Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Assets and liabilities measured at fair value [Abstract]
Money market funds	$ 8,331	$ 16,435
Foreign exchange contracts - Assets	208	141
Total assets	8,539	16,576
Foreign exchange contracts - Liabilities	(4)	(20)
Contingent consideration	(1,552)	(2,105)
Total liabilities	(1,556)	(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	(850)
Change in fair value	297
Balance, March 31, 2017	1,552
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets and liabilities measured at fair value [Abstract]
Money market funds	8,331	16,435
Foreign exchange contracts - Assets	0	0
Total assets	8,331	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	208	141
Total assets	208	141
Foreign exchange contracts - Liabilities	(4)	(20)
Contingent consideration	0	0
Total liabilities	(4)	(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	(1,552)	(2,105)
Total liabilities	$ (1,552)	$ (2,105)