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Stockholders' Equity (Tables)
 3 Months Ended
Mar. 31, 2021
Stockholders' Equity Note [Abstract]  
Share-based Compensation, Stock Options, Activity Stock option activity for the Pre-2017 Non-Qualified Stock Options for the three months ended March 31, 2021 is presented in the table below:
 Number of SharesWeighted- average Exercise PriceWeighted- average Remaining Contractual Term (years)Aggregate Intrinsic Value (In Thousands)
Outstanding at December 31, 20202,465,500 $6.99 4.09$2,773,190 
Exercised(65,962)8.79   
Forfeited— — 
Outstanding at March 31, 20212,399,538 $6.94 3.93$8,821,839 
Stock option activity for options granted under the 2017 Plan during the three months ended March 31, 2021 is presented in the table below:
Number of Options OutstandingWeighted-average Exercise PriceWeighted-average Remaining Contractual Term (years)Aggregate Intrinsic Value (in thousands)
Balance at December 31, 2020611,760 $21.39 7.85$— 
Granted134,610 $11.65 
Exercised— — 
Forfeited(3,000)$8.2 
Balance at March 31, 2021743,370 $19.68 7.99$52,641 
Warrant activity for the three months ended March 31, 2021 is presented in the table below:
 Number of SharesWeighted- average Exercise PriceWeighted- average Remaining Contractual Term (years)Aggregate Intrinsic Value (in thousands)
Outstanding at December 31, 2020278,800 $9.72 3.51$1,164 
Exercised— $—   
Forfeited— $— 
Outstanding at March 31, 2021278,800 $9.72 3.26$— 
Exercisable at March 31, 2021278,800 $9.72 3.26$— 
Schedule of Nonvested Share Activity
A summary of the status of the Company’s non-vested Pre-2017 Non-Qualified Stock Options as of March 31, 2021 is presented below:
Number of OptionsWeighted Average Grant Date Fair Value
Vested at March 31, 20212,364,540 $6.90 
Non-vested at Non-vested at March 31, 202134,998 $10.00 
A summary of the status of the Company’s vested and non-vested options granted under the 2017 Plan as of March 31, 2021 is presented in the following table:
Number of SharesWeighted Average Grant Date Fair Value Per Share
Vested at March 31, 2021370,219 24.32 
Non-vested at March 31, 2021373,151 $12.02 
Schedule of Assumptions Used in the Valuation
The assumptions used in the valuation of options granted under the 2017 Plan during the three months ended March 31, 2021 were as follows:
For the Three Months Ended March 31, 2021
Market value of stock on measurement date
$8.2 to $12.15
Risk-free interest rate
0.5% to 1.11%
Dividend yield— 
Volatility factor
80.14% 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 three months ended March 31, 2021:
Number of SharesWeighted Average Fair Value Per Share
Restricted stock outstanding and unvested at December 31, 202049,600 $12.00 
Restricted stock granted61,043 $12.15 
Restricted stock vested(6,527)$13.60 
Restricted stock outstanding and unvested at March 31, 2021104,116 $11.99