Condensed Statements of Stockholders' Deficit - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Beginning balance (in shares) at Dec. 31, 2021		60,879,496
Beginning balance at Dec. 31, 2021	$ (196,944)	$ 61	$ 964,401	$ (1,106,377)	$ (31)	$ (54,998)
Increase (Decrease) in Stockholders' Equity
Vesting of restricted stock units and performance-based restricted stock units (in shares)		55,286
Vesting of ESPP Shares (in shares)		123,785
Vesting of ESPP Shares	431		431
Stock-based compensation	4,436		4,436
Other comprehensive gain (loss)	(232)				(232)
Net loss	(56,731)			(56,731)
Ending balance (in shares) at Mar. 31, 2022		61,058,567
Ending balance at Mar. 31, 2022	(249,040)	$ 61	969,268	(1,163,108)	(263)	(54,998)
Beginning balance (in shares) at Dec. 31, 2022		74,570,198
Beginning balance at Dec. 31, 2022	(323,778)	$ 75	1,071,183	(1,340,036)	(2)	(54,998)
Increase (Decrease) in Stockholders' Equity
Vesting of restricted stock units and performance-based restricted stock units (in shares)		372,117
Vesting of ESPP Shares (in shares)		95,654
Vesting of ESPP Shares	502		502
Stock-based compensation	2,903		2,903
Issuance of common stock, warrants, and pre-funded warrants, net of issuance costs (in shares)		12,205,000
Issuance of common stock, warrants, and pre-funded warrants, net of issuance costs	52,428	$ 12	52,416
Other comprehensive gain (loss)	1				1
Net loss	(61,719)			(61,719)
Ending balance (in shares) at Mar. 31, 2023		87,242,969
Ending balance at Mar. 31, 2023	$ (329,663)	$ 87	$ 1,127,004	$ (1,401,755)	$ (1)	$ (54,998)