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, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Statutory federal income tax rate									$ 2,631	$ 1,180	$ 649
State income taxes, net of federal effect									(62)	(173)	(240)
Net operating loss limitation									2,975	0	0
Deferred tax true-up									0	(4,103)	8,078
Change in deferred tax asset valuation allowance									(15,338)	4,877	(6,729)
Statutory rate change									13,850	0	0
Foreign tax rate differential									(899)	(712)	(223)
Compensation deduction limitation									0	113	(1,201)
Other, net									(195)	60	35
Total	$ 526	$ 930	$ 879	$ 627	$ 1,263	$ (685)	$ 460	$ 204	$ 2,962	$ 1,242	$ 369