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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%

X

- Definition

Collaborative Arrangement, Future Milestone Contributions

+ References

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- Definition

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- Definition

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- Definition

Face amount or stated value per share of common stock.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Cash received on stock transaction after deduction of issuance costs.

+ References

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- Definition

The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

+ References

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- Definition

Percentage of subsidiary's or equity investee's stock owned by parent company after stock transaction.

+ References

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- Definition

Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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