Fair Value of Financial Measurements (Tables)

3 Months Ended

Mar. 31, 2017

Fair Value of Assets and Liabilities Measured on Recurring Basis

The following table sets forth the Company’s financial instruments that were measured at fair value on a recurring basis by level within the fair value hierarchy:

	Fair Value Measurements at
	March 31, 2017
	Total		Level 1		Level 2		Level 3
Assets:
Money market mutual funds (included in cash and cash equivalents)	$	13,090	$	13,090	$	—	$	—

Certificates of deposit	$	22,313	$	—	$	22,313	$	—
Agency bonds		5,906		—		5,906		—
United States Treasury securities		61,213		61,213		—		—
Short-term investments	$	89,432	$	61,213	$	28,219	$	—

	Fair Value Measurements at
	December 31, 2016
	Total		Level 1		Level 2		Level 3
Assets:
Money market mutual funds (included in cash and cash equivalents)	$	20,698	$	20,698	$	—	$	—

Certificates of deposit	$	22,046	$	—	$	22,046	$	—
Agency bonds		5,913		—		5,913		—
United States Treasury securities		68,716		68,716		—		—
Short-term investments	$	96,675	$	68,716	$	27,959	$	—