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Stock-Based Compensation, Stock Options (Details) - shares		9 Months Ended
	May 19, 2021	Sep. 30, 2021	May 18, 2021
2009 Employee Option Plan
Stock-Based Compensation
Additional shares available for the granting of stock options		0
Options ratable vesting period		5 years
Options exercisable period		10 years
2017 Option Plan
Stock-Based Compensation
Additional shares available for the granting of stock options	40,000,000
Number of shares originally authorized for issuance of stock options under stock option plan			60,000,000
Remaining shares available for the granting of stock options under plan		43,038,110
Options ratable vesting period		5 years
Options exercisable period		10 years