CONDENSED STATEMENTS OF STOCKHOLDERS’ EQUITY (DEFICIT) - USD ($) $ in Thousands	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2020		29,471,854
Beginning balance at Dec. 31, 2020	$ (25,202)	$ 29	$ (24)	$ 235,516	$ (260,723)
Beginning balance, treasury (in shares) at Dec. 31, 2020			(29,967)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock in public offering, net (in shares)		18,400,000
Issuance of common stock, net	60,084	$ 19		60,065
Exercises of stock options (in shares)		110,146
Exercise of stock options	217			217
Stock-based compensation	670			670
Net loss	(27,358)				(27,358)
Ending balance (in shares) at Mar. 31, 2021		47,982,000
Ending balance at Mar. 31, 2021	8,411	$ 48	$ (24)	296,468	(288,081)
Ending balance, treasury (in shares) at Mar. 31, 2021			(29,967)
Beginning balance (in shares) at Dec. 31, 2020		29,471,854
Beginning balance at Dec. 31, 2020	(25,202)	$ 29	$ (24)	235,516	(260,723)
Beginning balance, treasury (in shares) at Dec. 31, 2020			(29,967)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(56,037)
Ending balance (in shares) at Jun. 30, 2021		48,057,720
Ending balance at Jun. 30, 2021	(19,175)	$ 48	$ (24)	297,561	(316,760)
Ending balance, treasury (in shares) at Jun. 30, 2021			(29,967)
Beginning balance (in shares) at Mar. 31, 2021		47,982,000
Beginning balance at Mar. 31, 2021	8,411	$ 48	$ (24)	296,468	(288,081)
Beginning balance, treasury (in shares) at Mar. 31, 2021			(29,967)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock in public offering, net (in shares)		0
Issuance of common stock, net	157			157
Exercises of stock options (in shares)		3,615
Exercise of stock options	6			6
Issuance of common stock under employee stock purchase plan (in shares)		72,105
Issuance of common stock under employee stock purchase plan	202			202
Stock-based compensation	728			728
Net loss	(28,679)				(28,679)
Ending balance (in shares) at Jun. 30, 2021		48,057,720
Ending balance at Jun. 30, 2021	$ (19,175)	$ 48	$ (24)	297,561	(316,760)
Ending balance, treasury (in shares) at Jun. 30, 2021			(29,967)
Beginning balance (in shares) at Dec. 31, 2021	48,190,590	48,220,557
Beginning balance at Dec. 31, 2021	$ (93,034)	$ 48	$ (24)	298,736	(391,794)
Beginning balance, treasury (in shares) at Dec. 31, 2021	(29,967)		(29,967)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock in public offering, net (in shares)		500,000
Issuance of common stock, net	$ 1,183	$ 1		1,182
Stock-based compensation	597			597
Net loss	(11,141)				(11,141)
Ending balance (in shares) at Mar. 31, 2022		48,720,557
Ending balance at Mar. 31, 2022	$ (102,395)	$ 49	$ (24)	300,515	(402,935)
Ending balance, treasury (in shares) at Mar. 31, 2022			(29,967)
Beginning balance (in shares) at Dec. 31, 2021	48,190,590	48,220,557
Beginning balance at Dec. 31, 2021	$ (93,034)	$ 48	$ (24)	298,736	(391,794)
Beginning balance, treasury (in shares) at Dec. 31, 2021	(29,967)		(29,967)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	$ (27,806)
Ending balance (in shares) at Jun. 30, 2022	49,858,116	49,888,083
Ending balance at Jun. 30, 2022	$ (117,398)	$ 50	$ (24)	302,176	(419,600)
Ending balance, treasury (in shares) at Jun. 30, 2022	(29,967)		(29,967)
Beginning balance (in shares) at Mar. 31, 2022		48,720,557
Beginning balance at Mar. 31, 2022	$ (102,395)	$ 49	$ (24)	300,515	(402,935)
Beginning balance, treasury (in shares) at Mar. 31, 2022			(29,967)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock in public offering, net (in shares)		854,677
Issuance of common stock, net	734	$ 1		733
Exercises of stock options (in shares)		0
Exercise of stock options	0			0
Issuance of common stock under employee stock purchase plan (in shares)		312,849
Issuance of common stock under employee stock purchase plan	213			213
Stock-based compensation	715			715
Net loss	$ (16,665)				(16,665)
Ending balance (in shares) at Jun. 30, 2022	49,858,116	49,888,083
Ending balance at Jun. 30, 2022	$ (117,398)	$ 50	$ (24)	$ 302,176	$ (419,600)
Ending balance, treasury (in shares) at Jun. 30, 2022	(29,967)		(29,967)