Condensed Consolidated Statements of Stockholders' Equity (unaudited) - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]	Accumulated other Compressive Loss [Member]
Balances at beginning at Dec. 31, 2020	$ 45,547	$ 5	$ 227,987	$ (182,445)
Balances at beginning (shares) at Dec. 31, 2020		5,307,713
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	1,095		1,095
Issuance of restricted stock units under equity incentive plan (shares)		11,137
Tax withholding payments for net share-settled equity awards	(120)		(120)
Tax withholding payments for net share-settled equity awards (shares)		(3,938)
Net loss	(8,954)			(8,954)
Balances at ending at Mar. 31, 2021	37,568	$ 5	228,962	(191,399)
Balances at end (shares) at Mar. 31, 2021		5,314,912
Balances at beginning at Dec. 31, 2020	45,547	$ 5	227,987	(182,445)
Balances at beginning (shares) at Dec. 31, 2020		5,307,713
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(28,082)
Balances at ending at Sep. 30, 2021	20,203	$ 5	230,725	(210,527)
Balances at end (shares) at Sep. 30, 2021		5,320,432
Balances at beginning at Mar. 31, 2021	37,568	$ 5	228,962	(191,399)
Balances at beginning (shares) at Mar. 31, 2021		5,314,912
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	857		857
Issuance of restricted stock units under equity incentive plan (shares)		2,370
Net loss	(10,988)			(10,988)
Balances at ending at Jun. 30, 2021	27,437	$ 5	229,819	(202,387)
Balances at end (shares) at Jun. 30, 2021		5,317,282
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	906		906
Issuance of restricted stock units under equity incentive plan (shares)		3,150
Net loss	(8,140)			(8,140)
Balances at ending at Sep. 30, 2021	20,203	$ 5	230,725	(210,527)
Balances at end (shares) at Sep. 30, 2021		5,320,432
Balances at beginning at Dec. 31, 2021	17,793	$ 5	231,143	(213,355)
Balances at beginning (shares) at Dec. 31, 2021		5,324,287
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	464		464
Issuance of restricted stock units under equity incentive plan	180		180
Issuance of restricted stock units under equity incentive plan (shares)		18,650
Tax withholding payments for net share-settled equity awards	(16)		(16)
Tax withholding payments for net share-settled equity awards (shares)		(3,683)
Sale of common stock\pre-funded warrants in public offering, net of costs	13,766	$ 3	13,763
Sale of common stock\pre-funded warrants in public offering, net of costs (shares)		2,666,667
Net loss	(5,724)			(5,724)
Foreign currency translation adjustment	(2)				$ (2)
Balances at ending at Mar. 31, 2022	26,461	$ 8	245,534	(219,079)	(2)
Balances at end (shares) at Mar. 31, 2022		8,005,921
Balances at beginning at Dec. 31, 2021	17,793	$ 5	231,143	(213,355)
Balances at beginning (shares) at Dec. 31, 2021		5,324,287
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(18,581)
Foreign currency translation adjustment	(2)
Balances at ending at Sep. 30, 2022	15,200	$ 8	247,130	(231,936)	(2)
Balances at end (shares) at Sep. 30, 2022		8,159,382
Balances at beginning at Mar. 31, 2022	26,461	$ 8	245,534	(219,079)	(2)
Balances at beginning (shares) at Mar. 31, 2022		8,005,921
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	571		571
Net loss	(6,725)			(6,725)
Foreign currency translation adjustment	1				1
Balances at ending at Jun. 30, 2022	20,308	$ 8	246,105	(225,804)	(1)
Balances at end (shares) at Jun. 30, 2022		8,005,921
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	683		683
Sale of common stock\pre-funded warrants in public offering, net of costs	342		342
Sale of common stock\pre-funded warrants in public offering, net of costs (shares)		104,773
Exercise of common stock warrants		48,688
Net loss	(6,132)			(6,132)
Foreign currency translation adjustment	(1)				(1)
Balances at ending at Sep. 30, 2022	$ 15,200	$ 8	$ 247,130	$ (231,936)	$ (2)
Balances at end (shares) at Sep. 30, 2022		8,159,382