Consolidated Statement of Stockholders' Equity (Deficit) - USD ($) $ in Thousands	Common Stock	Additional Paid in Capital	Accumulated deficit	Accumulated other comprehensive (loss) income	Total
Balance at Dec. 31, 2020	$ 124	$ 434,593	$ (428,556)	$ 14	$ 6,175
Balance (in shares) at Dec. 31, 2020	12,396,219
Increase (Decrease) in Stockholders' Equity (Deficit)
Net loss			(8,946)		(8,946)
Other comprehensive loss				(12)	(12)
Exercise of stock options		24			24
Exercise of stock options (in shares)	4,642
Stock-based compensation		125			125
Issuance of common stock, net	$ 32	35,115			35,147
Issuance of common stock, net (in shares)	3,220,075
Shares issued in connection with reverse stock split	104
Issuance of common stock upon exercise of warrants	$ 2	478			480
Issuance of common stock upon exercise of warrants (in shares)	160,000
Balance at Jun. 30, 2021	$ 158	470,335	(437,502)	2	32,993
Balance (in shares) at Jun. 30, 2021	15,781,040
Balance at Mar. 31, 2021	$ 158	470,268	(433,271)	(2)	37,153
Balance (in shares) at Mar. 31, 2021	15,779,160
Increase (Decrease) in Stockholders' Equity (Deficit)
Net loss			(4,231)		(4,231)
Other comprehensive loss				4	4
Exercise of stock options		7			7
Exercise of stock options (in shares)	1,776
Stock-based compensation		60			60
Shares issued in connection with reverse stock split	104
Balance at Jun. 30, 2021	$ 158	470,335	(437,502)	2	32,993
Balance (in shares) at Jun. 30, 2021	15,781,040
Balance at Dec. 31, 2021	$ 209	490,644	(444,719)	(14)	$ 46,120
Balance (in shares) at Dec. 31, 2021	20,895,563				20,895,563
Increase (Decrease) in Stockholders' Equity (Deficit)
Net loss			(8,146)		$ (8,146)
Other comprehensive loss				(27)	(27)
Stock-based compensation		537			537
Balance at Jun. 30, 2022	$ 209	491,181	(452,865)	(41)	$ 38,484
Balance (in shares) at Jun. 30, 2022	20,895,563				20,895,563
Balance at Mar. 31, 2022	$ 209	490,940	(448,841)	(21)	$ 42,287
Balance (in shares) at Mar. 31, 2022	20,895,563
Increase (Decrease) in Stockholders' Equity (Deficit)
Net loss			(4,024)		(4,024)
Other comprehensive loss				(20)	(20)
Stock-based compensation		241			241
Balance at Jun. 30, 2022	$ 209	$ 491,181	$ (452,865)	$ (41)	$ 38,484
Balance (in shares) at Jun. 30, 2022	20,895,563				20,895,563