Cash Equivalents and Investments (Tables)

3 Months Ended

Mar. 31, 2017

Table Text Blocks

Schedule of cash equivalents and investments, available-for-sale

Cash equivalents and investments, available-for-sale, consisted of the following at March 31, 2017 and December 31, 2016 (in thousands):

	Average		Amortized		Unrealized		Unrealized		Fair
March 31, 2017	Maturity		Cost		Gain		Losses		Value
Cash equivalents:
Money market funds			$	50,364	$	—	$	—	$	50,364
Government agency securities				5,991		1		—		5,992
Investments, available-for-sale:
U.S. treasury obligations		321 Days		180,084		—		(115)		179,969
Total			$	236,439	$	1	$	(115)	$	236,325

	Average		Amortized		Unrealized		Unrealized		Fair
December 31, 2016	Maturity		Cost		Gain		Losses		Value
Cash equivalents:
Money market funds			$	52,069	$	—	$	—	$	52,069
Investments, available-for-sale:
U.S. treasury obligations		298 Days		216,167		14		(32)		216,149
Total			$	268,236	$	14	$	(32)	$	268,218