Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Assets and liabilities measured at fair value [Abstract]
Money market funds	$ 2,780		$ 3,240
Foreign exchange contracts - Assets	83		201
Total assets	2,863		3,441
Liability awards	(272)		(242)
Contingent consideration			(1,701)
Total liabilities	(272)		(1,943)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, January 1, 2017	1,701
Payments made on contingent liabilities	(1,701)
Change in fair value	0	$ (254)
Balance, March 31, 2017	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets and liabilities measured at fair value [Abstract]
Money market funds	2,780		3,240
Foreign exchange contracts - Assets	0		0
Total assets	2,780		3,240
Contingent consideration			0
Total liabilities	0		0
Significant Other Observable Inputs (Level 2) [Member]
Assets and liabilities measured at fair value [Abstract]
Money market funds	0		0
Foreign exchange contracts - Assets	83		201
Total assets	83		201
Liability awards	(272)		(242)
Contingent consideration			0
Total liabilities	(272)		(242)
Significant Unobservable Inputs (Level 3) [Member]
Assets and liabilities measured at fair value [Abstract]
Money market funds	0		0
Foreign exchange contracts - Assets	0		0
Total assets	0		0
Contingent consideration			(1,701)
Total liabilities	$ 0		$ (1,701)