Fair Value of Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2018

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 March 31, 2018 and December 31, 2017, by level within the fair value hierarchy (in thousands):

	As of March 31, 2018
	Level I		Level II		Level III		FairValue
Financial Assets:
Cash equivalents:
Money market funds	$	84,081		-		-	$	84,081
Commercial paper		-		3,993		-		3,993
US government and US government agencies		-		15,454		-		15,454
Short-term investments:
Commercial paper		-		-		-		-
Corporate debt obligations		-		117,829		-		117,829
US government and US government agencies		-		46,227		-		46,227
Bank deposits		-		479		-		479
Prepaid expenses and other current assets - Forward foreign exchange    contracts		-		175		-		175
Total financial assets	$	84,081	$	184,157		-	$	268,238

	As of December 31, 2017
	Level I		Level II		Level III		Fair Value
Financial Assets:
Cash equivalents:
Money market funds	$	84,144	$	-	$	-	$	84,144
US government and US government agencies				16,364				16,364
Short-term investments:
Commercial paper		-		699		-		699
Corporate debt obligations		-		122,832		-		122,832
US government and US government agencies		-		42,983		-		42,983
Bank deposits		-		479		-		479
Prepaid expenses and other current assets - Forward foreign exchange    contracts		-		551		-		551
Total financial assets	$	84,144	$	183,908	$	-	$	268,052