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Convertible Notes - Additional Information (Details) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 01, 2021 USD ($) | Apr. 30, 2021 USD ($) d $ / shares shares | Apr. 30, 2020 USD ($) $ / shares shares | Aug. 31, 2019 USD ($) $ / shares shares | Sep. 30, 2021 USD ($) $ / shares | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) $ / shares shares | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from issuance of convertible notes, net of issuance costs |  |  |  |  |  |  | $ 1,137,227,000 | $ 988,582,000 |
Accumulated deficit |  |  |  |  | $ (8,307,016,000) |  | (8,307,016,000) |  | $ (7,891,542,000)
Convertible senior notes, net |  |  |  |  | 2,252,079,000 |  | 2,252,079,000 |  | $ 1,675,169,000
Amortization of debt discount and issuance costs |  |  |  |  | 1,109,000 | $ 24,503,000 | 3,301,000 | 56,478,000 |
Induced conversion expense related to convertible notes |  |  |  |  | 4,536,000 |  | 41,538,000 |  |
Exchange Agreements |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Induced conversion expense related to convertible notes |  |  |  |  | $ 4,500,000 |  | 41,500,000 |  |
Shares issued under original terms of general conversion with net carrying amount |  |  |  |  |  |  | $ 1,132,600,000 |  |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Accumulated deficit | $ (95,000,000.0) |  |  |  |  |  |  |  |
Additional paid-in capital | (664,000,000.0) |  |  |  |  |  |  |  |
Convertible senior notes, net | $ 569,000,000.0 |  |  |  |  |  |  |  |
Accounting Standards Update 2020-06 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Change in accounting principle, accounting standards update, adoption date |  |  |  |  | Jan. 01, 2021 |  | Jan. 01, 2021 |  |
Change in accounting principle, accounting standards update, early adoption [true false] |  |  |  |  | true |  | true |  |
Change in accounting principle, accounting standards update, transition option elected |  |  |  |  |  |  | us-gaap:AccountingStandardsUpdate202006RetrospectiveMember |  |
Class A Non-voting Common Stock | Exchange Agreements |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Shares issued upon conversion | shares |  |  |  |  |  |  | 52,400,000 |  |
Additional shares issued upon conversion | shares |  |  |  |  |  |  | 700,000 |  |
Fair value of induced conversion exchange shares | shares |  |  |  |  |  |  | 700,000 |  |
2027 Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, principal amount |  | $ 1,150,000,000 |  |  | $ 1,150,000,000 |  | $ 1,150,000,000 |  |
Indenture date |  | Apr. 30, 2021 |  |  |  |  |  |  |
Proceeds from issuance of convertible notes, net of issuance costs |  | $ 1,050,000,000.00 |  |  |  |  |  |  |
Debt instrument, maturity date |  | May 01, 2027 |  |  |  |  |  |  |
Debt instrument, redemption price percentage |  | 100.00% |  |  |  |  |  |  |
Debt instrument convertible, amortization period |  |  |  |  |  |  | 5 years 7 months 6 days |  |
Cap price, net cost |  |  |  |  | $ 86,800,000 |  | $ 86,800,000 |  |
2027 Notes | Class A Non-voting Common Stock |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Number of shares issued upon conversion | shares |  | 11.2042 |  |  |  |  |  |  |
Debt instrument, convertible principal amount used in conversion rate |  | $ 1,000 |  |  |  |  |  |  |
Conversion price per share | $ / shares |  | $ 89.25 |  |  |  |  |  |  |
Debt instrument convertible, percentage of conversion price |  | 130.00% |  |  |  |  |  |  |
Debt instrument convertible, number of trading days | d |  | 20 |  |  |  |  |  |  |
Debt instrument, redemption price percentage |  | 100.00% |  |  |  |  |  |  |
Cap price, per share | $ / shares |  |  |  |  | $ 121.02 |  | $ 121.02 |  |
2027 Notes | Class A Non-voting Common Stock | Scenario One |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument convertible, percentage of conversion price |  | 130.00% |  |  |  |  |  |  |
Debt instrument convertible, number of trading days | d |  | 20 |  |  |  |  |  |  |
Debt instrument convertible, number of consecutive trading days | d |  | 30 |  |  |  |  |  |  |
2027 Notes | Class A Non-voting Common Stock | Scenario Two |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, convertible principal amount used in conversion rate |  | $ 1,000 |  |  |  |  |  |  |
Debt instrument convertible, number of consecutive trading days | d |  | 10 |  |  |  |  |  |  |
Debt instrument, convertible, threshold business days |  | 5 days |  |  |  |  |  |  |
2027 Notes | Class A Non-voting Common Stock | Scenario Two | Maximum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument convertible, percentage of conversion price |  | 98.00% |  |  |  |  |  |  |
2025 Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, principal amount |  |  | $ 1,000,000,000.0 |  | $ 284,105,000 |  | $ 284,105,000 |  |
Debt instrument, maturity date |  |  | May 01, 2025 |  |  |  |  |  |
Proceeds from issuance of convertible notes, net of issuance costs |  |  | $ 888,600,000 |  |  |  |  |  |
Interest payment beginning date |  |  | Nov. 01, 2020 |  |  |  |  |  |
Debt instrument, interest rate |  |  | 0.25% |  |  |  |  |  |
Debt instrument, interest rate terms |  |  |  |  |  |  | Interest is payable in cash semi-annually in arrears beginning on November 1, 2020 at a rate of 0.25% per year. |  |
Debt instrument convertible, amortization period |  |  |  |  |  |  | 3 years 7 months 6 days |  |
If-converted value exceeding principal amount |  |  |  |  |  |  | $ 683,900,000 |  |
Cap price, net cost |  |  |  |  | $ 100,000,000.0 |  | 100,000,000.0 |  |
2025 Notes | Exchange Agreements |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt conversion, principal amount |  |  |  |  |  |  | $ 715,900,000 |  |
2025 Notes | Class A Non-voting Common Stock |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Number of shares issued upon conversion | shares |  |  | 46.1233 |  |  |  |  |  |
Debt instrument, convertible principal amount used in conversion rate |  |  | $ 1,000 |  |  |  |  |  |
Conversion price per share | $ / shares |  |  | $ 21.68 |  |  |  |  |  |
Cap price, per share | $ / shares |  |  |  |  | $ 32.12 |  | $ 32.12 |  |
2026 Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, principal amount |  |  |  | $ 1,265,000,000 | $ 838,495,000 |  | $ 838,495,000 |  |
Debt instrument, maturity date |  |  |  | Aug. 01, 2026 |  |  |  |  |
Proceeds from issuance of convertible notes, net of issuance costs |  |  |  | $ 1,150,000,000 |  |  |  |  |
Interest payment beginning date |  |  |  | Feb. 01, 2020 |  |  |  |  |
Debt instrument, interest rate |  |  |  | 0.75% |  |  |  |  |
Debt instrument, interest rate terms |  |  |  |  |  |  | Interest is payable in cash semi-annually in arrears beginning on February 1, 2020 at a rate of 0.75% per year. |  |
Debt instrument convertible, amortization period |  |  |  |  |  |  | 4 years 9 months 18 days |  |
If-converted value exceeding principal amount |  |  |  |  |  |  | $ 1,900,000,000 |  |
Cap price, net cost |  |  |  |  | $ 102,100,000 |  | 102,100,000 |  |
2026 Notes | Exchange Agreements |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt conversion, principal amount |  |  |  |  |  |  | $ 426,500,000 |  |
2026 Notes | Class A Non-voting Common Stock |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Number of shares issued upon conversion | shares |  |  |  | 43.8481 |  |  |  |  |
Debt instrument, convertible principal amount used in conversion rate |  |  |  | $ 1,000 |  |  |  |  |
Conversion price per share | $ / shares |  |  |  | $ 22.81 |  |  |  |  |
Cap price, per share | $ / shares |  |  |  |  | $ 32.58 |  | $ 32.58 |  |
2025, 2026 and 2027 Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Amortization of debt issuance costs |  |  |  |  | $ 1,100,000 |  | $ 3,300,000 |  |
Amortization of debt discount and issuance costs |  |  |  |  |  | 24,500,000 |  | 56,500,000 |
Contractual interest expense |  |  |  |  | $ 1,900,000 | $ 3,000,000.0 | $ 7,200,000 | $ 8,200,000 |
Initial Placement | 2027 Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, principal amount |  | $ 1,000,000,000.0 |  |  |  |  |  |  |
Over-Allotment Option | 2027 Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, principal amount |  | $ 150,000,000.0 |  |  |  |  |  |  |

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