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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 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:

Nine Months Ended
September 30, 2021
Volatility
79.0% - 82.0%
Risk-free interest rate
0.19% - 0.98%
Expected life (in years)
2.75 - 6.08
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 
Granted738,628 24.08 
Exercised(395,181)14.13 
Forfeited(472,740)14.27 
Expired(271)48.00 
Outstanding as of September 30, 20213,486,750 16.77 
Options vested and exercisable as of September 30, 20211,115,549 $14.51 
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 
Granted114,000 29.55 
Forfeited(2,500)33.41 
Non-vested at September 30, 2021141,500 34.24 
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)(1,402,866)5.77 
Expired(13,258)4.80 
Outstanding as of September 30, 202149,803 13.51 
Warrants exercisable as of September 30, 202149,803 13.51 
____________
(1) Included in total number of warrants exercised are 218,225 shares that were net settled at the election of the warrant holders during the nine months ended September 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