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Equity (Tables)
 9 Months Ended
Sep. 30, 2018
Equity [Abstract]  
Summary of Stock Option Activity

A summary of stock option activity for the nine months ended September 30, 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     175,000       0.32              
Exercised     —                      
Forfeited or expired     (20,000 )   $ 0.20              
Outstanding at September 30, 2018     1,556,489     $ 3.14     2.8 years   $ 24  
Exercisable at September 30, 2018     1,465,239     $ 3.31     2.6 years   $ 24  
Schedule of Stock Options Fair Value Assumptions Estimated Using Black-Scholes Pricing Model

The fair value of the options granted is $41 and was estimated on the grant date using the Black-Scholes option-pricing model with the following weighted average assumptions:

 

Risk-free interest rate     2.7 %
Expected term of options     6.6years  
Expected annual volatility     85 %
Expected dividend yield     — %
Summary of Warrant Activity

The Company previously issued warrants at exercise prices equal to or greater than market value of the Company’s Common Stock at the date of issuance. 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 September 30, 2018     2,654,423     $ 1.46     1.4 years