STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid In Capital	Accumulated Deficit
Balance at Dec. 31, 2020	$ 123,982	$ 215	$ 887,868	$ (764,101)
Balance (in shares) at Dec. 31, 2020		214,591,906
Stock-based compensation	9,857		9,857
Exercise of employee stock options	1,037		1,037
Exercise of employee stock options (in shares)		363,109
Restricted stock awards		$ 1	(1)
Restricted stock awards (in shares)		1,601,224
Cancelled restricted common stock (in shares)		(410,435)
Issuance of warrants	788		788
Net loss	(66,957)			(66,957)
Balance at Sep. 30, 2021	68,707	$ 216	899,549	(831,058)
Balance (in shares) at Sep. 30, 2021		216,145,804
Balance at Jun. 30, 2021	88,281	$ 216	896,390	(808,325)
Balance (in shares) at Jun. 30, 2021		215,559,148
Stock-based compensation	2,371		2,371
Restricted stock awards (in shares)		875,000
Cancelled restricted common stock (in shares)		(288,344)
Issuance of warrants	788		788
Net loss	(22,733)			(22,733)
Balance at Sep. 30, 2021	68,707	$ 216	899,549	(831,058)
Balance (in shares) at Sep. 30, 2021		216,145,804
Balance at Dec. 31, 2021	58,057	$ 216	900,693	(842,852)
Balance (in shares) at Dec. 31, 2021		216,127,443
Stock-based compensation	2,651		2,651
Exercise of employee stock options	$ 21		21
Exercise of employee stock options (in shares)	26,250	26,250
Repurchase of common stock	$ (45)			(45)
Repurchase of common stock (in Shares)		(18,750)
Restricted stock awards (in shares)		280,000
Cancelled restricted common stock (in shares)		(232,901)
Net loss	(28,571)			(28,571)
Balance at Sep. 30, 2022	32,113	$ 216	903,365	(871,468)
Balance (in shares) at Sep. 30, 2022		216,182,042
Balance at Jun. 30, 2022	40,180	$ 216	902,536	(862,572)
Balance (in shares) at Jun. 30, 2022		216,174,542
Stock-based compensation	808		808
Exercise of employee stock options	21		21
Exercise of employee stock options (in shares)		26,250
Repurchase of common stock	(45)			(45)
Repurchase of common stock (in Shares)		(18,750)
Net loss	(8,851)			(8,851)
Balance at Sep. 30, 2022	$ 32,113	$ 216	$ 903,365	$ (871,468)
Balance (in shares) at Sep. 30, 2022		216,182,042