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CONVERTIBLE NOTES - Schedule of Convertible Notes (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Feb. 29, 2020 | Mar. 31, 2019 | Jun. 30, 2018 | Jan. 31, 2018
--- | --- | --- | --- | --- | --- | ---
Convertible Notes Payable2030 |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Interest rate (as a percent) | 2.00% |  |  |  |  |
Principal Amount | $ 572,993 |  |  |  |  |
Unamortized Debt Discount and Issuance Costs | (4,349) |  |  |  |  |
Net Carrying Amount | 568,644 |  |  |  |  |
Convertible Notes Payable2030 | Significant Other Observable Inputs (Level 2) | Fair Value |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Amount | $ 684,475 |  |  |  |  |
2028 Convertible notes |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Interest rate (as a percent) | 0.375% | 0.375% | 0.375% |  |  |
Principal Amount | $ 949,042 | $ 1,150,000 |  |  |  |
Unamortized Debt Discount and Issuance Costs | (10,499) | (15,775) |  |  |  |
Net Carrying Amount | 938,543 | 1,134,225 |  |  |  |
2028 Convertible notes | Significant Other Observable Inputs (Level 2) | Fair Value |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Amount | $ 887,354 | $ 908,500 |  |  |  |
2027 Convertible notes |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Interest rate (as a percent) | 0.375% | 0.375% |  | 0.375% |  |
Principal Amount | $ 563,822 | $ 747,500 |  |  |  |
Unamortized Debt Discount and Issuance Costs | (5,429) | (9,445) |  |  |  |
Net Carrying Amount | 558,393 | 738,055 |  |  |  |
2027 Convertible notes | Significant Other Observable Inputs (Level 2) | Fair Value |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Amount | $ 549,839 | $ 612,950 |  |  |  |
2025 Convertible notes |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Interest rate (as a percent) | 1.00% | 1.00% |  |  | 1.00% | 1.00%
Principal Amount | $ 249,172 | $ 315,005 |  |  |  |
Unamortized Debt Discount and Issuance Costs | (476) | (1,179) |  |  |  |
Net Carrying Amount | 248,696 | 313,826 |  |  |  |
2025 Convertible notes | Significant Other Observable Inputs (Level 2) | Fair Value |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Amount | $ 293,300 | $ 326,808 |  |  |  |

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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of a written promise to pay a note, initially due after one year or beyond the operating cycle if longer, which can be exchanged for a specified amount of one or more securities (typically common stock), at the option of the issuer or the holder. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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