Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2017

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, 2017 and December 31, 2016 are summarized below (in thousands):

	March 31, 2017
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Direct or Indirect Observable Inputs (Level 2)		Total
Assets
Cash equivalents:
Money market funds	$	964	$	—	$	964
Total cash equivalents		964		—		964
Short-term investments:
Corporate commercial paper		—		10,149		10,149
Corporate debt securities		—		11,131		11,131
Total short-term investments		—		21,280		21,280
Total assets measured at fair value	$	964	$	21,280	$	22,244

	December 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	$	2,796	$	—	$	2,796
Corporate commercial paper		—		500		500
Total cash equivalents		2,796		500		3,296
Short-term investments:
Corporate commercial paper		—		11,465		11,465
Corporate debt securities		—		7,423		7,423
Total short-term investments		—		18,888		18,888
Total assets measured at fair value	$	2,796	$	19,388	$	22,184