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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Recent Accounting Pronouncements (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 29, 2020 | Mar. 31, 2019 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity |  |  | $ 3,457,590 | $ 1,730,686 | $ 3,457,590 | $ 1,730,686 | $ 3,559,101 | $ 3,648,995 | $ 2,235,552 | $ 1,887,433 | $ 1,895,843 | $ 1,957,639 |
Increase in current portion of convertible notes |  |  | 313,104 |  | 313,104 |  |  |  | 312,716 |  |  |  |
Increase in convertible notes, net |  |  | 1,865,647 |  | 1,865,647 |  |  |  | 1,861,685 |  |  |  |
Interest income (expense) |  |  | (4,680) | (4,478) | (13,948) | (63,382) |  |  |  |  |  |  |
Tax expense (benefit) |  |  | $ (3,858) | $ (2,752) | $ (242,638) | $ (5,294) |  |  |  |  |  |  |
Increase (decrease) in net loss per share (in usd per share) |  |  | $ (0.97) | $ (1.35) | $ (2.19) | $ (2.71) |  |  |  |  |  |  |
Increase (decrease) in net loss per share (in usd per share) |  |  | $ (0.97) | $ (1.35) | $ (2.19) | $ (2.71) |  |  |  |  |  |  |
Loss on settlement of convertible notes | $ 50,800 | $ 187,700 | $ 0 | $ 0 | $ 0 | $ 50,819 |  |  |  |  |  |  |
Additional Paid-In Capital |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity |  |  | 5,876,644 | 3,355,660 | 5,876,644 | 3,355,660 | 5,811,286 | 5,723,977 | 4,279,327 | 3,309,468 | 3,252,998 | 3,178,552 |
Accumulated Deficit​ |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity |  |  | $ (2,420,910) | (1,627,563) | $ (2,420,910) | (1,627,563) | $ (2,253,972) | $ (2,077,060) | (2,045,896) | $ (1,425,025) | $ (1,356,933) | (1,222,290) |
2025 notes |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on settlement of convertible notes |  |  |  |  |  | 42,900 |  |  |  |  |  |  |
Extinguishment of debt, amount |  |  |  |  |  | 100,000 |  |  |  |  |  |  |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred tax assets, net |  |  |  |  |  |  |  |  | 146,000 |  |  | 83,200 | $ 55,700
Deferred tax assets, valuation allowance |  |  |  |  |  |  |  |  | 135,800 |  |  | 74,700 | 55,700
Deferred tax liability |  |  |  |  |  |  |  |  | (10,200) |  |  | (8,500) |
Increase in current portion of convertible notes |  |  |  |  |  |  |  |  | 57,300 |  |  |  |
Increase in convertible notes, net |  |  |  |  |  |  |  |  | 540,900 |  |  |  |
Interest income (expense) |  |  |  | 19,100 |  | 8,300 |  |  |  |  |  |  |
Tax expense (benefit) |  |  |  | $ 1,800 |  | $ (1,800) |  |  |  |  |  |  |
Increase (decrease) in net loss per share (in usd per share) |  |  |  | $ 0.12 |  | $ (0.04) |  |  |  |  |  |  |
Increase (decrease) in net loss per share (in usd per share) |  |  |  | $ 0.12 |  | $ (0.04) |  |  |  |  |  |  |
Decrease in amortization debt discount |  |  |  |  |  | $ 51,200 |  |  |  |  |  |  |
Cumulative Effect, Period of Adoption, Adjustment | Additional Paid-In Capital |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity |  |  |  |  |  |  |  |  | (510,300) |  |  | (227,800) | (260,200)
Cumulative Effect, Period of Adoption, Adjustment | Accumulated Deficit​ |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity |  |  |  |  |  |  |  |  | $ (77,700) |  |  | $ (102,600) | $ 26,600

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