Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Assets and liabilities measured at fair value [Abstract]
Money market funds	$ 12,145	$ 16,435
Foreign exchange contracts - Assets	71	141
Total assets	12,216	16,576
Foreign exchange contracts - Liabilities	36	20
Contingent consideration	1,508	2,105
Total liabilities	1,544	2,125
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, January 1, 2017	2,105
Payments made on contingent liabilities	(851)
Change in fair value	254
Balance, March 31, 2017	1,508
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets and liabilities measured at fair value [Abstract]
Money market funds	12,145	16,435
Foreign exchange contracts - Assets	0	0
Total assets	12,145	16,435
Foreign exchange contracts - Liabilities	0	0
Contingent consideration	0	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	71	141
Total assets	71	141
Foreign exchange contracts - Liabilities	36	20
Contingent consideration	0	0
Total liabilities	36	20
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
Foreign exchange contracts - Liabilities	0	0
Contingent consideration	1,508	2,105
Total liabilities	$ 1,508	$ 2,105