Stock-Based Compensation - Additional Information (Details) shares in Millions, $ in Millions |
9 Months Ended |
|---|---|
|
Sep. 30, 2020
USD ($)
shares
| |
| Stock-based compensation | |
| Total unrecognized compensation cost related to unvested Awards | $ | $ 45 |
| Weighted average period of recognition related to unvested equity awards (in years) | 2 years 4 months 24 days |
| Common Class A | |
| Stock-based compensation | |
| Shares reserved for future issuance upon exercise of stock options | 38.6 |
| Common Class B | |
| Stock-based compensation | |
| Shares reserved for future issuance upon exercise of stock options | 3.0 |