Fair Value of Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2017

Fair Value Disclosures [Abstract]

Fair Value of Cash Equivalents and Investments by Level within Fair Value Hierarchy

The following tables set forth the fair value of the Company’s cash equivalents and investments by level within the fair value hierarchy (in thousands):

	As of  September 30, 2017
	Fair Value		Level I		Level II		Level III
Assets:
Money market funds	$	4,691	$	4,691	$	—	$	—
Corporate debt securities and commercial paper		17,261		—		17,261		—
Total assets measured at fair value	$	21,952	$	4,691	$	17,261	$	—

	As of December 31, 2016
	Fair Value		Level I		Level II		Level III
Assets:
Money market funds	$	2,669	$	2,669	$	—	$	—
Corporate debt securities and commercial paper		22,030		—		22,030		—
Total assets measured at fair value	$	24,699	$	2,669	$	22,030	$	—

Schedule of Cash, Cash Equivalents, and Investments

Cash, cash equivalents, and investments consisted of the following as of September 30, 2017 (in thousands):

	As of  September 30, 2017
	Amortized Cost		Unrealized Gains		Unrealized Losses			Estimated Fair Value
Assets:
Cash	$	5,196	$	—	$	—		$	5,196
Money market funds		4,691		—		—			4,691
Corporate debt securities and commercial paper		17,252		—		(9	)		17,261
Total cash, cash equivalents and investments	$	27,139	$	—	$	(9	)	$	27,148