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Summary of Significant Accounting Policies - Fair value measurements (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Level 2 |  |
Fair Value |  |
Convertible senior notes | $ 1,272,766 | $ 135,320
Level 3 |  |
Fair Value |  |
Contingent consideration | 9,760 |
Convertible senior notes |  | 53,455
Long-term debt | 175,402 | 112,169
Finance obligations | 181,553 | 144,089
Carrying value |  |
Fair Value |  |
Contingent consideration | 9,760 |
Convertible senior notes | 85,640 | 110,431
Long-term debt | 175,402 | 112,169
Finance obligations | 181,553 | 144,089
Fair value |  |
Fair Value |  |
Contingent consideration | 9,760 |
Convertible senior notes | 1,272,766 | 188,775
Long-term debt | 175,402 | 112,169
Finance obligations | $ 181,553 | $ 144,089

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- Definition The fair value amount of contingent consideration whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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Balance Type: | debit
Period Type: | instant

X
- Definition The fair value amount of finance obligations whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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- Definition Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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- Details
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- Details
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