Additional Financial Information - Additional Information (Details) - shares |
12 Months Ended | |
|---|---|---|
Aug. 03, 2020 |
Dec. 31, 2020 |
|
| DT | ||
| Related Party Transaction [Line Items] | ||
| Percentage of stock held | 43.40% | 43.40% |
| Voting control, percentage | 52.40% | 52.30% |
| SoftBank | ||
| Related Party Transaction [Line Items] | ||
| Percentage of stock held | 8.60% | 8.60% |
| SoftBank | DT | Direct and Indirect Call Option | ||
| Related Party Transaction [Line Items] | ||
| Option to purchase shares (in shares) (up to) | 101,500,000 | |
| Other Stockholders | ||
| Related Party Transaction [Line Items] | ||
| Percentage of stock held | 48.00% | 48.00% |
| Warrants and Rights Subject to Mandatory Redemption | Rights Offering | ||
| Related Party Transaction [Line Items] | ||
| Option to purchase common stock (in shares) (up to) | 19,750,000 |