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Equity (Tables)
 3 Months Ended
Mar. 31, 2018
Equity [Abstract]  
Summary of Stock Option Activity

A summary of stock option activity for the three months ended March 31, 2018 is as follows:

 

   

 

 

Number

of Options

(in shares)

    

Weighted

Average

Exercise

Price Per Share

     Weighted Average Remaining Contractual Life     Aggregate Intrinsic Value  
Outstanding at December 31, 2017     1,401,489     $ 3.45                  
Granted     60,000       0.23                  
Exercised     —                          
Forfeited or expired     (7,500 )   $ 0.14                  
Outstanding at March 31, 2018     1,453,989     $ 3.33       3.0 years     $ 25  
Exercisable at March 31, 2018     1,400,655     $ 3.45       2.9 years     $ 20  
Schedule of Stock Options Fair Value Assumptions Estimated Using Black-Scholes Pricing Model

The fair value of the options granted was estimated on the grant date using the Black-Scholes option-pricing model with the following weighted average assumptions:

 

Risk-free interest rate     2.3 %
Expected term of options     6.7 years  
Expected annual volatility     85 %
Expected dividend yield     — %
Summary of Warrant Activity

A summary of warrant activity follows:

 

   

Number

of Warrants

(in shares)

     Weighted Average Exercise Price Per Share     Weighted Average Remaining Contractual Life  
Outstanding at December 31, 2017     2,654,423     $ 1.46          
Granted     —       —          
Exercised     —       —          
Forfeited or expired     —       —          
Outstanding at March 31, 2018     2,654,423     $ 1.46       1.9 years