Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2017

Fair Value Disclosures [Abstract]

Schedule of Company's Assets that are Measured at Fair Value on a Recurring Basis

The following table sets forth the Company’s assets that are measured at fair value on a recurring basis as of March 31, 2017 and December 31, 2016 (in thousands):

	Total		Quoted prices in active markets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)
March 31, 2017
Assets:
Cash and cash equivalents
Cash	$	2,399	$	2,399	$	—	$	—
Money market funds	14,722		14,722		$	—	$	—
Total cash and cash equivalents	17,121		17,121		—		—
Marketable securities
U.S. government agency securities and treasuries	39,582		—		39,582		—
Corporate debt securities	826		—		826		—
Total marketable securities	40,408		—		40,408		—
Restricted cash	2,433		2,433		—		—
Total assets	$	59,962	$	19,554	$	40,408	$	—

	Total		Quoted prices in active markets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)
December 31, 2016
Assets:
Cash and cash equivalents
Cash	$	2,785	$	2,785	$	—	$	—
Money market funds	$	9,647	$	9,647	$	—	$	—
US government agency securities and treasuries	$	4,000	—		4,000
Total cash and cash equivalents	16,432		12,432		4,000		—
Marketable securities
U.S. government agency securities and treasuries	42,512		—		42,512		—
Corporate debt securities	1,554		—		1,554		—
Total marketable securities	44,066		—		44,066		—
Restricted cash	2,432		2,432		—		—
Total assets	$	62,930	$	14,864	$	48,066	$	—