Fair Value of Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2017

Fair Value Disclosures [Abstract]

Summary of Fair Value Hierarchy for Financial Assets

The Company’s fair value hierarchy for its cash equivalents and marketable securities as of September 30, 2017 and December 31, 2016, respectively, was as follows:

September 30, 2017	Level 1		Level 2		Level 3		Total
Money market securities	$	1,524	$	—	$	—	$	1,524
Commercial paper		—		35,141		—		35,141
Federal agency notes		—		11,591		—		11,591
Corporate notes		—		7,501		—		7,501
Pre-refunded municipal bonds (1)		—		2,052		—		2,052
U.S. treasuries		—		1,999		—		1,999
Total	$	1,524	$	58,284	$	—	$	59,808

December 31, 2016	Level 1		Level 2		Level 3		Total
Money market securities	$	1,218	$	—	$	—	$	1,218
Federal agency notes		—		16,810		—		16,810
Commercial paper		—		16,757		—		16,757
Corporate notes		—		15,753		—		15,753
Pre-refunded municipal bonds (1)		—		6,716		—		6,716
U.S. treasuries		—		2,515		—		2,515
Total	$	1,218	$	58,551	$	—	$	59,769

(1) Pre-refunded municipal bonds are collateralized by U.S. treasuries.

Summary of Fair Value Maturities for Financial Asset

The fair value maturities of the Company’s cash equivalents and marketable securities as of September 30, 2017 are as follows:

	Maturities by Period
	Total		Lessthan 1 year		1-5 years		5 - 10 years		More than 10 years
Cash equivalents and marketable securities	$	59,808	$	59,808	$	—	$	—	$	—