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DEBT - Long-term debt (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Instrument [Line Items] |  |
Total carrying amount of debt | $ 1,037,646 | $ 330,865
Less: current portion of convertible notes and long-term financing receivable recorded as debt | (86,052) | (325,967)
Debt, non-current | 951,594 | 4,898
Convertible Notes | Convertible Senior Notes Due 2028 |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | 575,000 | 0
Less unamortized discount and issuance costs | (149,411) | 0
Total carrying amount of debt | 425,589 | 0
Convertible Notes | Convertible Senior Notes Due 2026 |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | 632,500 | 0
Less unamortized discount and issuance costs | (111,433) | 0
Total carrying amount of debt | 521,067 | 0
Convertible Notes | Convertible Senior Notes Due 2025 |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | 102,175 | 320,000
Less unamortized discount and issuance costs | (16,123) | (64,979)
Total carrying amount of debt | 86,052 | 255,021
Less: current portion of convertible notes and long-term financing receivable recorded as debt | (102,200) |
Convertible Notes | Convertible Senior Notes Due 2024 |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | 0 | 88,140
Less unamortized discount and issuance costs | 0 | (19,119)
Total carrying amount of debt | 0 | 69,021
Convertible Notes | Convertible Senior Notes Due 2023 |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | 5,000 | 5,000
Less unamortized discount and issuance costs | (62) | (102)
Total carrying amount of debt | 4,938 | 4,898
Financing Receivable | Financing Receivable Recorded as Debt |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 0 | $ 1,925

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