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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2020
Share-based Payment Arrangement [Abstract]  
Summary of Stock Options

A summary of stock option awards as of December 31, 2020 and changes during the two-year period ended December 31, 2020 is presented below:

 

Stock Options   Number Outstanding     Weighted Average Exercise Price     Weighted Average Remaining Contractual Term (years)     Aggregate Intrinsic Value  
Outstanding at January 1, 2019     3,148,743     $ 2.67                  
Options granted     1,250,754     $ 2.00                  
Options canceled or expired     (67,355 )   $ 2.50                  
Outstanding at December 31, 2019     4,332,142     $ 2.63                  
Options granted     670,250     $ 3.41                  
Options exercised     (140,864 )   $ 2.12                  
Options canceled or expired     (236,803 )   $ 2.14                  
Outstanding at December 31, 2020     4,624,725     $ 2.77       7.8     $ 5,882  
                                 
Exercisable at December 31, 2020     3,351,086     $ 2.80       7.4     $ 750  
Summary of Non-Vested Restricted Stock Awards

A summary of the status of the Company’s non-vested restricted stock awards as of December 31, 2020 and changes during the two-year period ended December 31, 2020, is presented below:

 

Restricted Stock  

Number

Outstanding

    

Weighted

Average

Grant Date

Fair Value

  
Non-vested stock awards outstanding at January 1, 2019     22,500     $ 2.72  
Granted     29,250     $ 1.99  
Vested and issued     (5,000 )   $ 2.14  
Forfeited     (38,000 )   $ 2.48  
Non-vested stock awards outstanding at December 31, 2019     8,750     $ 1.59  
Granted     431,605     $ 1.16  
Vested and issued     (434,105 )   $ 1.16  
Forfeited     (3,500 )   $ 1.59  
Non-vested stock awards outstanding at December 31, 2020     2,750     $ 0.98  
Summary of Stock Options Outstanding

A summary of stock options outstanding at December 31, 2020 by price range is as follows:

 

    Options Outstanding     Options Exercisable  
             
Range of Exercise Prices   Number    

Weighted Average Remaining Contractual Term

(in years)

     Weighted Average Exercise Price     Number    

Weighted Average Remaining Contractual Term

(in years)

     Weighted Average Exercise Price  
                                     
Up to $2.00     429,667       8.8     $ 1.64       147,276       8.8     $ 1.66  
$2.00 to $5.00     4,130,723       7.7     $ 2.64       3,139,475       7.3     $ 2.53  
Above $5.00 to $81.90     64,335       5.2     $ 18.81       64,335       5.2     $ 18.81  
      4,624,725                       3,351,086                  
Schedule of Assumptions Used to Determine Fair Value of Options Granted

The Company used the following assumptions for determining the fair value of options granted under the Black-Scholes option pricing model:

 

    Year Ended December 31,  
    2020     2019  
Risk-free interest rate     0.65% to 1.33 %     2.82 to 3.02 %
Expected volatility     100.4% to 109.1 %     101.3 to 106.2 %
Expected life (in years)     7.5 to 10.0       7.5 to 9.3  
Expected dividend yield     0.0 %     0.0 %