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Debt - Schedule of Interest Expense (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Debt Instrument |  |
Amortization of debt discount and issuance costs | $ 8,471 | $ 0
Interest expense | 12,568 | 1,507
Convertible Senior Notes Due 2025 | Convertible Debt |  |
Debt Instrument |  |
Contractual interest expense related to the 2025 Notes | 2,803 | 0
Amortization of debt discount and issuance costs | 8,471 | 0
Master Vehicle Loan |  |
Debt Instrument |  |
Interest expense related to vehicle loans | $ 1,294 | $ 1,507

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- Definition Amount of amortization expense attributable to debt discount (premium) and debt issuance costs. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28555-108399 + Details
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