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Stockholders' Equity (Tables)
 6 Months Ended
Jun. 30, 2021
Stockholders' Equity Note [Abstract]  
Share-based Compensation, Stock Options, Activity Stock option activity for the Pre-2017 Non-Qualified Stock Options for the six months ended June 30, 2021 is presented in the table below:
 Number of SharesWeighted- average Exercise PriceWeighted- average Remaining Contractual Term (years)Aggregate Intrinsic Value
Outstanding at December 31, 20202,465,500 $6.99 4.09$2,773,190 
Exercised(71,592)8.61   
Forfeited(23,332)10.00 
Outstanding at June 30, 20212,370,576 $6.91 3.72$15,303,270 
Stock option activity for options granted under the 2017 Plan during the six months ended June 30, 2021 is presented in the table below:
Number of Options OutstandingWeighted-average Exercise PriceWeighted-average Remaining Contractual Term (years)Aggregate Intrinsic Value
Balance at December 31, 2020611,760 $21.39 7.85$— 
Granted147,110 $11.79 
Exercised— — 
Forfeited(3,000)$8.20 
Balance at June 30, 2021755,870 $19.58 7.78$484,626 
Warrant activity for the six months ended June 30, 2021 is presented in the table below:
 Number of SharesWeighted- average Exercise PriceWeighted- average Remaining Contractual Term (years)Aggregate Intrinsic Value
Outstanding at December 31, 2020278,800 $9.72 3.51$1,164,000 
Exercised— $—   
Forfeited— $— 
Outstanding at June 30, 2021278,800 $9.72 3.01$1,017,156 
Exercisable at June 30, 2021278,800 $9.72 3.01$1,017,156 
Schedule of Nonvested Share Activity
A summary of the status of the Company’s non-vested Pre-2017 Non-Qualified Stock Options as of June 30, 2021 is presented below:
Number of OptionsWeighted Average Grant Date Fair Value
Vested at June 30, 20212,358,910 $6.90 
Non-vested at Non-vested at June 30, 202111,666 $10.00 
A summary of the status of the Company’s vested and non-vested options granted under the 2017 Plan as of June 30, 2021 is presented in the following table:
Number of SharesWeighted Average Grant Date Fair Value Per Share
Vested at June 30, 2021439,712 22.69 
Non-vested at June 30, 2021316,158 $11.44 
Schedule of Assumptions Used in the Valuation The assumptions used in the valuation of options granted under the 2017 Plan during the six months ended June 30, 2021 were as follows:
For the Six Months Ended June 30, 2021
Market value of stock on measurement date
$8.2 to $13.30
Risk-free interest rate
0.5% to 1.11%
Dividend yield— 
Volatility factor
75.92% to 88.79%
Term
5.50 to 6.25 years
Restricted Stock Activity The following summarizes the restricted stock activity under the Company's 2017 Plan during the six months ended June 30, 2021:
Number of SharesWeighted Average Fair Value Per Share
Restricted stock outstanding and unvested at December 31, 202049,600 $12.00 
Restricted stock granted73,043 $12.34 
Restricted stock vested(19,902)$10.79 
Restricted stock outstanding and unvested at June 30, 2021102,741 $10.92