Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2017

Fair Value Disclosures [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

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, 2017
	Level 1		Level 2		Level 3		Total
Financial Assets:
Money market funds	$	43	$	—	$	—	$	43
Corporate fixed income debt securities		—		2,961		—		2,961
Total	$	43	$	2,961	$	—	$	3,004
Financial Liabilities:
Common stock warrant liability (1)	$	—	$	—	$	60	$	60
Total	$	—	$	—	$	60	$	60

	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 months ended March 31, 2017 was recorded as a decrease to other income (expense) and interest expense of $9, in the statements of operations and comprehensive loss.