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Shareholders' Equity - Shareholders' Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, beginning of period     $ 49,814  
Foreign currency translation adjustment $ (4) $ 17 (26) $ (25)
Net loss (2,169) (1,260) (5,410) (5,044)
Balance, end of period 53,765 44,250 53,765 44,250
Common stock and additional paid-in capital [Member]        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, beginning of period 63,450 58,597 63,378 58,537
Issue of common stock and warrants 9,288 4,764 9,288 4,764
Share-based compensation expense 35 1 100 55
Proceeds from employee stock purchase plan 5 5 12 11
Balance, end of period 72,778 63,367 72,778 63,367
Accumulated other comprehensive loss [Member]        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, beginning of period (213) (211) (186) (176)
Unrealized loss on available-for-sale securities, net of tax (8) 4 (13) 11
Foreign currency translation adjustment (4) 17 (26) (25)
Balance, end of period (225) (190) (225) (190)
Accumulated deficit [Member]        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, beginning of period (16,619) (17,667) (13,378) (13,883)
Net loss (2,169) (1,260) (5,410) (5,044)
Balance, end of period $ (18,788) $ (18,927) $ (18,788) $ (18,927)