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STOCKHOLDERS' EQUITY - Stock option activity (Details) - Employee Stock Option [Member]
$ / shares in Units, $ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Equity Incentive Plans Stock Option Activity [Line Items]    
Number of shares, Outstanding Beginning Balance | shares 2,605,730  
Number of shares, Granted. | shares 75,000  
Number of shares, Exercised | shares (32,847)  
Number of shares, Forfeited | shares (118,750)  
Number of shares, Expired | shares 0  
Number of shares, Outstanding Ending Balance | shares 2,529,133 2,605,730
Weighted - average exercise price, Outstanding Beginning Balance | $ / shares $ 6.73  
Weighted - average exercise price, Granted | $ / shares 8.21  
Weighted - average exercise price, Exercised | $ / shares 4.10  
Weighted - average exercise price, Forfeited | $ / shares 10.16  
Weighted - average exercise price, Expired | $ / shares 0  
Weighted - average exercise price, Outstanding Ending Balance | $ / shares $ 6.99 $ 6.73
Weighted - average Contractual Term 8 years 4 months 6 days 8 years 11 months 1 day
Aggregate Intrinsic Value, Outstanding | $ $ 50,757,217 $ 11,706,110