Fair value disclosures (Tables)

9 Months Ended

Sep. 30, 2017

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, 2017								As of December 31, 2016
	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
Cash equivalents and short-term investments:
Money market funds	$	11,530	$	—	$	—	$	11,530	$	199	$	—	$	—	$	199
U.S. government securities	751		—		—		751		4,998		—		—		4,998
Money market accounts	—		4,812		—		4,812		—		23,809		—		23,809
Corporate debt securities	—		—		—		—		—		9,439		—		9,439
Government agency securities	—		—		—		—		—		3,757		—		3,757
Sovereign government bonds	—		—		—		—		—		622		—		622
Total	$	12,281	$	4,812	$	—	$	17,093	$	5,197	$	37,627	$	—	$	42,824
Foreign currency forward contracts*	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Mutual funds held in Rabbi Trust, recorded in other long-term assets	$	927	$	—	$	—	$	927	$	622	$	—	$	—	$	622

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*The fair value of the Company’s foreign currency forward contract was immaterial as of September 30, 2017 and December 31, 2016.

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, 2017								As of December 31, 2016
	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
Rusnano payment derivative	$	—	$	—	$	389	$	389	$	—	$	—	$	389	$	389