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

CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY - Option Activity of the Plan (Details)

v3.20.4
CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY - Option Activity of the Plan (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
 1 Months Ended 9 Months Ended 12 Months Ended
Jul. 31, 2020
USD ($)
employee
Sep. 30, 2020
USD ($)
$ / shares
shares
Sep. 30, 2019
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Number of shares          
Outstanding at beginning of period (in shares) | shares   14,792 12,007 12,007  
Granted (in shares) | shares   6,935   4,790  
Exercised (in shares) | shares   (409)   (997)  
Forfeited/expired (in shares) | shares   (5,287)   (1,008)  
Outstanding at end of period (in shares) | shares   16,031   14,792 12,007
Options vested at end of period (in shares) | shares   8,167   7,195  
Options vested or expected to vest at end of period (in shares) | shares   15,384   14,555  
Weighted-Average Exercise Price per share          
Outstanding at beginning of period (in dollars per share)   $ 2.45 $ 1.65 $ 1.65  
Granted (in dollars per share)   1.85   3.98  
Exercised (in dollars per share)   0.65   0.71  
Forfeited/expired (in dollars per share)   3.57   1.88  
Outstanding at end of period (in dollars per share)   1.87   2.45 $ 1.65
Options vested at end of period (in dollars per share)   1.83   1.52  
Options vested or expected to vest at September 30, 2020   $ 1.87   $ 2.44  
Weighted-average remaining contractual term (in years)   7 years 10 months 6 days   7 years 10 months 2 days 8 years 2 months 16 days
Options vested at December 31, 2020   6 years 4 months 17 days   6 years 11 months 1 day  
Options vested or expected to vest at September 30, 2020   7 years 9 months 11 days   7 years 9 months 26 days  
Aggregate intrinsic value of options outstanding | $   $ 126,300   $ 24,040  
Weighted average grant date fair value for options granted   $ 4.30 $ 2.11 $ 2.17 $ 1.64
Aggregate intrinsic value of options exercised | $   $ 1,700 $ 3,000 $ 3,400 $ 2,100
Vesting period of repriced options 4 years        
Cliff vesting period 1 year        
Number of employees affected by repricing | employee 116        
Incremental compensation cost | $ $ 3,600