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Equity (Tables)
 9 Months Ended
Sep. 30, 2017
Equity [Abstract]  
Summary of Stock Option Plans

A summary of stock option activity for the nine months ended September 30, 2017 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, 2016     2,050,369     $ 3.62                  
Granted     90,000       0.25                  
Exercised     —                          
Forfeited or expired     (700,380 )   $ 3.51                  
Outstanding at September 30, 2017     1,439,989     $ 3.47       3.3 years     $ 8  
Exercisable at September 30, 2017     1,387,487     $ 3.57       3.2 years     $ 7  
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     2.2 %
Expected term of options     6.6 years  
Expected annual volatility     83 %
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, 2016     2,654,423     $ 1.46          
Granted     —       —          
Exercised     —       —          
Forfeited or expired     —       —          
Outstanding at September 30, 2017     2,654,423     $ 1.46       2.4 years