Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2015

Fair Value Disclosures [Abstract]

Assets and Liabilities Measured at Fair Value on Recurring Basis

Assets and liabilities measured at fair value on a recurring basis as of September 30, 2015 and December 31, 2014 are summarized below (in thousands):

	September 30, 2015
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Direct or Indirect Observable Inputs (Level 2)		Total
Assets
Cash equivalents:
Money market funds	$	10,192	$	—	$	10,192
Corporate commercial paper		—		1,000		1,000
Corporate debt securities		—		321		321
Total cash equivalents		10,192		1,321		11,513
Short-term investments:
Corporate commercial paper		—		2,496		2,496
Corporate debt securities		—		13,430		13,430
Total short-term investments		—		15,926		15,926
Restricted cash—money market fund		250		—		250
Total assets measured at fair value	$	10,442	$	17,247	$	27,689

	December 31, 2014
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Direct or Indirect Observable Inputs (Level 2)		Total
Assets
Cash equivalents:
Money market funds	$	9,362	$	—	$	9,362
Corporate debt securities		—		1,002		1,002
Total cash equivalents		9,362		1,002		10,364
Short-term investments:
Corporate commercial paper		—		550		550
Corporate debt securities		—		12,713		12,713
Total short-term investments		—		13,263		13,263
Restricted cash—money market fund		250		—		250
Total assets measured at fair value	$	9,612	$	14,265	$	23,877