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Warrant Liability (Tables)
 12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Schedule of Assumptions Used
The assumptions used in the BSM and MCM models for the Warrants are as follows:
 
 
Year Ended December 31,
 
 
2017
 
2016
Risk-free interest rate
 
1.68%-1.86%
 
—%
Volatility
 
80.00%-160.11%
 
—%
Expected life (years)
 
0.5-5.0
 
—
Dividend yield
 
-%
 
—%
The fair value of the option grants has been estimated, with the following weighted-average assumptions:
 
 
Year Ended December 31,
 
 
2017
 
2016
Risk-free interest rate
 
1.83
%
to
1.95%
 
1.3%
Volatility
 
80%
 
70.18
%
to
70.44%
Expected life (years)
 
5.0

to
6.25
 
6

to
6.25
Expected dividend yield
 
—%
 
—%
Schedule of Warrant Activity
A summary of our Warrant activity and related information follows:
Description
 
Number of
Shares Under
Warrant
 
Range of
Warrant Price
per Share
 
Weighted
Average
Exercise  Price
 
Weighted Average
Remaining
Contractual Life (Years)
Balance at January 1, 2017
 
—

 
—

 
—

 
—

Granted
 
8,235,923

 
$1.35-$1.50

 
$
1.43

 
—

Exercised
 
(2,728,434
)
 
—

 
$
1.46

 
—

Expired
 
(5,087,717
)
 
—

 
$
1.40

 
—

Balance at December 31, 2017
 
419,772

 
—

 
$
1.46

 
4.38

Vested and Exercisable at December 31, 2017
 
419,772

 
$1.35-$1.50

 
$
1.46

 
4.38