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INDEBTEDNESS - Convertible Note Hedge and Warrant Transactions Narrative (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands |  |  |  |  | 9 Months Ended | 55 Months Ended
--- | --- | --- | --- | --- | --- | ---
Nov. 13, 2020 | Mar. 05, 2020 | May 25, 2018 | Mar. 06, 2017 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021
Debt Instrument [Line Items] |  |  |  |  |  |  |
Proceeds from issuance of warrants |  |  |  |  | $ 0 | $ 99,500 |
Convertible Debt |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Conversion price of convertible debt (in USD per share) |  | $ 121.01 | $ 77.85 | $ 22.95 |  |  |
Conversion price of convertible debt after effect of warrants and note hedge (in USD per share) |  | $ 161.34 | $ 109.26 | $ 31.18 |  |  |
Convertible Debt | 2027 Convertible Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Conversion price of convertible debt (in USD per share) | $ 299.13 |  |  |  |  |  |
Conversion price of convertible debt after effect of warrants and note hedge (in USD per share) | 414.18 |  |  |  |  |  |
Convertible Debt | 2026 Convertible Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Conversion price of convertible debt (in USD per share) | 299.13 |  |  |  |  |  |
Conversion price of convertible debt after effect of warrants and note hedge (in USD per share) | $ 368.16 |  |  |  |  |  |
Common Stock Warrant, 2027 Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Warrants to purchase aggregate shares of capital stock (in shares) | 1,920 |  |  |  |  |  |
Warrants, weighted average exercise price (in USD per share) | $ 414.18 |  |  |  |  |  |
Proceeds from issuance of warrants | $ 68,000 |  |  |  |  |  |
Common Stock Warrant, 2026 Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Warrants to purchase aggregate shares of capital stock (in shares) | 1,920 |  |  |  |  |  |
Warrants, weighted average exercise price (in USD per share) | $ 368.16 |  |  |  |  |  |
Proceeds from issuance of warrants | $ 64,600 |  |  |  |  |  |
Common Stock Warrant, 2025 Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Warrants to purchase aggregate shares of capital stock (in shares) |  | 8,260 |  |  |  |  |
Warrants, weighted average exercise price (in USD per share) |  | $ 161.34 |  |  |  |  |
Proceeds from issuance of warrants |  | $ 99,500 |  |  |  |  |
Common Stock Warrant, 2023 Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Warrants to purchase aggregate shares of capital stock (in shares) |  |  | 11,100 |  |  |  |
Warrants, weighted average exercise price (in USD per share) |  |  | $ 109.26 |  |  |  |
Proceeds from issuance of warrants |  |  | $ 112,100 |  |  |  |
Shares of common stock received due to exercise of note hedges (in shares) |  |  |  |  | 1,300 |  |
Common Stock Warrant, 2022 Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Warrants to purchase aggregate shares of capital stock (in shares) |  |  |  | 19,200 |  |  |
Warrants, weighted average exercise price (in USD per share) |  |  |  | $ 31.18 |  |  |
Proceeds from issuance of warrants |  |  |  | $ 57,200 |  |  |
Shares of common stock received due to exercise of note hedges (in shares) |  |  |  |  | 5,500 |  | 14,900
Options Held |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Warrants to purchase aggregate shares of capital stock (in shares) | 1,920 | 8,260 | 11,100 | 19,200 |  |  |
Convertible note hedge, option to purchase common stock, price (in USD per share) | $ 299.13 | $ 121.01 | $ 77.85 | $ 22.95 |  |  |
Cost of convertible note hedge |  | $ 149,200 | $ 172,600 | $ 92,100 |  |  |
Options Held | 2027 Convertible Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Cost of convertible note hedge | $ 104,300 |  |  |  |  |  |
Options Held | 2026 Convertible Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Cost of convertible note hedge | $ 84,600 |  |  |  |  |  |

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