Income Taxes - Schedule of Significant Differences Between the U.S. Federal Statutory Tax Rate and the Effective Income Tax Expense (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Statutory federal income tax rate									$ 981	$ 2,631	$ 1,180
State income taxes, net of federal effect									(285)	(62)	(173)
Net operating loss limitation									0	2,975	0
Adjustment to deferred taxes									939	301	(4,103)
Change in deferred tax asset valuation allowance									(2,867)	(15,338)	4,877
Change in tax law									(992)	13,850	0
Foreign tax rate differential									1,306	(899)	(1,153)
Compensation and equity adjustments									1,474	0	113
Effective Income Tax Rate Reconciliation, Acquisition Earnout Adjustment									(320)	87	60
Effective Income Tax Rate Reconciliation, Other Permanent Differences									183	(682)	0
Effective Income Tax Rate Reconciliation, Withholding Taxes									591	342	441
Effective Income Tax Rate Reconciliation, Changes In Uncertain Tax Provisions									19	(429)	0
Effective Income Tax Rate Reconciliation, Return To Provision Adjustments									257	155	0
Other, net									35	31	0
Total	$ (252)	$ 597	$ 189	$ 787	$ 526	$ 930	$ 879	$ 627	$ 1,321	$ 2,962	$ 1,242