Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2016

Fair Value Disclosures [Abstract]

Schedule of Fair Value of Company's Financial Assets and Liabilities

The following table presents the fair value of the Company’s financial assets and liabilities determined using the inputs defined above (amounts in thousands).

	September 30, 2016
	Level 1		Level 2		Level 3		Total
Assets
Money market funds	$	1,257	$	—	$	—	$	1,257
	$	1,257	$	—	$	—	$	1,257
Liabilities
Preferred stock warrant liabilities	$	—	$	—	$	3,945	$	3,945
	$	—	$	—	$	3,945	$	3,945

	December 31, 2015
	Level 1		Level 2		Level 3		Total
Assets
Money market funds	$	1,254	$	—	$	—	$	1,254
	$	1,254	$	—	$	—	$	1,254
Liabilities
Preferred stock warrant liabilities	$	—	$	—	$	2,949	$	2,949
	$	—	$	—	$	2,949	$	2,949

Summary of Changes in Fair Value of Preferred Stock Warrants Classified as Level 3

The following table sets forth a summary of the changes in the fair value of the preferred stock warrants which is classified as Level 3 in the fair value hierarchy.

	Nine Months Ended September 30, 2016		Year Ended December 31, 2015
Beginning balance	$	2,949	$	2,794
Fair value of preferred stock warrants issued in connection    with long-term debt		—		44
Total change in fair value recorded as other expense, net	996			111
Ending balance	$	3,945	$	2,949