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Equity (Tables)
 12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Summary of Option Activities
The following is a summary of option activities for the years ended December 31, 2016 and 2017:
 
 
Number of
Shares
 
Weighted Average Grant Date Fair Value
 
Weighted
Average
Exercise
Price
 
Weighted
Average
Remaining
Contractual
Term
(in years)
 
Aggregate
Intrinsic
Value
Outstanding, December 31, 2015
 
200,000

 
$
0.14

 
$
0.20

 
 
 
 

Granted - 2016
 
460,000

 
3.75

 
5.83

 
 
 
 

Cancelled - 2016
 
(150,000
)
 
0.14

 
0.20

 
 
 
 

Outstanding, December 31, 2016
 
510,000

 
$
3.40

 
$
5.28

 
9.29
 
$
275,500

Granted - 2017
 
835,000

 
$
1.59

 
$
2.42

 
 
 
 
Cancelled - 2017
 
—

 
 
 
 
 
 
 
 
Outstanding, December 31, 2017
 
1,345,000

 
$
1.93

 
$
3.50

 
9.07
 
$
83,000

 
 
 
 
 
 
 
 
 
 
 
Exercisable, December 31, 2017
 
50,000

 
$
0.13

 
$
0.20

 
2.42
 
$
83,000
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
 
—%
 
—%
Components of Share-Based Compensation
Stock-based compensation expense for the years ended December 31, 2017 and 2016, are as follows (in thousands):
 
 
Year Ended December 31,
 
 
2017
 
2016
General and administrative
 
$
684

 
$
321

Research and development
 
23

 
3

     Total
 
$
707

 
$
324