Fair Value Measurements - (Tables)

12 Months Ended

Dec. 31, 2017

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis

Assets and liabilities measured at fair value on the Company’s balance sheet on a recurring basis include the following at December 31, 2017 and December 31, 2016 (in thousands):



Warrant Liability	Level 1	Level 2	Level 3
December 31, 2017	—	—	$	669
December 31, 2016	—	—	$	1,226

Schedule of Reconciliation of Warrants Liability

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



	Years Ended December 31,
	2017			2016
Balance at beginning of period	$	1,226		$	3,072
Issuance of common stock warrants	—			858
Exercise of common stock warrants	(34		)	(1,150		)
Remeasurement of common stock warrants	(523		)	(1,554		)
Balance at end of period	$	669		$	1,226

Schedule of Reconciliation of Embedded Derivatives

The following is a reconciliation of the embedded bifurcated derivative liability measured at fair value using significant unobservable inputs, Level 3 (in thousands):



	Years Ended
	December 31,
	2017		2016
Balance at beginning of period	$	—	$	—
Transfers in and/or out of Level 3	—		—
Initial valuation of bifurcated derivative liability	—		3,936
Extinguishment of bifurcated derivative liability	—		(3,936		)
Balance at end of period	$	—	$	—