Condensed Consolidated Statement of Convertible Preferred Stock and Stockholders' Equity (Deficit) - USD ($) $ in Thousands	Total	Preferred Stock	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Beginning Balance at Dec. 31, 2020	$ (63,909)	$ 125,160	$ 3	$ 2,616	$ 8	$ (66,536)
Beginning Balance (in shares) at Dec. 31, 2020		179,519,032	2,585,789
Issuance of Series B convertible preferred stock, net of issuance costs of $241		$ 93,759
Issuance of Series B convertible preferred stock, net of issuance costs (in shares)		77,163,022
Vesting of restricted common stock (in shares)			134,409
Exercise of stock options	72			72
Exercise of stock options (in shares)			48,745
Unrealized loss on available-for-sale securities	(1)				(1)
Stock-based compensation	670			670
Net loss	(13,263)					(13,263)
Ending Balance at Mar. 31, 2021	(76,431)	$ 218,919	$ 3	3,358	7	(79,799)
Ending balance (in shares) at Mar. 31, 2021		256,682,054	2,768,943
Beginning Balance at Dec. 31, 2021	$ 357,352	$ 0	$ 49	544,381	(228)	(186,850)
Beginning Balance (in shares) at Dec. 31, 2021	48,511,735	0	48,511,735
Exercise of stock options	$ 505			505
Exercise of stock options (in shares)	143,506		143,506
Unrealized loss on available-for-sale securities	$ (504)				(504)
Stock-based compensation	4,203			4,203
Net loss	(30,166)					(30,166)
Ending Balance at Mar. 31, 2022	$ 331,390	$ 0	$ 49	$ 549,089	$ (732)	$ (217,016)
Ending balance (in shares) at Mar. 31, 2022	48,655,241	0	48,655,241