Cash Equivalents and Marketable Securities (Tables)

6 Months Ended

Jun. 30, 2018

Cash equivalents and marketable securities consisted of the following at June 30, 2018 and December 31, 2017 (in thousands):


			Unrealized		Unrealized		Fair
June 30, 2018	Amortized Cost		Gains		Losses		Value
Cash equivalents:
Money market funds	$	46,386	$	—	$	—	$	46,386
Overnight repurchase agreements		68,000		—		—		68,000
Marketable Securities:
U.S. treasury obligations		9,987		—		(7)		9,980
Total:	$	124,373	$	—	$	(7)	$	124,366


			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