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STOCK-BASED COMPENSATION (Tables)
9 Months Ended
Sep. 30, 2020
Share-based Payment Arrangement [Abstract]  
Summary of stock options and stock awards
Stock option activity is summarized as follows:
Number of optionsWeighted average exercise price
Outstanding at December 31, 20193,966,858 $4.67 
Granted1,376,900 7.94 
Exercised(81,131)3.03 
Canceled and forfeited(234,600)7.57 
Outstanding at September 30, 20205,028,027 $5.45 
Schedule of option fair value assumptions We calculated the grant date fair value of options granted in 2020 ("2020 Grants") utilizing a Black Scholes model with an expected life calculated via the simplified method.
2020 Grants
Strike price$4.98-$8.18 
Risk-free rate0.3%-1.7 %
Expected dividend yield
Expected volatility65.9%-70.1 %
Expected term (in years)6