Condensed Consolidated Statements of Redeemable Convertible Preferred Stock and 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
Beginning balance at Dec. 31, 2020		$ 4	$ 301,562	$ (260,897)		$ 40,669
Beginning balance (in shares) at Dec. 31, 2020		3,347,386
Increase (Decrease) in Shareholders' Equity
Issuance of preferred stock in a private offering of public equity, net of issuance costs			19,565			19,565
Issuance of common stock upon acquisition of Quellis			8,098			8,098
Issuance of common stock upon acquisition of Quellis (in shares)		555,444
Expense related to warrants inherited in acquisition of Quellis			241			241
Stock-based compensation expense			366			366
Net loss				(170,084)		(170,084)
Ending balance at Mar. 31, 2021		$ 4	329,832	(430,981)		(101,145)
Ending balance (in shares) at Mar. 31, 2021		3,902,830
Beginning balance at Dec. 31, 2021	$ 96,398	$ 13	481,709	(455,809)	$ 0	122,311
Beginning balance (in shares) at Dec. 31, 2021	31,455	13,016,955
Increase (Decrease) in Shareholders' Equity
Expense related to warrants inherited in acquisition of Quellis			1,542			1,542
Stock-based compensation expense			1,209			1,209
Net loss				(15,323)		(15,323)
Unrealized loss on short-term investments					(53)	(53)
Realized loss on short-term investments						(53)
Ending balance at Mar. 31, 2022	$ 96,398	$ 13	$ 484,460	$ (471,132)	$ (53)	$ 109,686
Ending balance (in shares) at Mar. 31, 2022	31,455	13,016,955