Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Accumulated Deficit [Member]
Beginning balance at Dec. 31, 2020	$ 132,086	$ 87	$ 536,568		$ (404,569)
Beginning balance, units at Dec. 31, 2020		87,052,323
Equity-based compensation	6,542		6,542
Sale of common stock, net of issuance costs	134,878	$ 25	134,853
Sale of common stock, net of issuance costs, shares		25,000,000
Exercise of stock options	38		38
Exercise of stock options, shares		10,625
Vesting of restricted stock, units		419,193
Forfeiture of restricted stock awards		(27,820)
Unrealized loss on available-for-sale securities	(11)			$ (11)
Net loss	(35,595)				(35,595)
Ending balance at Jun. 30, 2021	237,938	$ 112	678,001	(11)	(440,164)
Ending balance, units at Jun. 30, 2021		112,454,321
Beginning balance at Mar. 31, 2021	253,000	$ 112	674,357		(421,469)
Beginning balance, units at Mar. 31, 2021		112,446,896
Equity-based compensation	3,635		3,635
Exercise of stock options	9		9
Exercise of stock options, shares		2,475
Vesting of restricted stock, units		6,262
Forfeiture of restricted stock awards		(1,312)
Unrealized loss on available-for-sale securities	(11)			(11)
Net loss	(18,695)				(18,695)
Ending balance at Jun. 30, 2021	237,938	$ 112	678,001	(11)	(440,164)
Ending balance, units at Jun. 30, 2021		112,454,321
Beginning balance at Dec. 31, 2021	208,211	$ 112	684,901	(45)	(476,757)
Beginning balance, units at Dec. 31, 2021		112,498,610
Equity-based compensation	4,426		4,426
Exercise of pre-funded warrants	22		22
Vesting of restricted stock, units		313,257
Issuance of ESPP shares	73		73
Issuance of ESPP shares, shares		152,831
Unrealized loss on available-for-sale securities	(77)			(77)
Net loss	(50,420)				(50,420)
Ending balance at Jun. 30, 2022	162,235	$ 112	689,422	(122)	(527,177)
Ending balance, units at Jun. 30, 2022		112,964,698
Beginning balance at Mar. 31, 2022	185,511	$ 112	687,535	(51)	(502,085)
Beginning balance, units at Mar. 31, 2022		112,781,291
Equity-based compensation	1,814		1,814
Vesting of restricted stock, units		30,576
Issuance of ESPP shares	73		73
Issuance of ESPP shares, shares		152,831
Unrealized loss on available-for-sale securities	(71)			(71)
Net loss	(25,092)				(25,092)
Ending balance at Jun. 30, 2022	$ 162,235	$ 112	$ 689,422	$ (122)	$ (527,177)
Ending balance, units at Jun. 30, 2022		112,964,698