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Shareholders' Equity - Shareholders' Equity (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Balance, beginning of period |  |  | $ 44,478 |
Foreign currency translation adjustment | $ (8) | $ 9 | (42) | $ (17)
Net loss | (1,937) | (2,098) | (3,784) | (4,447)
Balance, end of period | 40,719 | 48,036 | 40,719 | 48,036
Common stock and additional paid-in capital [Member] |  |  |  |
Balance, beginning of period | 58,577 | 57,940 | 58,537 | 57,857
Share-based compensation expense | 17 | 55 | 54 | 129
Proceeds from employee stock purchase plan | 3 | 7 | 6 | 16
Balance, end of period | 58,597 | 58,002 | 58,597 | 58,002
Accumulated other comprehensive loss [Member] |  |  |  |
Balance, beginning of period | (233) | (137) | (176) | (181)
Unrealized gain (loss) on available-for-sale securities, net of tax | 30 | 84 | 7 | 154
Foreign currency translation adjustment | (8) | 9 | (42) | (17)
Balance, end of period | (211) | (44) | (211) | (44)
Retained earnings (accumulated deficit) [Member] |  |  |  |
Balance, beginning of period | (15,730) | (7,824) | (13,883) | (5,475)
Net loss | (1,937) | (2,098) | (3,784) | (4,447)
Balance, end of period | $ (17,667) | $ (9,922) | $ (17,667) | $ (9,922)

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