Stock-Based Compensation - Schedule of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
AOCI Attributable to Parent [Roll Forward]
Beginning balance	$ 106,502
Net other comprehensive (loss) income, March 31, 2016	628	$ (696)
Ending balance	103,856
Foreign Currency Translation
AOCI Attributable to Parent [Roll Forward]
Beginning balance	(16,651)	(7,363)
Other comprehensive (loss) income before reclassifications	601	(676)
Amounts reclassified from AOCI to Other income (expense), net	0	0
Net other comprehensive (loss) income, March 31, 2016	601	(676)
Ending balance	(16,050)	(8,039)
Unrealized Gain (Loss) on Available for Sale Marketable Securities
AOCI Attributable to Parent [Roll Forward]
Beginning balance	0	1
Other comprehensive (loss) income before reclassifications	0	0
Amounts reclassified from AOCI to Other income (expense), net	0	0
Net other comprehensive (loss) income, March 31, 2016	0	0
Ending balance	0	1
Unrealized Gain (Loss) on Available for Sale Marketable Securities
AOCI Attributable to Parent [Roll Forward]
Beginning balance	(158)	(238)
Other comprehensive (loss) income before reclassifications	5	(45)
Amounts reclassified from AOCI to Other income (expense), net	22	25
Net other comprehensive (loss) income, March 31, 2016	27	(20)
Ending balance	(131)	(258)
Total Accumulated Other Comprehensive Loss
AOCI Attributable to Parent [Roll Forward]
Beginning balance	(16,809)	(7,600)
Other comprehensive (loss) income before reclassifications	606	(721)
Amounts reclassified from AOCI to Other income (expense), net	22	25
Net other comprehensive (loss) income, March 31, 2016	628	(696)
Ending balance	$ (16,181)	$ (8,296)