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Shareholders' Equity - Shareholders' Equity (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended
Jan. 31, 2022
Mar. 31, 2022
Mar. 31, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance, beginning of period   $ 51,504  
Foreign currency translation adjustment   (11) $ (12)
Net loss   (1,967) (1,655)
Balance, end of period   51,536 48,180
Common stock and additional paid-in capital [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance, beginning of period   72,818 63,378
Issue of common stock and warrants $ 2,000 2,000 0
Share-based compensation expense   35 31
Proceeds from employee stock purchase plan   2 4
Balance, end of period   74,855 63,413
Accumulated other comprehensive loss [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance, beginning of period   (241) (186)
Unrealized loss on available-for-sale securities, net of tax   (28) (2)
Foreign currency translation adjustment   (11) (12)
Balance, end of period   (280) (200)
Accumulated deficit [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance, beginning of period   (21,072) (13,378)
Net loss   (1,967) (1,655)
Balance, end of period   $ (23,039) $ (15,033)