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 Income (Loss) [Member]
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
Foreign currency translation adjustment	(2)				$ (2)
Net loss	(5,724)			(5,724)
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]
Foreign currency translation adjustment	(2)
Net loss	(18,581)
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
Foreign currency translation adjustment	1				1
Net loss	(6,725)			(6,725)
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 (shares)		48,688
Foreign currency translation adjustment	(1)				(1)
Net loss	(6,132)			(6,132)
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 Dec. 31, 2022	10,348	$ 8	247,762	(237,422)
Balances at beginning (shares) at Dec. 31, 2022		8,159,382
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	495		495
Issuance of restricted stock units under equity incentive plan	136		136
Issuance of restricted stock units under equity incentive plan (shares)		9,534
Tax withholding payments for net share-settled equity awards (shares)		(128)
Foreign currency translation adjustment	16				16
Net loss	(8,356)			(8,356)
Balances at ending at Mar. 31, 2023	2,639	$ 8	248,393	(245,778)	16
Balances at end (shares) at Mar. 31, 2023		8,168,788
Balances at beginning at Dec. 31, 2022	10,348	$ 8	247,762	(237,422)
Balances at beginning (shares) at Dec. 31, 2022		8,159,382
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Foreign currency translation adjustment	(1)
Net loss	(27,692)
Balances at ending at Sep. 30, 2023	23,220	$ 15	288,320	(265,114)	(1)
Balances at end (shares) at Sep. 30, 2023		15,467,229
Balances at beginning at Mar. 31, 2023	2,639	$ 8	248,393	(245,778)	16
Balances at beginning (shares) at Mar. 31, 2023		8,168,788
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	1,204		1,204
Issuance of common stock warrants, net of issuance costs	9,973		9,973
Sale of common stock\pre-funded warrants in public offering, net of costs	7,101	$ 2	7,099
Sale of common stock\pre-funded warrants in public offering, net of costs (shares)		1,772,397
Foreign currency translation adjustment	(16)				(16)
Net loss	(8,475)			(8,475)
Balances at ending at Jun. 30, 2023	12,426	$ 10	266,669	(254,253)
Balances at end (shares) at Jun. 30, 2023		9,941,185
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	2,201		2,201
Exercise of common stock warrants	19,445	$ 5	19,440
Exercise of common stock warrants (shares)		5,522,113
Exercise of stock options	10		10
Exercise of stock options (shares)		3,931
Foreign currency translation adjustment	(1)				(1)
Net loss	(10,861)			(10,861)
Balances at ending at Sep. 30, 2023	$ 23,220	$ 15	$ 288,320	$ (265,114)	$ (1)
Balances at end (shares) at Sep. 30, 2023		15,467,229