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DEBT - Long-term debt (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Instrument [Line Items] |  |
Total carrying amount of debt | $ 1,002,229 | $ 330,865
Less: current portion of convertible notes and long-term financing receivable recorded as debt | (84,356) | (325,967)
Long-term debt | 917,873 | 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 | (164,905) | 0
Total carrying amount of debt | 410,095 | 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 | (129,630) | 0
Total carrying amount of debt | 502,870 | 0
Convertible Notes | Convertible Senior Notes Due 2025 |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | 102,260 | 320,000
Less unamortized discount and issuance costs | (19,657) | (64,979)
Total carrying amount of debt | 82,603 | 255,021
Less: current portion of convertible notes and long-term financing receivable recorded as debt | (102,300) |
Convertible Notes | Convertible Senior Notes Due 2024 |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | 1,068 | 88,140
Less unamortized discount and issuance costs | (217) | (19,119)
Total carrying amount of debt | 851 | 69,021
Less: current portion of convertible notes and long-term financing receivable recorded as debt | (900) |
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 | (92) | (102)
Total carrying amount of debt | 4,908 | 4,898
Financing Receivable | Financing Receivable Recorded as Debt |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 902 | $ 1,925

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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