Income Taxes, Uncertain Tax Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Federal [Member]
Tax [Roll Forward]
Beginning balance	$ 996	$ 833
Increases	0	163
Decreases	203	0
Ending balance	793	996
Interest and Penalties [Roll Forward]
Beginning balance	4	0
Increases	2	4
Decreases	0	0
Ending balance	6	4
Foreign Tax Authority [Member]
Uncertain Tax Liabilities, Total [Roll Forward]
Beginning balance	2,215	1,825
Increases	195	420
Decreases	222	30
Ending balance	2,188	2,215
Foreign Tax Authority [Member] | China [Member]
Tax [Roll Forward]
Beginning balance	204	216
Increases	0	0
Decreases	3	12
Ending balance	201	204
Interest and Penalties [Roll Forward]
Beginning balance	285	262
Increases	33	23
Decreases	0	0
Ending balance	318	285
Foreign Tax Authority [Member] | Ukraine [Member]
Tax [Roll Forward]
Beginning balance	82	100
Increases	0	0
Decreases	4	18
Ending balance	78	82
Interest and Penalties [Roll Forward]
Beginning balance	72	28
Increases	0	44
Decreases	12	0
Ending balance	60	72
Foreign Tax Authority [Member] | South Korea [Member]
Tax [Roll Forward]
Beginning balance	461	341
Increases	93	120
Decreases	0	0
Ending balance	554	461
Interest and Penalties [Roll Forward]
Beginning balance	111	45
Increases	67	66
Decreases	0	0
Ending balance	$ 178	$ 111