Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2019

Fair Value Disclosures [Abstract]

Assets and Liabilities Measured at Fair Value on a Recurring Basis

The following table summarizes the financial assets and liabilities required to be measured at fair value on a recurring basis as of June 30, 2019 (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	$	3,099	$	—	$	—
Treasury bills	—		307,490		—
Corporate bonds	—		278,991		—
Asset-backed securities	—		145,432		—
Sovereign bonds	—		20,823		—
Agency bonds	—		13,686		—
Municipal bonds	—		6,097		—
Economic hedge forward contracts	—		20		—
Liabilities:
Economic hedge forward contracts	—		13		—
Contingent consideration liabilities	—		—		1,691

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

The following table summarizes the activity for the Company's liability measured at fair value using Level 3 inputs for the six-month period ended June 30, 2019 (in thousands):

Balance as of December 31, 2018	$	2,554
Fair value adjustment to GVi contingent consideration	(1,019		)
Fair value adjustment to Chiaro contingent consideration	156
Balance as of June 30, 2019	$	1,691