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Income Tax - Income tax reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Effective Tax Rate Reconciliation [Abstract]
Computed "Expected" Income Tax Expense									$ (1,674)	$ (892)
Permanent differences, net									(117)	(118)
Foreign tax rate differential									(11)	23
State income taxes, net of federal income tax benefit									(121)	(103)
Non-deductible stock compensation expense									(329)	174
Acquisition costs									438	0
Impact Of Foreign Rate Changes									0	3,159
Tax credits									(242)	(14)
Change in reserve for uncertain tax position									203	(58)
Impact of change to prior year tax accruals									100	72
Impact of adoption of ASU 2016-09									0	(486)
U.S tax on foreign dividends									0	3,149
Foreign withholding taxes									0	38
Conversion of U.S foreign tax credits from credit to deduction									0	648
Change in valuation allowance allocated to income tax expense (benefit)									(1,850)	(6,152)
Other									(73)	(45)
Income Tax Expense, Total	$ (3,260)	$ (652)	$ (369)	$ 605	$ (464)	$ (19)	$ (115)	$ (7)	$ (3,676)	$ (605)

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