Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2016

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 March 31, 2016 and December 31, 2015 are summarized below (in thousands):

	March 31, 2016
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Direct or Indirect Observable Inputs (Level 2)		Total
Assets
Cash equivalents:
Money market funds	$	2,268	$	—	$	2,268
Corporate commercial paper		—		1,749		1,749
Corporate debt securities		—		—		—
Total cash equivalents		2,268		1,749		4,017
Short-term investments:
Corporate commercial paper		—		10,735		10,735
Treasury bonds		—		1,008		1,008
Corporate debt securities		—		3,541		3,541
Total short-term investments		—		15,284		15,284
Restricted cash equivalents—money market fund		250		—		250
Total assets measured at fair value	$	2,518	$	17,033	$	19,551

	December 31, 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	$	5,404	$	—	$	5,404
Corporate commercial paper		—		1,500		1,500
Corporate debt securities		—		2,269		2,269
Total cash equivalents		5,404		3,769		9,173
Short-term investments:
Corporate commercial paper		—		6,245		6,245
Treasury bonds		—		1,007		1,007
Corporate debt securities		—		6,028		6,028
Total short-term investments		—		13,280		13,280
Restricted cash equivalents—money market fund		250		—		250
Total assets measured at fair value	$	5,654	$	17,049	$	22,703