Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2019

Fair Value Disclosures [Abstract]

Schedule of fair value of financial instruments

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): 

	March 31, 2019
	Level 1		Level 2		Level 3		Total
Financial Liabilities:
Common stock warrant liability (1)	$	—	$	—	$	5	$	5
Total	$	—	$	—	$	5	$	5
	December 31, 2018
		Level 1		Level 2		Level 3		Total
Financial Assets:
Money market funds	$	—	$	—	$	—	$	—
Corporate fixed income debt securities		—		—		—		—
Total	$	3	$	—	$	—	$	—
Financial Liabilities:
Common stock warrant liability (1)	$	—	$	—	$	—	$	—
Total	$	—	$	—	$	—	$	—

(1) The change in the fair value of the common stock warrant and convertible notes payable for the three months ended March 31, 2019 was recorded as a decrease to other income (expense) and interest expense of $5, in the statements of operations and comprehensive loss.