it to fund its operating expenses and capital expenditure requirements well into 2023. The Company had an accumulated deficit of $721.9 million at March 31, 2021, and will require substantial additional capital to fund its operations. The Company has never generated any product revenue. There can be no assurance that the Company will be able to obtain additional debt or equity financing or generate product revenue or revenues from collaborative partners, on terms acceptable to the Company, on a timely basis or at all. The failure of the Company to obtain sufficient funds on acceptable terms when needed could have a material adverse effect on the Company’s business, results of operations, and financial condition.

XML

Summary of Significant Accounting Policies

3 Months Ended

Mar. 31, 2021

Summary of Significant Accounting Policies

Summary of Significant Accounting Policies

2. Summary of Significant Accounting Policies

Unaudited Interim Financial Information

The condensed consolidated financial statements of the Company included herein have been prepared, without audit, pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”). Certain information and footnote disclosures normally included in financial statements prepared in accordance with generally accepted accounting principles in the United States of America (“GAAP”) have been condensed or omitted from this report, as is permitted by such rules and regulations. Accordingly, these condensed consolidated financial statements should be read in conjunction with the financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2020 (the “Annual Report”).

The unaudited condensed consolidated financial statements include the accounts of the Company and its wholly owned subsidiary, Editas Securities Corporation. All intercompany transactions and balances of the subsidiary have been eliminated in consolidation. In the opinion of management, the information furnished reflects all adjustments, all of which are of a normal and recurring nature, necessary for a fair presentation of the results for the reported interim periods. The Company considers events or transactions that occur after the balance sheet date but before the financial statements are issued to provide additional evidence relative to certain estimates or to identify matters that require additional disclosure. The three months ended March 31, 2021 and 2020 are referred to as the first quarter of 2021 and 2020, respectively. The results of operations for interim periods are not necessarily indicative of results to be expected for the full year or any other interim period.

Summary of Significant Accounting Policies

The Company’s significant accounting policies are described in Note 2, “Summary of significant accounting policies,” to the consolidated financial statements included in the Annual Report. There have been no material changes to the significant accounting policies previously disclosed in the Annual Report.

XML

Cash Equivalents and Marketable Securities

3 Months Ended

Mar. 31, 2021

Cash Equivalents and Marketable Securities

Cash Equivalents and Marketable Securities

3. Cash Equivalents and Marketable Securities

Cash equivalents and marketable securities consisted of the following at March 31, 2021 (in thousands):

			Allowance		Gross		Gross
	Amortized		for Credit		Unrealized		Unrealized		Fair
March 31, 2021	Cost		Losses		Gains		Losses		Value
Cash equivalents and marketable securities:
Money market funds	$	344,918	$	—	$	—	$	—	$	344,918
U.S. Treasuries		81,255		—		7		(2)		81,260
Government agency securities		154,022		—		7		(41)		153,988
Corporate notes/bonds		50,249		—		—		(41)		50,208
Commercial Paper		92,852		—		1		(4)		92,849
Total	$	723,296	$	—	$	15	$	(88)	$	723,223

Cash equivalents and marketable securities consisted of the following at December 31, 2020 (in thousands):
​

			Allowance		Gross		Gross
	Amortized		for Credit		Unrealized		Unrealized		Fair
December 31, 2020	Cost		Losses		Gains		Losses		Value
Cash equivalents and marketable securities:
Money market funds	$	139,682	$	—	$	—	$	—	$	139,682
U.S. Treasuries		180,376		—		8		(11)		180,373
Government agency securities		107,665		—		—		(20)		107,645
Commercial paper		41,912		—		—		(8)		41,904
Corporate notes/bonds		42,185		—		10		(25)		42,170
Total	$	511,820	$	—	$	18	$	(64)	$	511,774

As of March 31, 2021, the Company did not hold any marketable securities that had been in an unrealized loss position for more than twelve months. Furthermore, the Company has determined that there were no material changes in the credit risk of the debt securities. As of March 31, 2021, the Company holds 44 securities with an aggregate fair value of $97.9 million that had remaining maturities between one and two years.

There were no realized gains or losses on available-for-sale securities during the three months ended March 31, 2021 or 2020.

XML

Fair Value Measurements

3 Months Ended

Mar. 31, 2021

Fair Value Measurements

Fair Value Measurements

4. Fair Value Measurements

Assets measured at fair value on a recurring basis as of March 31, 2021 were as follows (in thousands):

			Quoted Prices		Significant
			in Active		Other		Significant
			Markets for		Observable		Unobservable
	March 31,		Identical Assets		Inputs		Inputs
Financial Assets	2021		(Level 1)		(Level 2)		(Level 3)
Cash equivalents:
Money market funds	$	344,918	$	344,918	$	—	$	—
Marketable securities:
U.S. Treasuries		81,260		81,260		—		—
Government agency securities		153,988		—		153,988		—
Commercial paper		92,849		—		92,849		—
Corporate notes/bonds		50,208		—		50,208		—
Restricted cash and other non-current assets:
Money market funds		3,877		3,877		—		—
Total financial assets	$	727,100	$	430,055	$	297,045	$	—

Assets measured at fair value on a recurring basis as of December 31, 2020 were as follows (in thousands):

			Quoted Prices		Significant
			in Active		Other		Significant
			Markets for		Observable		Unobservable
	December 31,		Identical Assets		Inputs		Inputs
Financial Assets	2020		(Level 1)		(Level 2)		(Level 3)
Cash equivalents:
Money market funds	$	139,682	$	139,682	$	—	$	—
Marketable securities:
U.S. Treasuries		180,373		180,373		—		—
Government agency securities		107,645		—		107,645		—
Commercial paper		41,904		—		41,904
Corporate bonds		42,170		—		42,170
Restricted cash and other non-current assets:
Money market funds		3,877		3,877		—		—
Total financial assets	$	515,651	$	323,932	$	191,719	$	—

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Accrued Expenses

3 Months Ended

Mar. 31, 2021

Accrued Expenses

Accrued Expenses

5. Accrued Expenses

Accrued expenses consisted of the following (in thousands):

	As of
	March 31,		December 31,
	2021		2020
External research and development expenses	$	6,795	$	12,820
Employee related expenses		4,439		5,323
Intellectual property and patent related fees		2,320		4,240
Professional service expenses		660		533
Other expenses		505		359
Sublicensing expenses		413		771
Total accrued expenses	$	15,132	$	24,046

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Property and Equipment, net

3 Months Ended

Mar. 31, 2021

Property and Equipment, net

Property and Equipment, net

6. Property and Equipment, net

Property and equipment, net consisted of the following (in thousands):

	As of
	March 31,		December 31,
	2021		2020
Laboratory equipment	$	18,282	$	18,433
Leasehold improvements		5,341		4,967
Construction-in-progress		1,245		500
Computer equipment		858		858
Furniture and office equipment		239		239
Software		118		118
Total property and equipment		26,083		25,115
Less: accumulated depreciation		(11,988)		(11,095)
Property and equipment, net	$	14,095	$	14,020

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Commitments and Contingencies

3 Months Ended

Mar. 31, 2021

Commitments and Contingencies

Commitments and Contingencies

7. Commitments and Contingencies

The Company is a party to a number of license agreements under which the Company licenses patents, patent applications and other intellectual property from third parties. As such, the Company is obligated to pay licensors for various costs including upfront licenses fees, annual license fees, certain licensor expense reimbursements, success payments, research funding payments, and milestones triggerable upon certain development, regulatory, and commercial events as well as royalties on future products. These contracts are generally cancellable, with notice, at the Company’s option and do not have significant cancellation penalties. The terms and conditions as well as the accounting analysis for the Company’s significant commitments and contingencies are described in Note 8, “Commitments and Contingencies” to the consolidated financial statements included in the Annual Report. There have been no material changes to the terms and conditions, or the accounting conclusions previously disclosed in the Annual Report.

Licensor Expense Reimbursement

The Company is obligated to reimburse The Broad Institute, Inc. (“Broad”) and the President and Fellows of Harvard College (“Harvard”) for expenses incurred by each of them associated with the prosecution and maintenance of the patent rights that the Company licenses from them pursuant to the license agreement by and among the Company, Broad and Harvard, including the interference and opposition proceedings involving patents licensed to the Company under the license agreement, and other license agreements between the Company and Broad. As such, the Company anticipates that it has a substantial commitment in connection with these proceedings until such time as these proceedings have been resolved, but the amount of such commitment is not determinable. The Company incurred an aggregate of $3.8 million in expense during both the three months ended March 31, 2021 and 2020 for such reimbursement.

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Collaboration and Profit-Sharing Agreements

3 Months Ended

Mar. 31, 2021

Collaboration and Profit-Sharing Agreements

Collaboration and Profit-Sharing Agreements

8. Collaboration and Profit-Sharing Agreements

The Company has entered into multiple collaborations, out-licenses and strategic alliances with third parties that typically involve payments to or from the Company, including up-front payments, payments for research and development services, option payments, milestone payments and royalty payments to or from the Company. The terms and conditions as well as the accounting analysis for the Company’s significant collaborations, out-licenses and strategic alliances are described in Note 9, “Collaboration and Profit-Sharing Agreements” to the consolidated financial statements included in the Annual Report. There have been no material changes to the terms and conditions, or the accounting conclusions previously disclosed in the Annual Report.

Collaboration Revenue

As of March 31, 2021, the Company’s contract liabilities were primarily related to the Company’s collaboration

with Juno Therapeutics. The following table presents changes in the Company’s accounts receivable and contract liabilities for the three months ended March 31, 2021 (in thousands):

For the three months ended March 31, 2021	Balance at December 31, 2020		Additions		Deductions		Balance at March 31, 2021
Accounts receivable	$	6,048	$	316	$	(5,692)	$	672
Contract liabilities:
Deferred revenue	$	94,927	$	150	$	(5,706)	$	89,371

During the three months ended March 31, 2021, the Company recognized the following collaboration revenue (in thousands):

	Three Months Ended
Revenue recognized in the period from:	March 31, 2021
Amounts included in deferred revenue at the beginning of the period	$	5,706
Performance obligations satisfied in previous periods	$	—

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Stock-Based Compensation

3 Months Ended

Mar. 31, 2021

Stock-Based Compensation

Stock-Based Compensation

9. Stock-based Compensation

Total compensation cost recognized for all stock-based compensation awards in the condensed consolidated statements of operations was as follows (in thousands):

	Three Months Ended
	March 31,
	2021		2020
Research and development	$	3,966	$	3,057
General and administrative		8,238		3,163
Total stock-based compensation expense	$	12,204	$	6,220

Restricted Stock and Restricted Stock Unit Awards

The following is a summary of restricted stock and restricted stock unit awards activity for the three months ended March 31, 2021:

		Weighted
		Average
		Grant Date
		Fair Value
	Shares	Per Share
Unvested restricted stock and restricted stock unit awards as of December 31, 2020	507,450	$	27.35
Issued	424,017	$	52.49
Vested	(79,397)	$	27.48
Forfeited	(54,036)	$	32.69
Unvested restricted stock and restricted stock unit awards as of March 31, 2021	798,034	$	40.94

As of March 31, 2021, total unrecognized compensation expense related to unvested restricted stock and restricted stock unit awards was $24.8 million, which the Company expects to recognize over a remaining weighted-average period of 2.5 years.

Stock Options

The following is a summary of stock option activity for the three months ended March 31, 2021:

		Weighted Average		Remaining	Aggregate Intrinsic
	Shares	Exercise Price		Contractual Life (years)	Value (in thousands)
Outstanding at December 31, 2020	3,912,257	$	27.26	7.9	$	167,640
Granted	913,803	$	46.42
Exercised	(501,162)	$	23.95
Cancelled	(488,579)	$	28.19
Outstanding at March 31, 2021	3,836,319	$	32.14	7.1	$	43,349
Exercisable at March 31, 2021	1,503,421	$	25.21	4.3	$	25,238

As of March 31, 2021, total unrecognized compensation expense related to stock options was $41.6 million, which the Company expects to recognize over a remaining weighted-average period of 2.6 years.

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Net Income (Loss) per Share

3 Months Ended

Mar. 31, 2021

Net Income (Loss) per Share

Net Income (Loss) per Share

10. Net Loss per Share

Basic net loss per common share is calculated by dividing the net loss attributable to common stockholders by the weighted average number of shares of common stock outstanding during the period, without consideration for potentially dilutive securities. Diluted net loss per share is computed by dividing the net loss attributable to common stockholders by the weighted average number of shares of common stock and potentially dilutive securities outstanding for the period determined using the treasury stock and if converted methods. Contingently issuable shares are included in the calculation of basic loss per share as of the beginning of the period in which all the necessary conditions have been satisfied. Contingently issuable shares are included in diluted loss per share based on the number of shares, if any, that would be issuable under the terms of the arrangement if the end of the reporting period was the end of the contingency period, if the results are dilutive.

For purposes of the diluted net loss per share calculation, stock options are considered to be common stock equivalents, but they were excluded from the Company’s calculation of diluted net loss per share allocable to common stockholders because their inclusion would have been anti-dilutive. Therefore, basic and diluted net loss per share applicable to common stockholders were the same for all periods presented.

The following common stock equivalents were excluded from the calculation of diluted net loss per share allocable to common stockholders because their inclusion would have been anti-dilutive:

	Three Months Ended
	March 31,
	2021	2020
Unvested restricted stock and restricted stock unit awards	798,034	638,054
Outstanding stock options	3,836,319	4,862,947
Total	4,634,353	5,501,001

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Cash Equivalents and Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2021

Cash Equivalents and Marketable Securities

Schedule of cash equivalents and marketable securities

Cash equivalents and marketable securities consisted of the following at March 31, 2021 (in thousands):

			Allowance		Gross		Gross
	Amortized		for Credit		Unrealized		Unrealized		Fair
March 31, 2021	Cost		Losses		Gains		Losses		Value
Cash equivalents and marketable securities:
Money market funds	$	344,918	$	—	$	—	$	—	$	344,918
U.S. Treasuries		81,255		—		7		(2)		81,260
Government agency securities		154,022		—		7		(41)		153,988
Corporate notes/bonds		50,249		—		—		(41)		50,208
Commercial Paper		92,852		—		1		(4)		92,849
Total	$	723,296	$	—	$	15	$	(88)	$	723,223

Cash equivalents and marketable securities consisted of the following at December 31, 2020 (in thousands):
​

			Allowance		Gross		Gross
	Amortized		for Credit		Unrealized		Unrealized		Fair
December 31, 2020	Cost		Losses		Gains		Losses		Value
Cash equivalents and marketable securities:
Money market funds	$	139,682	$	—	$	—	$	—	$	139,682
U.S. Treasuries		180,376		—		8		(11)		180,373
Government agency securities		107,665		—		—		(20)		107,645
Commercial paper		41,912		—		—		(8)		41,904
Corporate notes/bonds		42,185		—		10		(25)		42,170
Total	$	511,820	$	—	$	18	$	(64)	$	511,774

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Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2021

Fair Value Measurements

Schedule of assets measured at fair value on a recurring basis

Assets measured at fair value on a recurring basis as of March 31, 2021 were as follows (in thousands):

			Quoted Prices		Significant
			in Active		Other		Significant
			Markets for		Observable		Unobservable
	March 31,		Identical Assets		Inputs		Inputs
Financial Assets	2021		(Level 1)		(Level 2)		(Level 3)
Cash equivalents:
Money market funds	$	344,918	$	344,918	$	—	$	—
Marketable securities:
U.S. Treasuries		81,260		81,260		—		—
Government agency securities		153,988		—		153,988		—
Commercial paper		92,849		—		92,849		—
Corporate notes/bonds		50,208		—		50,208		—
Restricted cash and other non-current assets:
Money market funds		3,877		3,877		—		—
Total financial assets	$	727,100	$	430,055	$	297,045	$	—

Assets measured at fair value on a recurring basis as of December 31, 2020 were as follows (in thousands):

			Quoted Prices		Significant
			in Active		Other		Significant
			Markets for		Observable		Unobservable
	December 31,		Identical Assets		Inputs		Inputs
Financial Assets	2020		(Level 1)		(Level 2)		(Level 3)
Cash equivalents:
Money market funds	$	139,682	$	139,682	$	—	$	—
Marketable securities:
U.S. Treasuries		180,373		180,373		—		—
Government agency securities		107,645		—		107,645		—
Commercial paper		41,904		—		41,904
Corporate bonds		42,170		—		42,170
Restricted cash and other non-current assets:
Money market funds		3,877		3,877		—		—
Total financial assets	$	515,651	$	323,932	$	191,719	$	—

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Accrued Expenses (Tables)

3 Months Ended

Mar. 31, 2021

Accrued Expenses

Schedule of accrued expenses

Accrued expenses consisted of the following (in thousands):

	As of
	March 31,		December 31,
	2021		2020
External research and development expenses	$	6,795	$	12,820
Employee related expenses		4,439		5,323
Intellectual property and patent related fees		2,320		4,240
Professional service expenses		660		533
Other expenses		505		359
Sublicensing expenses		413		771
Total accrued expenses	$	15,132	$	24,046

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Property and Equipment, net (Tables)

3 Months Ended

Mar. 31, 2021

Property and Equipment, net

Schedule of property and equipment, net

Property and equipment, net consisted of the following (in thousands):

	As of
	March 31,		December 31,
	2021		2020
Laboratory equipment	$	18,282	$	18,433
Leasehold improvements		5,341		4,967
Construction-in-progress		1,245		500
Computer equipment		858		858
Furniture and office equipment		239		239
Software		118		118
Total property and equipment		26,083		25,115
Less: accumulated depreciation		(11,988)		(11,095)
Property and equipment, net	$	14,095	$	14,020

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Collaboration and Profit-Sharing Agreements (Tables)

3 Months Ended

Mar. 31, 2021

Collaboration and Profit-Sharing Agreements

Schedule of accounts receivable and contract liabilities

The following table presents changes in the Company’s accounts receivable and contract liabilities for the three months ended March 31, 2021 (in thousands):

For the three months ended March 31, 2021	Balance at December 31, 2020		Additions		Deductions		Balance at March 31, 2021
Accounts receivable	$	6,048	$	316	$	(5,692)	$	672
Contract liabilities:
Deferred revenue	$	94,927	$	150	$	(5,706)	$	89,371

Schedule of change in contract assets and contract liabilities

During the three months ended March 31, 2021, the Company recognized the following collaboration revenue (in thousands):

	Three Months Ended
Revenue recognized in the period from:	March 31, 2021
Amounts included in deferred revenue at the beginning of the period	$	5,706
Performance obligations satisfied in previous periods	$	—

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Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2021

Stock-Based Compensation

Schedule of stock-based compensation expense

Total compensation cost recognized for all stock-based compensation awards in the condensed consolidated statements of operations was as follows (in thousands):

	Three Months Ended
	March 31,
	2021		2020
Research and development	$	3,966	$	3,057
General and administrative		8,238		3,163
Total stock-based compensation expense	$	12,204	$	6,220

Schedule of changes in unvested restricted stock

The following is a summary of restricted stock and restricted stock unit awards activity for the three months ended March 31, 2021:

		Weighted
		Average
		Grant Date
		Fair Value
	Shares	Per Share
Unvested restricted stock and restricted stock unit awards as of December 31, 2020	507,450	$	27.35
Issued	424,017	$	52.49
Vested	(79,397)	$	27.48
Forfeited	(54,036)	$	32.69
Unvested restricted stock and restricted stock unit awards as of March 31, 2021	798,034	$	40.94

Schedule of stock option activity

The following is a summary of stock option activity for the three months ended March 31, 2021:

		Weighted Average		Remaining	Aggregate Intrinsic
	Shares	Exercise Price		Contractual Life (years)	Value (in thousands)
Outstanding at December 31, 2020	3,912,257	$	27.26	7.9	$	167,640
Granted	913,803	$	46.42
Exercised	(501,162)	$	23.95
Cancelled	(488,579)	$	28.19
Outstanding at March 31, 2021	3,836,319	$	32.14	7.1	$	43,349
Exercisable at March 31, 2021	1,503,421	$	25.21	4.3	$	25,238

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Net Income (Loss) per Share (Tables)

3 Months Ended

Mar. 31, 2021

Net Income (Loss) per Share

Schedule of anti-dilutive common stock equivalents

The following common stock equivalents were excluded from the calculation of diluted net loss per share allocable to common stockholders because their inclusion would have been anti-dilutive:

	Three Months Ended
	March 31,
	2021	2020
Unvested restricted stock and restricted stock unit awards	798,034	638,054
Outstanding stock options	3,836,319	4,862,947
Total	4,634,353	5,501,001

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Nature of Business (Details) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended
	Feb. 28, 2021	Jan. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Liquidity
Proceeds from offering of common stock, net of issuance costs			$ 249,469
Accumulated deficit			$ 721,925	$ 665,197
Public Offering
Liquidity
Number of common stock issued		3,500,000
Aggregate net proceeds		$ 216,900
Overallotment Option
Liquidity
Number of common stock issued	525,000
Aggregate net proceeds	$ 32,600

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Cash Equivalents and Marketable Securities (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021 USD ($) security item	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)
Cash Equivalents and Marketable Securities
Amortized Cost	$ 723,296		$ 511,820
Gross Unrealized Gains	15		18
Gross Unrealized Losses	(88)		(64)
Fair Value	$ 723,223		511,774
Equity securities included in other non-current assets:
Gross Unrealized Gains		$ 7,333
Number of securities in an unrealized loss position for more than 12 months | item	0
Number of noncurrent securities | security	44
Noncurrent marketable securities	$ 97,890		109,664
Realized gains (losses) on available-for-sale securities	0	$ 0
U.S. Treasuries
Cash Equivalents and Marketable Securities
Amortized Cost	81,255		180,376
Gross Unrealized Gains	7		8
Gross Unrealized Losses	(2)		(11)
Fair Value	81,260		180,373
Government agency securities
Cash Equivalents and Marketable Securities
Amortized Cost	154,022		107,665
Gross Unrealized Gains	7
Gross Unrealized Losses	(41)		(20)
Fair Value	153,988		107,645
Corporate notes/bonds
Cash Equivalents and Marketable Securities
Amortized Cost	50,249
Gross Unrealized Losses	(41)
Fair Value	50,208
Equity securities included in other non-current assets:
Amortized Cost			42,185
Gross Unrealized Gains			10
Gross Unrealized Losses			(25)
Fair Value			42,170
Commercial paper
Cash Equivalents and Marketable Securities
Amortized Cost	92,852		41,912
Gross Unrealized Gains	1
Gross Unrealized Losses	(4)		(8)
Fair Value	92,849		41,904
Money market funds
Cash Equivalents and Marketable Securities
Amortized Cost	344,918		139,682
Fair Value	$ 344,918		$ 139,682

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Fair Value Measurements - Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financial Assets
Marketable securities	$ 723,223	$ 511,774
U.S. Treasuries
Financial Assets
Marketable securities	81,260	180,373
Commercial paper
Financial Assets
Marketable securities	92,849	41,904
Corporate notes/bonds
Financial Assets
Equity securities		42,185
Marketable securities	50,208
Money market funds
Financial Assets
Marketable securities	344,918	139,682
Recurring
Financial Assets
Total financial assets	727,100	515,651
Recurring | U.S. Treasuries
Financial Assets
Marketable securities	81,260	180,373
Recurring | Government agency securities
Financial Assets
Marketable securities	153,988	107,645
Recurring | Commercial paper
Financial Assets
Marketable securities	92,849	41,904
Recurring | Corporate notes/bonds
Financial Assets
Marketable securities	50,208	42,170
Recurring | Money market funds
Financial Assets
Cash and cash equivalents	344,918	139,682
Recurring | Level 1
Financial Assets
Total financial assets	430,055	323,932
Recurring | Level 1 | U.S. Treasuries
Financial Assets
Marketable securities	81,260	180,373
Recurring | Level 1 | Money market funds
Financial Assets
Cash and cash equivalents	344,918	139,682
Recurring | Level 2
Financial Assets
Total financial assets	297,045	191,719
Recurring | Level 2 | Government agency securities
Financial Assets
Marketable securities	153,988	107,645
Recurring | Level 2 | Commercial paper
Financial Assets
Marketable securities	92,849	41,904
Recurring | Level 2 | Corporate notes/bonds
Financial Assets
Marketable securities	$ 50,208	$ 42,170

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Accrued Expenses (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Accrued Expenses
External research and development expenses	$ 6,795	$ 12,820
Employee related expenses	4,439	5,323
Intellectual property and patent related fees	2,320	4,240
Professional service expenses	660	533
Other expenses	505	359
Sublicensing expenses	413	771
Total accrued expenses	$ 15,132	$ 24,046

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Property and Equipment, net (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Property and equipment disclosures
Total property and equipment	$ 26,083	$ 25,115
Less: accumulated depreciation	(11,988)	(11,095)
Property and equipment, net	14,095	14,020
Laboratory equipment
Property and equipment disclosures
Total property and equipment	18,282	18,433
Leasehold improvements
Property and equipment disclosures
Total property and equipment	5,341	4,967
Construction-in-progress
Property and equipment disclosures
Total property and equipment	1,245	500
Computer equipment
Property and equipment disclosures
Total property and equipment	858	858
Furniture and office equipment
Property and equipment disclosures
Total property and equipment	239	239
Software
Property and equipment disclosures
Total property and equipment	$ 118	$ 118

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Commitments and Contingencies - Licensor Expense Reimbursement (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Licensor Expense Reimbursement
Commitments and contingencies
Expense for prosecution and maintenance of patent rights	$ 3.8	$ 3.8

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Collaboration and Profit-Sharing Agreements - Allegran pharmaceuticals strategic alliance and profit sharing agreement (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Collaboration and Profit-Sharing Agreements
Revenue recognized	$ 5,706
Collaboration and other research and development revenues	6,499	$ 5,723
Deferred revenue	$ 89,371		$ 94,927

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Collaboration and Profit-Sharing Agreements - Revenue Recognition (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($)
Accounts receivable
Accounts receivable, Balance at Beginning of Period	$ 6,048
Accounts Receivable, Additions	316
Accounts Receivable, Deductions	(5,692)
Accounts receivable, Balance at End of Period	672
Contract liabilities:
Deferred Revenue, Balance at Beginning of Period	94,927
Deferred revenue, Additions	150
Deferred revenue, Deductions	(5,706)
Deferred Revenue, Balance at End of Period	$ 89,371

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Collaboration and Profit-Sharing Agreements - Contract Assets and Liability (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($)
Change in contract asset and contract liability balances
Amounts included in deferred revenue at the beginning of the period	$ 5,706

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Stock-Based Compensation - Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Stock-based compensation disclosures
Compensation expense	$ 12,204	$ 6,220
Research and development
Stock-based compensation disclosures
Compensation expense	3,966	3,057
General and administrative
Stock-based compensation disclosures
Compensation expense	$ 8,238	$ 3,163

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Stock-Based Compensation - Restricted Stock and Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Weighted Average Grant Date Fair Value
Compensation expense	$ 12,204	$ 6,220
Restricted Stock
Changes in unvested restricted stock
Unvested restricted shares, beginning of period (in shares)	507,450
Issued (in shares)	424,017
Vested (in shares)	(79,397)
Forfeited (in shares)	(54,036)
Unvested restricted shares, end of period(in shares)	798,034		507,450
Weighted Average Grant Date Fair Value
Balance, beginning of period	$ 27.35
Issued (in dollars per share)	52.49
Vested (in dollars per share)	27.48
Forfeited (in dollars per share)	32.69
Balance, ending of period	$ 40.94		$ 27.35
Unrecognized stock-based compensation expense	$ 24,800
Period for recognition	2 years 6 months
Stock options
Weighted Average Grant Date Fair Value
Unrecognized stock-based compensation expense	$ 41,600
Period for recognition	2 years 7 months 6 days
Changes in unvested stock options
Outstanding, beginning of period (in shares)	3,912,257
Granted (in shares)	913,803
Exercised (in shares)	(501,162)
Cancelled (in shares)	(488,579)
Outstanding, end of period (in shares)	3,836,319		3,912,257
Exercisable (in shares)	1,503,421
Outstanding, beginning of period (in dollars per share)	$ 27.26
Granted (in dollars per share)	46.42
Exercised (in dollars per share)	23.95
Cancelled (in dollars per share)	28.19
Outstanding, end of period (in dollars per share)	32.14		$ 27.26
Exercisable (in dollar per share)	$ 25.21
Remaining contractual life	7 years 1 month 6 days		7 years 10 months 24 days
Exercisable, remaining contractual life	4 years 3 months 18 days
Aggregate intrinsic value	$ 43,349		$ 167,640
Exercisable, aggregated intrinsic value	$ 25,238

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Net Income (Loss) per Share - Anti-dilutive (Details) - shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Potentially dilutive securities
Anti-dilutive common stock equivalent shares	4,634,353	5,501,001
Restricted Stock
Potentially dilutive securities
Anti-dilutive common stock equivalent shares	798,034	638,054
Stock options
Potentially dilutive securities
Anti-dilutive common stock equivalent shares	3,836,319	4,862,947

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Label	Element	Value
Fair Value Measurements Recurring [Member] | Money Market Funds [Member]
Restricted Cash and Cash Equivalents	us-gaap_RestrictedCashAndCashEquivalents	$ 3,877,000
Restricted Cash and Cash Equivalents	us-gaap_RestrictedCashAndCashEquivalents	3,877,000
Fair Value Inputs Level1 [Member] | Fair Value Measurements Recurring [Member] | Money Market Funds [Member]
Restricted Cash and Cash Equivalents	us-gaap_RestrictedCashAndCashEquivalents	3,877,000
Restricted Cash and Cash Equivalents	us-gaap_RestrictedCashAndCashEquivalents	$ 3,877,000