Cash Equivalents and Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2018

Cash equivalents and marketable securities, available-for-sale, consisted of the following at March 31, 2018 and December 31, 2017 (in thousands):


			Unrealized		Unrealized		Fair
March 31, 2018	Amortized Cost		Gains		Losses		Value
Cash equivalents:
Money market funds	$	36,334	$	—	$	—	$	36,334
Overnight repurchase agreements		58,000		—		—		58,000
Marketable Securities:
U.S. treasury obligations		27,441		—		(34)		27,407
Total:	$	121,775	$	—	$	(34)	$	121,741


			Unrealized		Unrealized		Fair
December 31, 2017	Amortized Cost		Gains		Losses		Value
Cash equivalents:
Money market funds	$	17,205	$	—	$	—	$	17,205
Overnight repurchase agreements		15,000		—		—		15,000
Marketable Securities:
U.S. treasury obligations		39,886		—		(42)		39,844
Total:	$	72,091	$	—	$	(42)	$	72,049