Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2017

Fair Value Disclosures [Abstract]

Schedule of fair value on a recurring basis by level of fair value hierarchy

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 (in thousands):

	June 30, 2017
	Level 1		Level 2		Level 3		Total
Financial Assets:
Money market funds	$	60	$	—	$	—	$	60
Corporate fixed income debt securities		—		2,950		—		2,950
Total	$	60	$	2,950	$	—	$	3,010
Financial Liabilities:
Common stock warrant liability (1)	$	—	$	—	$	33	$	33
Total	$	—	$	—	$	33	$	33

	December 31, 2016
	Level 1		Level 2		Level 3		Total
Financial Assets:
None	$	—	$	—	$	—	$	—
Financial Liabilities:
Common stock warrant liability (1)	$	—	$	—	$	69	$	69
Total	$	—	$	—	$	69	$	69

(1) The change in the fair value of the common stock warrant and convertible notes payable for the three and six months ended June 30, 2017 was recorded as a decrease to other income (expense) and interest expense of $30 and $39, respectively, in the statements of operations and comprehensive loss.