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Shareholders' Equity - Shareholders' Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Balance, beginning of period $ 44,478  
Foreign currency translation adjustment (34) $ (27)
Net loss (1,847) (2,349)
Balance, end of period 42,614 49,979
Common stock and additional paid-in capital [Member]    
Balance, beginning of period 58,537 57,857
Share-based compensation expense 37 74
Proceeds from employee stock purchase plan 3 9
Balance, end of period 58,577 57,940
Accumulated other comprehensive loss [Member]    
Balance, beginning of period (176) (181)
Unrealized gain (loss) on available-for-sale securities, net of tax (23) 70
Foreign currency translation adjustment (34) (26)
Balance, end of period (233) (137)
Retained earnings (accumulated deficit) [Member]    
Balance, beginning of period (13,883) (5,475)
Net loss (1,847) (2,349)
Balance, end of period $ (15,730) $ (7,824)