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Shareholders' Equity - Shareholders' Equity (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
Jan. 31, 2022
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Balance, beginning of period       $ 51,504  
Foreign currency translation adjustment   $ (22) $ (4) (45) $ (26)
Net loss   (1,248) (2,169) (3,472) (5,410)
Balance, end of period   50,078 53,765 50,078 53,765
Common stock and additional paid-in capital [Member]          
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Balance, beginning of period   74,885 63,450 72,817 63,378
Issuance of common stock and warrants, net $ 2,000 0 9,288 2,000 9,288
Share-based compensation expense   24 35 90 100
Proceeds from employee stock purchase plan   1 5 3 12
Balance, end of period   74,910 72,778 74,910 72,778
Accumulated other comprehensive loss [Member]          
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Balance, beginning of period   (266) (213) (241) (186)
Unrealized loss on available-for-sale securities, net of tax   0 (8) (2) (13)
Foreign currency translation adjustment   (22) (4) (45) (26)
Balance, end of period   (288) (225) (288) (225)
Accumulated deficit [Member]          
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Balance, beginning of period   (23,296) (16,619) (21,072) (13,378)
Net loss   (1,248) (2,169) (3,472) (5,410)
Balance, end of period   $ (24,544) $ (18,788) $ (24,544) $ (18,788)