Short-term Investments (Tables)

9 Months Ended

Sep. 30, 2015

Short-term Investments [Abstract]

Short-term Investments Measured at Fair Value

As of September 30, 2015, the fair value of the Company’s short-term investments was as follows (in thousands):

	September 30, 2015
	Amortized cost		Unrealized gains		Unrealized loss		Fair value
	(unaudited)
U.S. agency notes	$	25,281	$	3	$	(1)	$	25,283
Corporate bonds		27,027		1		(10)		27,018
Commercial paper		20,313		1		—		20,314
Marketable securities		72,621		5		(11)		72,615
Certificates of deposit		15,000		—		—		15,000
Total short-term investments	$	87,621	$	5	$	(11)	$	87,615

As of December 31, 2014, the fair value of the Company’s short-term investments was as follows (in thousands):

		December 31, 2014
	Amortized cost		Unrealized gains		Unrealized loss		Fair value
U.S. agency notes	$	33,489	$	—	$	(13)	$	33,476
Corporate bonds		44,025		3		(44)		43,984
Commercial paper		31,318		—		(1)		31,317
Marketable securities		108,832		3		(58)		108,777
Certificates of deposit		3,000		—		—		3,000
Total short-term investments	$	111,832	$	3	$	(58)	$	111,777