CONDENSED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Income
Beginning balance (in shares) at Dec. 31, 2022		198,575,016
Beginning balance at Dec. 31, 2022	$ 98,329	$ 20	$ 878,500	$ (780,137)	$ (54)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock under employee stock purchase plan (in shares)		165,969
Issuance of common stock under employee stock purchase plan	138		138
Issuance of common stock upon exercise of options (in shares)		36,001
Issuance of common stock upon exercise of options	62		62
Issuance of common stock upon vesting of restricted stock units (in shares)		207,773
Issuance of common stock in at the market offering (in shares)		15,477,291
Issuance of common stock in at the market offering	50,719	$ 1	50,718
Stock-based compensation	2,912		2,912
Unrealized (losses) gains on available-for-sale securities	34				34
Net loss	(26,773)			(26,773)
Ending balance (in shares) at Mar. 31, 2023		214,462,050
Ending balance at Mar. 31, 2023	125,421	$ 21	932,330	(806,910)	(20)
Beginning balance (in shares) at Dec. 31, 2023		232,453,190
Beginning balance at Dec. 31, 2023	166,816	$ 23	1,012,773	(846,204)	224
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock under employee stock purchase plan (in shares)		253,312
Issuance of common stock under employee stock purchase plan	$ 1,038		1,038
Issuance of common stock upon exercise of options (in shares)	702,000	701,578
Issuance of common stock upon exercise of options	$ 2,183		2,183
Issuance of common stock upon vesting of restricted stock units (in shares)		551,664
Stock-based compensation	7,616		7,616
Unrealized (losses) gains on available-for-sale securities	(244)				(244)
Net loss	(26,518)			(26,518)
Ending balance (in shares) at Mar. 31, 2024		233,959,744
Ending balance at Mar. 31, 2024	$ 150,891	$ 23	$ 1,023,610	$ (872,722)	$ (20)