Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2017

Fair Value Disclosures [Abstract]

Summary of Financial Assets Measured at Fair Value on a Recurring Basis

Financial assets measured at fair value on a recurring basis are categorized in the table below based upon the lowest level of significant input to the valuations (in thousands):

	September 30, 2017
	Level 1		Level 2		Level 3		Total
Money market funds	$	1,706	$	—	$	—	$	1,706
	December 31, 2016
	Level 1		Level 2		Level 3		Total
Money market funds	$	2,864	$	—	$	—	$	2,864
U.S. government treasury bills		—		3,008		—		3,008
Corporate bonds and commercial paper		—		5,504		—		5,504
	$	2,864	$	8,512	$	—	$	11,376