Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2018

Fair Value Disclosures [Abstract]

Schedule of assets and liabilities measured at fair value on a recurring basis

Assets and liabilities measured at fair value on the Company’s balance sheet on a recurring basis include the following at September 30, 2018 and December 31, 2017 (in thousands):

Warrant Liability	Level 1	Level 2	Level 3
September 30, 2018	—	—	$	78
December 31, 2017	—	—	$	669

Schedule of reconciliation of warrant liability

The following is a reconciliation of the warrant liability, included in accrued expenses and other current liabilities in the accompanying unaudited condensed consolidated balance sheets, measured at fair value using Level 3 inputs (in thousands):

	Nine Months Ended September 30,
	2018			2017
Balance at beginning of period	$	669		$	1,226
Exercise of common stock warrants	—			(34		)
Remeasurement of common stock warrants	(591		)	(404		)
Balance at end of period	$	78		$	788