STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive (Loss) Income
Beginning balance (in shares) at Dec. 31, 2021		130,182,535
Beginning balance at Dec. 31, 2021	$ 82,617	$ 13	$ 795,540	$ (712,930)	$ (6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock under employee stock purchase plan (in shares)		308,356
Issuance of common stock under employee stock purchase plan	195		195
Issuance of common stock for services (in shares)		711,675
Issuance of common stock for services	390		390
Issuance of common stock upon exercise of options (in shares)		14,080
Issuance of common stock upon exercise of options	7		7
Issuance of common stock upon vesting of restricted stock units (in shares)		3,243,828
Issuance of common stock in at-the-market offering (in shares)		64,114,542
Issuance of common stock in at-the-market offering	71,625	$ 7	71,618
Stock-based compensation	10,750		10,750
Unrealized gains (losses) on available-for-sale securities	(48)				(48)
Net loss	(67,207)			(67,207)
Ending balance (in shares) at Dec. 31, 2022		198,575,016
Ending 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)		435,708
Issuance of common stock under employee stock purchase plan	808		808
Issuance of common stock for services (in shares)		86,095
Issuance of common stock for services	337		337
Issuance of common stock upon exercise of options (in shares)		225,988
Issuance of common stock upon exercise of options	365		365
Issuance of common stock upon vesting of restricted stock units (in shares)		855,642
Issuance of common stock in at-the-market offering (in shares)		32,274,741
Issuance of common stock in at-the-market offering	119,236	$ 3	119,233
Stock-based compensation	13,530		13,530
Unrealized gains (losses) on available-for-sale securities	278				278
Net loss	(66,067)			(66,067)
Ending balance (in shares) at Dec. 31, 2023		232,453,190
Ending 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)		479,609
Issuance of common stock under employee stock purchase plan	2,227		2,227
Issuance of common stock for services (in shares)		40,549
Issuance of common stock for services	$ 257		257
Issuance of common stock upon exercise of options (in shares)	2,654,000	2,654,370
Issuance of common stock upon exercise of options	$ 5,911	$ 1	5,910
Issuance of common stock upon vesting of restricted stock units (in shares)		2,388,107
Stock-based compensation	37,381		37,381
Unrealized gains (losses) on available-for-sale securities	(167)				(167)
Net loss	(39,136)			(39,136)
Ending balance (in shares) at Dec. 31, 2024		238,015,825
Ending balance at Dec. 31, 2024	$ 173,289	$ 24	$ 1,058,548	$ (885,340)	$ 57