General form of registration statement for all companies including face-amount certificate companies

CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY - Stock Incentive Plan (Details)

v3.20.4
CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY - Stock Incentive Plan (Details) - USD ($)
$ in Thousands
1 Months Ended 9 Months Ended 12 Months Ended
Jul. 31, 2019
Mar. 31, 2018
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Amount of convertible notes issued   $ 248,874          
Shares issues upon conversion   279,166          
Accrued interest rate   2.57%          
Accrued interest   $ 6,571          
Repurchase of common stock   62,610          
Granted (in shares)     6,935,000   4,790,000    
Unrecognized stock-based compensation expense, stock options     $ 16,500   $ 13,000 $ 6,900  
Weighted-average period     3 years 9 months 18 days   1 year    
Shares available for grant     1,960,118 4,463,000 3,894,467 565,000  
Consultant              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Options and warrants to be issued           0  
Granted (in shares)     10,000 97,919 97,919    
Fair value of shares     $ 300 $ 100 $ 600    
Employee              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Granted (in shares)     6,925,144 4,107,709 4,692,509 2,387,517  
Fair value of shares     $ 29,800 $ 8,900 $ 10,100 $ 3,900  
2015 stock incentive plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Awards made under the plan             21,522,567
Vesting percentage             25.00%
Monthly vesting percentage rate             2.0833%
Vesting period             3 years
Expiration period             10 years
Tax benefits from share based compensation             $ 0
2015 stock incentive plan | Maximum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Awards made under the plan             21,522,567
Make Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting percentage 25.00%         25.00%  
Monthly vesting percentage rate 2.0833%         2.0833%  
Vesting period 3 years         3 years  
Expiration period 10 years         10 years  
Tax benefits from share based compensation $ 0         $ 0  
Options and warrants to be issued 193,223         190,223  
Granted (in shares)           0