Cash, Cash Equivalents and Marketable Securities (Tables)

9 Months Ended

Sep. 30, 2018

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


			Unrealized		Unrealized		Fair
September 30, 2018	Amortized Cost		Gains		Losses		Value
Cash and Cash equivalents:
Cash and money market funds	$	20,524	$	—	$	—	$	20,524
Overnight repurchase agreements		23,000		—		—		23,000
Marketable Securities:
U.S. treasury obligations		69,720		—		(13)		69,707
Total:	$	113,244	$	—	$	(13)	$	113,231


			Unrealized		Unrealized		Fair
December 31, 2017	Amortized Cost		Gains		Losses		Value
Cash and Cash equivalents:
Cash and 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