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- Definition

Option Indexed To Issuers Equity, cap price

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- Definition

Treasury Shares Acquired, Estimated, Prepaid Forward

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No definition available.

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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.

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No definition available.

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- Definition

The number of new shares issued in the conversion of stock in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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- Definition

The price per share of the conversion feature embedded in the debt instrument.

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- Definition

The number of equity instruments that the holder of the debt instrument would receive if the debt was converted to equity.

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- Definition

Face (par) amount of debt instrument at time of issuance.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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Net loss per share Additional Information (Details)			3 Months Ended	9 Months Ended
Net loss per share Additional Information (Details)	Nov. 24, 2020 USD ($) shares $ / shares	Apr. 12, 2017 USD ($) shares $ / shares	Sep. 30, 2020 shares	Sep. 30, 2021 shares	Sep. 30, 2020 shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Treasury Shares Acquired, Estimated, Prepaid Forward			9,200,000		9,200,000
Option Indexed To Issuers Equity, cap price \| $	$ 12.0925
Common Class A [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common Stock, Voting Rights, Number				1
Conversion of Stock, Shares Issued				1
Common Class B [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common Stock, Voting Rights, Number				10
Convertible Senior Notes due 2022 [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Debt Instrument \| $		$ 175,000,000
Interest rate		3.50%
Maximum number of shares issuable upon conversion of the notes		20,600,000
Debt Instrument, Convertible, Conversion Price \| $ / shares		$ 10.64
Convertible Senior Notes due 2025 [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Debt Instrument \| $	$ 143,800,000
Interest rate	1.25%
Maximum number of shares issuable upon conversion of the notes	20,800,000
Debt Instrument, Convertible, Conversion Price \| $ / shares	$ 9.3285