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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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Amount of increase to additional paid-in capital (APIC) for recognition of cost for award under share-based payment arrangement.

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