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Equity - Issuance of Class B Common Stock (Details) $ / shares in Units, $ in Millions |  | 84 Months Ended |  |
--- | --- | --- | --- | ---
Jul. 31, 2020 USD ($) installment $ / shares shares | Jul. 31, 2027 | Jun. 30, 2020 $ / shares | Dec. 31, 2019 $ / shares
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Common stock par value (in dollars per share) |  |  | $ 0.01 | $ 0.01
Google | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Future milestone contributions | $ | $ 150 |  |  |
Term of agreement | 7 years |  |  |
Number of milestone contribution installments | installment | 3 |  |  |
Common Class B | Subsequent Event |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Number of shares issued in transaction (in shares) | shares | 54,744,525 |  |  |
Common stock par value (in dollars per share) | $ 0.01 |  |  |
Consideration received on transaction | $ | $ 450 |  |  |
Price per share (in dollars per share) | $ 8.22 |  |  |
Common Class B | Subsequent Event | Google |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Percentage of ownership |  | 6.60% |  |
Common Class B | Subsequent Event | Over-Allotment Option | Google |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Percentage of ownership |  | 9.90% |  |

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