Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2018

Fair Value Disclosures [Abstract]

Assets and Liabilities Measured at Fair Value on a Recurring Basis

The following table summarizes the financial assets and liabilities measured at fair value on a recurring basis as of December 31, 2018 (in thousands):

	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Unobservable Inputs (Level 3)
Assets:
Money market instruments	$	3,557	$	—	$	—
Corporate bonds	—		300,437		—
Treasury bills	—		231,237		—
Asset-backed securities	—		132,038		—
Sovereign bonds	—		14,417		—
Agency bonds	—		5,921		—
Municipal bonds	—		5,337		—
Economic hedge forward contracts			1		—
Liabilities:
Economic hedge forward contracts	—		106		—
Contingent consideration liabilities	—		—		2,544

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation

The following table summarizes the activity for the Company's liabilities measured at fair value using Level 3 inputs (in thousands):

Balance as of December 31, 2016	$	4,173
Payment of EnShape contingent consideration	(1,401		)
Payment of Manatee contingent consideration	(525		)
Contingent consideration resulting from GVi acquisition	1,299
Fair value adjustment to Manatee contingent consideration	(325		)
Fair value adjustment to Chiaro contingent consideration	15
Fair value adjustment to GVi contingent consideration	282
Foreign exchange rate changes	39
Balance as of December 31, 2017	3,557
Fair value adjustment to Manatee contingent consideration	(1,350		)
Fair value adjustment to Chiaro contingent consideration	282
Fair value adjustment to GVi contingent consideration	1,065
Payment of GVi contingent consideration	(1,000		)
Balance as of December 31, 2018	$	2,554