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Stockholders' Equity (Tables)
 6 Months Ended
Jun. 30, 2022
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, 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 
Exercised— — 
Forfeited— — 
Outstanding at June 30, 20221,950,500 $7.17 2.9$9,393 
Stock option activity for options granted under the 2017 Plan during the six months ended June 30, 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 
Granted— $— 
Exercised(7,097)12.91
Forfeited(13,146)$13.69 
Balance at June 30, 2022738,815 $19.78 6.78$143 
Stock option activity for options granted under the Inducement Plan during the six months ended June 30, 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 June 30, 202256,500 $16.41 9.05$— 
Warrant activity for the six months ended June 30, 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$6,666 
Exercised— $— 
Forfeited— $— 
Outstanding at June 30, 2022278,800 $9.72 2.01$632 
Exercisable at June 30, 2022278,800 $9.72 2.01$632 
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, 2022 is presented below:
Number of OptionsWeighted Average Grant Date Fair Value
Vested at June 30, 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 June 30, 2022 is presented in the following table:
Number of SharesWeighted Average Grant Date Fair Value per Share
Vested at June 30, 2022572,307 $20.65 
Non-vested at June 30, 2022166,508 $9.60 
Restricted Stock Activity The following summarizes the restricted stock activity under the Company's 2017 Plan during the six months ended June 30, 2022:
Number of SharesWeighted Average Fair Value Per Share
Restricted stock outstanding and unvested at December 31, 2021104,416 $12.57 
Restricted stock granted147,475 $31.04 
Restricted stock vested(47,123)$12.58 
Restricted stock forfeited(6,925)$24.76 
Restricted stock outstanding and unvested at June 30, 2022197,843 $25.91 
Performance stock unit activity granted under the 2017 Plan during the six months ended June 30, 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(20,185)$32.85 
Performance stock forfeited— $— 
Performance stock outstanding and unvested at June 30, 202260,550 $32.85 
The following summarizes the restricted stock activity under the Inducement Plan during the six months ended June 30, 2022:
Number of SharesWeighted Average Fair Value Per Share
Restricted stock outstanding and unvested at December 31, 202149,800 $26.98 
Restricted stock granted30,450 $13.89 
Restricted stock vested— $— 
Restricted stock forfeited(5,450)$28.52 
Restricted stock outstanding and unvested at June 30, 202274,800 $21.27