Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Preferred Stock Series X redeemable convertible preferred stock	Common Stock	Additional paid-in capital	Accumulated Deficit	Accumulated other comprehensive loss	Total
Balance, beginning of period at Dec. 31, 2019	$ 0	$ 12	$ 259,305	$ (223,597)	$ 0
Balance, beginning of period (in shares) at Dec. 31, 2019	0	12,433,600
Increase (Decrease) in Shareholders' Equity
Issuance of common stock in a public offering, net of issuance costs			24,554
Issuance of common stock for at-the-market offerings		$ 2	7,328
Issuance of common stock for at-the-market offerings (in shares)		1,100,001
Issuance of common stock and warrants in public offerings		$ 5
Issuance of common stock and warrants in public offerings (in shares)		5,290,000
Stock-based compensation expense			710
Net loss				(17,460)		$ (17,460)
Realized loss on short-term investments					1	1
Balance, end of period at Jun. 30, 2020		$ 19	291,897	(241,057)	1	50,860
Balance, end of period (in shares) at Jun. 30, 2020		18,823,601
Balance, beginning of period at Mar. 31, 2020	$ 0	$ 18	285,257	(231,549)	(15)
Balance, beginning of period (in shares) at Mar. 31, 2020	0	17,897,172
Increase (Decrease) in Shareholders' Equity
Issuance of common stock for at-the-market offerings		$ 1	6,269
Issuance of common stock for at-the-market offerings (in shares)		926,429
Stock-based compensation expense			371
Net loss				(9,508)		(9,508)
Realized loss on short-term investments					16	16
Balance, end of period at Jun. 30, 2020		$ 19	291,897	(241,057)	$ 1	50,860
Balance, end of period (in shares) at Jun. 30, 2020		18,823,601
Balance, beginning of period at Dec. 31, 2020	$ 0	$ 20	301,546	(260,897)		$ 40,669
Balance, beginning of period (in shares) at Dec. 31, 2020	0	20,084,337				20,084,337
Increase (Decrease) in Shareholders' Equity
Reclassification of preferred stock to permanent equity	$ 240,881
Reclassification of preferred stock to permanent equity (in shares)	86,077
Conversion of preferred stock into common stock	$ (165,548)
Conversion of preferred stock into common stock (in shares)	(53,532)
Issuance of preferred stock in a private offering of public equity, net of issuance costs			19,565
Issuance of common stock upon acquisition of Quellis		$ 3	8,095
Issuance of common stock upon acquisition of Quellis (in shares)		3,332,669
Issuance of common stock upon the conversion of preferred stock		$ 54	165,495
Issuance of common stock upon the conversion of preferred stock (in shares)		53,531,797
Dividend on convertible preferred stock related to beneficial conversion feature and issuance costs	$ 24,437		(24,437)
Expense related to warrants inherited in acquisition of Quellis			387
Reclassification of warrant liability to additional paid-in capital			3,468
Stock-based compensation expense			1,380
Net loss				(177,550)		$ (177,550)
Balance, end of period at Jun. 30, 2021	$ 99,770	$ 77	475,499	(438,447)		$ 136,899
Balance, end of period (in shares) at Jun. 30, 2021	32,545	76,948,803				76,948,803
Balance, beginning of period at Mar. 31, 2021	$ 0	$ 23	329,813	(430,981)
Balance, beginning of period (in shares) at Mar. 31, 2021	0	23,417,006
Increase (Decrease) in Shareholders' Equity
Reclassification of preferred stock to permanent equity	$ 240,881
Reclassification of preferred stock to permanent equity (in shares)	86,077
Conversion of preferred stock into common stock	$ (165,548)
Conversion of preferred stock into common stock (in shares)	(53,532)
Issuance of common stock upon the conversion of preferred stock		$ 54	165,495
Issuance of common stock upon the conversion of preferred stock (in shares)		53,531,797
Dividend on convertible preferred stock related to beneficial conversion feature and issuance costs	$ 24,437		(24,437)
Expense related to warrants inherited in acquisition of Quellis			146
Reclassification of warrant liability to additional paid-in capital			3,468
Stock-based compensation expense			1,014
Net loss				(7,466)		$ (7,466)
Balance, end of period at Jun. 30, 2021	$ 99,770	$ 77	$ 475,499	$ (438,447)		$ 136,899
Balance, end of period (in shares) at Jun. 30, 2021	32,545	76,948,803				76,948,803