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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of valuation assumptions The assumptions used in the Black-Scholes option pricing model for stock options granted for the year ended December 31, 2019 are as follows:
Years Ended December 31,  
20192018
Risk-Free interest rate
1.69% - 2.50%
2.24% - 2.96%
Expected dividend yield
—%
—%
Expected stock price volatility
28.59% - 37.29%
27.80% - 30.36%
Expected life of options
2 - 6.25 Years
5 - 6.25 years
Discount for lack of marketability
0 - 8.48%
9.35%
Schedule of stock option activity
The following table summarizes the combined stock option activity under the Company’s Equity Compensation Plans:

        
SharesWeighted-Average Exercise PriceWeighted-Average Remaining Contractual Term (Years)Aggregate Intrinsic Value
Outstanding at December 31, 20172,712,390  $1.626.09$69,090
Granted 1,120,500  1.44  
Exercised(30,000) 0.15  
Expired—  —  
Canceled(250,000) 1.69  
Outstanding at December 31, 20183,552,890  $1.575.06$1,149,461
Granted (1)
1,089,000  2.26  
Exercised (2)
(781,500) 1.60  
Expired—  —  
Canceled—  —  
Outstanding at December 31, 20193,860,390  $1.765.69$13,287,932
Exercisable at December 31, 20192,747,073  $1.654.61$9,712,729
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Notes:
(1) Represents the following stock options granted:
•Annual share-based compensation awards on January 2, 2019, including: (a) 600,000 stock options with an exercise price of $1.87 per share granted to executives and key personnel, vesting upon grant, or one year anniversary, or vest annually in equal installments over four years, (b)300,000 stock options with an exercise price of $1.87 per share granted to the Board, vesting 25% upon grant and the remaining 75% will vest annually in equal installments over four years, and (c) 24,000 stock options with an exercise price of $1.87 per share granted to employees, vesting annually in equal installments over four years.
•One-time awards granted on (a) January 2, 2019 of 50,000 stock options with an exercise price of $1.87 per share granted to a contractor, vesting upon one year anniversary, (b) March 7, 2019 of 15,000 stock options with an exercise price of $3 per share granted to a contractor, vesting upon one year anniversary, (c) June 25, 2019 of 75,000 stock options with an exercise price of $5.83 per share granted to three members of the Board, vesting upon one year anniversary, and (d) June 28, 2019 of 25,000 stock options with an exercise price of $6.26 per share granted to the Chief Financial Officer, vesting immediately.
(2) Represents the following stock options exercised:
•A total of 781,500 stock options exercised with a weighted average market price of $1.60, including (a) net share exercise of 440,000 stock options resulting in the issuance of 304,171 shares of common stock, and surrender of 135,829 shares, and (b) 341,500 stock options exercised with cash payment.
Schedule of non-cash stock option compensation expense
Total non-cash stock option compensation expense was allocated among the following expense categories: 
Years Ended December 31,
20192018
General and administrative$1,069,152  $390,854  
Research and development101,927  76,349  
Total $1,171,079  $467,203