Fair value disclosures (Tables)

9 Months Ended

Sep. 30, 2015

Fair Value Disclosures [Abstract]

Fair Value of Financial Assets

The following table presents the Company's assets that are measured at fair value on a recurring basis (in thousands):

	As of September 30, 2015								As of December 31, 2014
	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
Cash equivalents, short-term investments and restricted investments:
Money market funds	$	13,442	$	—	$	—	$	13,442	$	4,587	$	—	$	—	$	4,587
Time deposits		—		—		—		—		—		—		—		—
Money market accounts		—		46,952		—		46,952		—		—		—		—
Corporate bonds		—		5,839		—		5,839		—		2,010		—		2,010
Government-sponsored enterprise obligations		—		2,019		—		2,019		—		—		—		—
U.S. government securities		1,003		—		—		1,003		—		—		—		—
Commercial papers		—		999		—		999		—		—		—		—
Variable rate demand notes		—		—		—		—		—		1,700		—		1,700
Total	$	14,445	$	55,809	$	—	$	70,254	$	4,587	$	3,710	$	—	$	8,297
Mutual funds held in Rabbi Trust, recorded in other long-term assets	$	411	$	—	$	—	$	411	$	424	$	—	$	—	$	424

Fair Value of Financial Liabilities

The following table presents the Company's liabilities that are measured at fair value on a recurring basis (in thousands):

	As of September 30, 2015								As of December 31, 2014
	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
Penalty payment derivative (Note 10)	$	—	$	—	$	389	$	389	$	—	$	—	$	530	$	530