Accumulated Other Comprehensive Loss - Schedule of Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ 278,101	$ 128,752	$ (36,411)
Other comprehensive income (loss)	(258)	(7)	(104)
Ending Balance	299,513	278,101	128,752
Unrealized Gain (Loss) on Investments, net of tax
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(68)	0
Other comprehensive income (loss)	67	(68)
Ending Balance	(1)	(68)	0
Foreign Currency Translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	53	(8)
Other comprehensive income (loss)	(325)	61
Ending Balance	(272)	53	(8)
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(15)	(8)	96
Ending Balance	$ (273)	$ (15)	$ (8)