Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2016

Fair Value Disclosures [Abstract]

Assets and Liabilities Subject to Fair Value Measurements on Recurring Basis

The following table sets forth the Company’s assets and liabilities that were measured at fair value as of December 31, 2016 and 2015, by level within the fair value hierarchy (in thousands):

	As of December 31, 2016
	Level I		Level II		Level III		FairValue
Financial Assets:
Cash equivalents:
Commercial paper		—		6,993		—		6,993
Money market funds		36,708		—		—		36,708
Short-term investments:
Commercial paper		—		14,237		—		14,237
Corporate debt obligations		—		109,715		—		109,715
US government agencies		—		18,950		—		18,950
Bank deposits		—		10,847		—		10,847
Total financial assets	$	36,708	$	160,742	$	—	$	197,450
Financial Liability:
Accrued and other current liabilities - Forward foreign    exchange contracts	$	—	$	639	$	—	$	639

	As of December 31, 2015
	Level I		Level II		Level III		Fair Value
Financial Assets:
Cash equivalents:
Bank deposits	$	—	$	10,253	$	—	$	10,253
Commercial paper		—		13,893		—		13,893
Money market funds		86,200		—		—		86,200
Short-term investments:
Corporate debt obligations		—		86,292		—		86,292
Bank deposits		—		10,263		—		10,263
Total financial assets	$	86,200	$	120,701	$	—	$	206,901
Financial Liability:
Accrued and other current liabilities - Forward foreign    exchange contracts	$	—	$	595	$	—	$	595