Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Revision of Prior Period, Accounting Standards Update, Adjustment	Common Stock	Additional Paid-in Capital	Additional Paid-in Capital Revision of Prior Period, Accounting Standards Update, Adjustment	Accumulated Deficit
Balances at beginning (in shares) at Dec. 31, 2020			17,047,584
Balances at beginning at Dec. 31, 2020	$ 2,377	$ (3,107)	$ 170	$ 121,729	$ (3,107)	$ (119,522)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of 2020 senior secured convertible note (in shares)			2,029,589
Conversion of 2020 senior secured convertible notes	14,974		$ 21	14,953
Issuances of common stock:
Public offering of common stock (in shares)			2,127,660
Public offering of common stock	46,785		$ 21	46,764
Share-based compensation (in shares)			185,051
Share-based compensation	2,078		$ 2	2,076
Warrant and option exercises (cash and cashless) (in shares)			2,285,490
Warrant and option exercises (cash and cashless)	465		$ 23	442
Stock Issued During Period, Shares, Employee Stock Purchase Plans			22,918
Issuance of common stock under employee stock purchase plan	224			224
Payments for taxes related to net share settlement of equity awards (in shares)			(32,301)
Payments for taxes related to net share settlement of equity awards	(599)			(599)
Net loss for the year	$ (14,410)					(14,410)
Balance at ending (in shares) at Dec. 31, 2021	23,665,991		23,665,991
Balances at ending at Dec. 31, 2021	$ 48,787		$ 237	182,482		(133,932)
Issuances of common stock:
Share-based compensation (in shares)			476,720
Share-based compensation	4,126		$ 5	4,121
Warrant and option exercises (cash and cashless) (in shares)			403,980
Warrant and option exercises (cash and cashless)	268		$ 4	264
Stock Issued During Period, Shares, Employee Stock Purchase Plans			56,561
Issuance of common stock under employee stock purchase plan	477			477
Payments for taxes related to net share settlement of equity awards (in shares)			(24,269)
Payments for taxes related to net share settlement of equity awards	(336)			(336)
Net loss for the year	$ (16,435)					(16,435)
Balance at ending (in shares) at Dec. 31, 2022	24,578,983		24,578,983
Balances at ending at Dec. 31, 2022	$ 36,887		$ 246	$ 187,008		$ (150,367)