Income Taxes, Uncertain Tax Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Uncertain Tax Liabilities, Total [Roll Forward]
Beginning balance	$ 665
Ending balance	1,825	$ 665
Federal [Member]
Tax [Roll Forward]
Increases	833
Ending balance	833
Foreign Tax Authority [Member]
Uncertain Tax Liabilities, Total [Roll Forward]
Beginning balance		413
Increases	1,160	275
Decreases	0	23
Foreign Tax Authority [Member] | China [Member]
Tax [Roll Forward]
Beginning balance	202	225
Increases	14	0
Decreases	0	23
Ending balance	216	202
Interest and Penalties [Roll Forward]
Beginning balance	209	152
Increases	53	57
Decreases	0	0
Ending balance	262	209
Foreign Tax Authority [Member] | Ukraine [Member]
Tax [Roll Forward]
Beginning balance	89	21
Increases	11	68
Decreases	0	0
Ending balance	100	89
Interest and Penalties [Roll Forward]
Beginning balance	28	15
Increases	0	13
Decreases	0	0
Ending balance	28	28
Foreign Tax Authority [Member] | South Korea [Member]
Tax [Roll Forward]
Beginning balance	129	0
Increases	212	129
Decreases	0	0
Ending balance	341	129
Interest and Penalties [Roll Forward]
Beginning balance	8	0
Increases	37	8
Decreases	0	0
Ending balance	$ 45	$ 8