Cash, cash equivalents, short-term investments, and restricted cash and investments (Tables)

9 Months Ended

Sep. 30, 2015

Cash And Cash Equivalents [Abstract]

Summary of Cash, Cash Equivalents and Short-Term investments and Restricted Cash and Investments

The following table summarizes the Company’s cash, cash equivalents, short-term investments, and restricted cash and investments at September 30, 2015 and December 31, 2014 (in thousands):

	September 30,		December 31,
	2015		2014
Cash and cash equivalents:
Cash	$	30,298	$	43,035
Cash equivalents		46,952		—
Cash and cash equivalents	$	77,250	$	43,035
Short-term investments	$	23,302	$	—
Restricted cash and investments:
Restricted cash and investments, current	$	3,062	$	5,504
Restricted cash and investments, non-current		—		15,750
Total restricted cash and investments	$	3,062	$	21,254

Summary of Unrealized Gains and Losses Related to Cash Equivalents and Investments in Marketable Securities

The following table summarizes the Company’s unrealized gains and losses related to its cash equivalents, short-term investments, and restricted cash and investments in marketable securities designated as available-for-sale (in thousands):

	As of September 30, 2015								As of December 31, 2014
			Gross		Gross						Gross		Gross
	Amortized		Unrealized		Unrealized		Fair		Amortized		Unrealized		Unrealized		Fair
	Cost		Gains		Losses		Value		Cost		Gains		Losses		Value
Marketable securities:
Money market accounts	$	46,952	$	—	$	—	$	46,952	$	—	$	—	$	—	$	—
Money market funds		13,442		—		—		13,442		4,587		—		—		4,587
Corporate bonds		5,840		1		(2)		5,839		2,004		6		—		2,010
Government-sponsored enterprise obligations		2,018		1		—		2,019		—		—		—		—
U.S. government securities		1,002		1		—		1,003		—		—		—		—
Commercial papers		999		—		—		999		—		—		—		—
Variable rate demand notes		—		—		—		—		1,700		—		—		1,700
Total	$	70,253	$	3	$	(2)	$	70,254	$	8,291	$	6	$	—	$	8,297
Reported within:
Cash equivalents	$	46,952	$	—	$	—	$	46,952	$	—	$	—	$	—	$	—
Short-term investments		23,301		3		(2)		23,302		—		—		—		—
Restricted cash and investments, non-current		—		—		—		—		8,291		6		—		8,297
Total	$	70,253	$	3	$	(2)	$	70,254	$	8,291	$	6	$	—	$	8,297

Maturities of Marketable Securities

As of September 30, 2015 and December 31, 2014, maturities of marketable securities were as follows (in thousands):

	September 30,		December 31,
	2015		2014
Less than 1 year	$	66,916	$	6,597
Due in 1 to 2 years		3,338		—
Due in 2 to 5 years		—		—
Due after 5 years		—		1,700
Total	$	70,254	$	8,297