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STOCKHOLDERS' EQUITY - Common Stock, Warrants, Conversion of Convertible Notes and Exercise Convertible Note Hedges Narrative (Details) | 9 Months Ended | 55 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2021 vote $ / shares shares | Sep. 30, 2021 $ / shares shares | Dec. 31, 2020 $ / shares shares | Nov. 13, 2020 $ / shares shares | Mar. 05, 2020 $ / shares shares | May 25, 2018 $ / shares shares | Mar. 06, 2017 $ / shares shares
2023 Convertible Notes | Convertible Debt |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Shares issued upon conversion (in shares) | 2,800,000 |  |  |  |  |  |
Common Stock Warrant, 2022 Notes |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Warrants to purchase aggregate shares of capital stock (in shares) |  |  |  |  |  |  | 19,200,000
Warrants, weighted average exercise price (in USD per share) | $ / shares |  |  |  |  |  |  | $ 31.18
Number of warrants exercised (in shares) | 0 | 0 |  |  |  |  |
Shares of common stock received due to exercise of note hedges (in shares) | 5,500,000 | 14,900,000 |  |  |  |  |
Common Stock Warrant, 2023 Notes |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Warrants to purchase aggregate shares of capital stock (in shares) |  |  |  |  |  | 11,100,000 |
Warrants, weighted average exercise price (in USD per share) | $ / shares |  |  |  |  |  | $ 109.26 |
Number of warrants exercised (in shares) | 0 | 0 |  |  |  |  |
Shares of common stock received due to exercise of note hedges (in shares) | 1,300,000 |  |  |  |  |  |
Common Stock Warrant, 2025 Notes |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Warrants to purchase aggregate shares of capital stock (in shares) |  |  |  |  | 8,260,000 |  |
Warrants, weighted average exercise price (in USD per share) | $ / shares |  |  |  |  | $ 161.34 |  |
Number of warrants exercised (in shares) | 0 | 0 |  |  |  |  |
Common Stock Warrant, 2026 Notes |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Warrants to purchase aggregate shares of capital stock (in shares) |  |  |  | 1,920,000 |  |  |
Warrants, weighted average exercise price (in USD per share) | $ / shares |  |  |  | $ 368.16 |  |  |
Number of warrants exercised (in shares) | 0 | 0 |  |  |  |  |
Common Stock Warrant, 2027 Notes |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Warrants to purchase aggregate shares of capital stock (in shares) |  |  |  | 1,920,000 |  |  |
Warrants, weighted average exercise price (in USD per share) | $ / shares |  |  |  | $ 414.18 |  |  |
Number of warrants exercised (in shares) | 0 | 0 |  |  |  |  |
Class A |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Common stock, number of votes entitled for each share held (in votes) | vote | 1 |  |  |  |  |  |
Common stock, authorized (in shares) | 1,000,000,000 | 1,000,000,000 | 1,000,000,000 |  |  |  |
Common stock, par value (in USD per share) | $ / shares | $ 0.0000001 | $ 0.0000001 | $ 0.0000001 |  |  |  |
Common stock, outstanding (in shares) | 398,878,883 | 398,878,883 | 390,187,079 |  |  |  |
Class B |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Common stock, number of votes entitled for each share held (in votes) | vote | 10 |  |  |  |  |  |
Common stock, authorized (in shares) | 500,000,000 | 500,000,000 | 500,000,000 |  |  |  |
Common stock, par value (in USD per share) | $ / shares | $ 0.0000001 | $ 0.0000001 | $ 0.0000001 |  |  |  |
Common stock, outstanding (in shares) | 62,100,770 | 62,100,770 | 65,997,697 |  |  |  |

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