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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of assumptions used in the Black-Scholes option-pricing model
The assumptions used in the Black-Scholes option-pricing model were as follows:

Six Months Ended
June 30, 2021
Volatility
79.0% - 82.0%
Risk-free interest rate
0.19% - 0.89%
Expected life (in years)
2.75 - 5.85
Dividend yield0 %
Summary of stock option activity for employees and directors
A summary of stock option activity for employees, directors and consultants is as follows:
Number of Shares
Weighted Average
Exercise Price
Outstanding as of December 31, 20203,616,314 $14.66 
Granted418,628 33.68 
Exercised(379,098)14.25 
Forfeited(397,220)14.06 
Expired(271)48.00 
Outstanding as of June 30, 20213,258,353 17.22 
Options vested and exercisable as of June 30, 20211,015,490 $13.60 
Schedule of restricted stock units activity The following table summarizes our RSU award activity issued under the 2017 Plan:
Restricted Stock UnitsWeighted-
Average
Grant Date Fair Value
Non-vested at December 31, 202030,000 $51.98 
Granted55,000 33.39 
Non-vested at June 30, 202185,000 39.95 
Summary of warrants activity for non-employees A summary of warrants activity was as follows:
Number of Warrants
Weighted Average
Exercise Price
Outstanding as of December 31, 20201,465,927 $6.02 
Granted— — 
Exercised (1)(839,606)6.42 
Outstanding as of June 30, 2021626,321 5.49 
Warrants exercisable as of June 30, 2021626,321 5.49 
____________
(1) Included in total number of warrants exercised are 118,532 shares that were net settled at the election of the warrant holders during the six months ended June 30, 2021.
Schedule of performance based and market based issuances The following table summarizes the Company’s outstanding awards under this structure:
Grant DatePerformance MeasuresVesting TermPerformance Period# of SharesExercise Price
December 2017
Weighted Average Price of our common stock is $15.00 for at least twenty trading days within a period of thirty consecutive trading days ending on the trading day prior to January 1, 2023.
Fully vest on January 1, 2023January 1, 2023642,307 $7.50 
August 2018
Weighted Average Price of our common stock is $15.00 for at least twenty trading days within a period of thirty consecutive trading days ending on the trading day prior to January 1, 2023.
Fully vest on January 1, 2023January 1, 2023397,693 $7.50