Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Payables and Accruals [Abstract]
Payroll taxes	$ 2,406	$ 2,369
Payroll	7,733	4,971
Bonuses	4,470	5,283
Commissions	974	790
Vacation	8,846	7,748
Royalties	1,806	1,499
Value-added tax	2,046	1,797
Other accrued expenses	16,666	13,389
Total	$ 44,947	$ 37,846