Warrants (Tables)

6 Months Ended

Jun. 30, 2015

Warrants Tables

Schedule of Fair Value Hierarchy

A summary of quantitative information with respect to the valuation methodology and significant unobservable inputs used for the Company’s warrant liabilities that are categorized within Level 3 of the fair value hierarchy as of June 30, 2015 and December 31, 2014 is as follows:

	June 30, 2015			December 31, 2014
	(unaudited)
Stock price	$	1.15		$	1.20
Volatility		80.70 – 90.00	%		72.90 – 88.10	%
Risk-free interest rate		1.63	%		1.65	%
Expected dividend yield		0	%		0	%
Expected warrant life		3.60 – 4.98 years			4.10 – 4.33 years

Schedule of Derivative Warrant Liabilities

Fair Value Measurements Using Significant Unobservable Inputs (Level 3):

Warrant liability:
Balance as of December 31, 2014	$	499
Issuance of warrants with derivative liabilities		2,958
Decrease in fair value of warrants		(651	)
Balance as of June 30, 2015	$	2,806