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Stockholders' Equity (Tables)
 3 Months Ended
Mar. 31, 2022
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, 2022 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, 20211,950,500 $7.17 3.4$51,602,190 
Exercised— —   
Forfeited— — 
Outstanding at March 31, 20221,950,500 $7.17 3.15$27,786,585 
Stock option activity for options granted under the 2017 Plan during the three months ended March 31, 2022 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, 2021759,058 $19.61 7.31$10,997,428 
Granted— $— 
Exercised(7,046)$19.49 
Forfeited(14,151)$12.60 
Balance at March 31, 2022737,861 $19.79 7.02$3,897,756 
Stock option activity for options granted under the Inducement Plan during the three months ended March 31, 2022 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, 202156,500 $16.41 9.55$973 
Granted— $— 
Exercised— — 
Forfeited— $— 
Balance at March 31, 202256,500 $16.41 9.3$283 
Warrant activity for the three months ended March 31, 2022 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, 2021278,800 $9.72 2.51$6,665,644 
Exercised— $—   
Forfeited— $— 
Outstanding at March 31, 2022278,800 $9.72 2.26$3,261,496 
Exercisable at March 31, 2022278,800 $9.72 2.26$3,261,496 
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, 2022 is presented below:
Number of OptionsWeighted Average Grant Date Fair Value
Vested at March 31, 20221,950,500 $7.17 
A summary of the status of the Company’s vested and non-vested options granted under the 2017 Plan as of March 31, 2022 is presented in the following table:
Number of SharesWeighted Average Grant Date Fair Value Per Share
Vested at March 31, 2022535,326 $21.42 
Non-vested at March 31, 2022202,535 $9.59 
Schedule of Restricted Stock Activity The following summarizes the restricted stock unit activity under the Company's 2017 Plan during the three months ended March 31, 2022:
Number of SharesWeighted Average Fair Value Per Share
Restricted stock outstanding and unvested at December 31, 2021104,416 $12.57 
Restricted stock granted135,475 $32.85 
Restricted stock vested(31,746)$12.45 
Restricted stock forfeited(6,925)$24.76 
Restricted stock outstanding and unvested at March 31, 2022201,220 $12.15 
Performance stock unit activity granted under the 2017 Plan during the three months ended March 31, 2022 is presented in the table below:

Number of SharesWeighted Average Fair Value Per Share
Performance stock outstanding and unvested at December 31, 2021— $— 
Performance stock granted80,735 $32.85 
Performance stock vested— $— 
Performance stock forfeited— $— 
Performance stock outstanding and unvested at March 31, 202280,735 $32.85 
The following summarizes the restricted stock activity under the Inducement Plan during the three months ended March 31, 2022:
Number of SharesWeighted Average Fair Value Per Share
Restricted stock outstanding and unvested at December 31, 202149,800 $26.98 
Restricted stock granted4,550 $26.16 
Restricted stock vested— $— 
Restricted stock forfeited— $— 
Restricted stock outstanding and unvested at March 31, 202254,350 $26.91