Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2016

Fair Value Disclosures [Abstract]

Financial Assets or Liabilities Measured at Fair Value on Recurring Basis

In accordance with the fair value hierarchy, the following table shows the fair value as of September 30, 2016 and December 31, 2015 of those financial assets and liabilities that are measured at fair value on a recurring basis.

	Quoted Prices in Active Markets (Level 1)		Other Observable Inputs (Level 2)		Unobservable Inputs (Level 3)		Total Fair Value
As of September 30, 2016:
Cash equivalents:
Money market funds	$	16,521	$	—	$	—	$	16,521
Corporate commercial paper, bonds and notes	—		1,250		—		1,250
Municipal bonds	—		330		—		330
Short-term investments:
Corporate commercial paper, stock, bonds and notes	—		32,684		—		32,684
Total assets at fair value	$	16,521	$	34,264	$	—	$	50,785

	Quoted Prices in Active Markets (Level 1)		Other Observable Inputs (Level 2)		Unobservable Inputs (Level 3)		Total Fair Value
As of December 31, 2015:
Cash equivalents:
Money market funds	$	13,568	$	—	$	—	$	13,568
Corporate commercial paper, bonds and notes	2,001		7,998		—		9,999
Municipal bonds	—		7,850		—		7,850
Short-term investments:
Corporate commercial paper, stock, bonds and notes	2,644		46,456		—		49,100
Total assets at fair value	$	18,213	$	62,304	$	—	$	80,517