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

3 Months Ended

Mar. 31, 2018

Cash, cash equivalents, restricted cash, and available for sale marketable securities

Cash, cash equivalents and marketable securities

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

	Amortized		Unrealized		Unrealized		Fair
	Cost		Gains		Losses		Value
	(in thousands)
As of March 31, 2018
Money market funds included in cash and cash equivalents	$	139,269	$	—	$	—	$	139,269
Marketable securities:
U.S. Treasury notes		77,862		—		35		77,827
Equity securities		1,220		100		—		1,320
Total marketable securities	$	79,082	$	100	$	35	$	79,147
Total money market funds and marketable securities	$	218,351	$	100	$	35	$	218,416
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 March 31,
	2018		2017
	(in thousands)
Cash and cash equivalents	$	140,371	$	43,604
Restricted cash included in deposits and other noncurrent assets		735		735
Total cash, cash equivalents, and restricted cash	$	141,106	$	44,339