Cash, cash equivalents, and available for sale marketable securities (Tables)

9 Months Ended

Sep. 30, 2018

Cash, cash equivalents, and available for sale marketable securities

Cash, cash equivalents and marketable securities

Cash, cash equivalents, and marketable securities included the following at September 30, 2018 and December 31, 2017:

	Amortized		Unrealized		Unrealized		Fair
	Cost		Gains		Losses		Value
	(in thousands)
As of September 30, 2018
Money market funds included in cash and cash equivalents	$	41,342	$	—	$	—	$	41,342
Marketable securities:
U.S. Treasury notes		137,504		—		45		137,459
Equity securities		1,220		—		420		800
Total marketable securities	$	138,724	$	—	$	465	$	138,259
Total money market funds and marketable securities	$	180,066	$	—	$	465	$	179,601
As of December 31, 2017
Money market funds included in cash and cash equivalents	$	30,469	$	—	$	—	$	30,469
Marketable securities:
U.S. Treasury notes		137,560		—		38		137,522
Equity securities		1,220		—		120		1,100
Total marketable securities	$	138,780	$	—	$	158	$	138,622
Total money market funds and marketable securities	$	169,249	$	—	$	158	$	169,091

Reconciliation of cash, cash equivalents, and restricted cash

	As of September 30,		As of December 31,
	2018		2017
	(in thousands)
Cash and cash equivalents	$	42,142	$	31,530
Restricted cash included in deposits and other noncurrent assets		735		735
Total cash, cash equivalents, and restricted cash	$	42,877	$	32,265