Cash, Cash Equivalents and Investments (Tables)

9 Months Ended

Sep. 30, 2018



	As of September 30, 2018
			Gross		Gross
	Amortized		unrealized		unrealized		Fair
	Cost		gains		losses		Value
Cash and cash equivalents:
Cash and money market funds	$	27,386	$	—	$	—	$	27,386
Commercial paper		10,679		—		(2)		10,677
Total cash and cash equivalents		38,065		—		(2)		38,063
Investments:
Commercial paper		51,647		—		(14)		51,633
Corporate debt securities		9,070		—		(2)		9,068
US government & agency securities		16,989		—		(6)		16,983
Total investments		77,706		—		(22)		77,684
Total cash, cash equivalents and investments	$	115,771	$	—	$	(24)	$	115,747
Long-term restricted cash:
Cash	$	4,500	$	—	$	—	$	4,500


	As of December 31, 2017
			Gross		Gross
	Amortized		unrealized		unrealized		Fair
	Cost		gains		losses		Value
Cash and cash equivalents:
Cash and money market funds	$	14,858	$	—	$	—	$	14,858
Commercial paper		1,649		—		—		1,649
Total cash and cash equivalents		16,507		—		—		16,507
Investments:
Commercial paper		20,408		—		(14)		20,394
Corporate debt securities		9,043		—		(9)		9,034
US government & agency securities		16,946		—		(9)		16,937
Total investments		46,397		—		(32)		46,365
Total cash, cash equivalents and investments	$	62,904	$	—	$	(32)	$	62,872
Long-term restricted cash:
Cash	$	4,500	$	—	$	—	$	4,500



(in thousands)	Fair Value
Due in one year or less	$	85,383
Due after one year through 5 years		2,978
Total investments	$	88,361