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Income Taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Tax Credit Carryforward [Line Items]
General business credit	$ 9
Foreign tax credit carry-forwards	2,345	$ 2,345
Valuation allowance increase	3,980
Interest and penalties	61	11
Non-current income taxes payable	208	$ 147
Decrease in unrecognized tax benefits is reasonably possible	25
Federal
Tax Credit Carryforward [Line Items]
Operating loss carryforwards	9,180
Federal | Research Tax Credit Carryforward
Tax Credit Carryforward [Line Items]
Unrecognized excess tax benefit	5,631
State Tax Authority
Tax Credit Carryforward [Line Items]
Operating loss carryforwards	12,317
Unrecognized excess tax benefit	86
State Tax Authority | Research Tax Credit Carryforward
Tax Credit Carryforward [Line Items]
Unrecognized excess tax benefit	$ 4,772

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