Fair Value Measurements - Reconciliation of Fair Value Measured on Recurring Basis (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2017 USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance as of December 31, 2016	$ 3,421
Payment	(946)
Foreign currency transaction loss	124
Balance as of June 30, 2017	2,599
Other Current Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of contingent consideration	1,300
Other Noncurrent Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of contingent consideration	$ 1,300