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Debt - Summary of Information about the Equity and Liability Components of Notes (Details) - USD ($) | Dec. 31, 2020 | Feb. 10, 2020 | Dec. 31, 2019 | Apr. 15, 2019
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Debt Instrument [Line Items] |  |  |  |
Total notes payable | $ 105,844,000 |  | $ 62,414,000 |
Convertible Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Contractual interest expense | 4,026,000 |  | 2,550,000 | $ 80,000,000.0
Unamortized discount (including unamortized debt issuance cost) | 4,355,000 |  | 2,529,000 |
Total notes payable | 8,381,000 |  | 5,079,000 |
Convertible Debt | Convertible Senior Notes Due 2024 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Contractual interest expense | 13,750,000 |  | 80,000,000 |
Unamortized discount (including unamortized debt issuance cost) | (2,619,000) |  | (18,955,000) |
Total notes payable | 11,131,000 |  | $ 61,045,000 |
Convertible Debt | Convertible Senior Notes Due 2026 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Contractual interest expense | 120,000,000 | $ 120,000,000.0 |  |
Unamortized discount (including unamortized debt issuance cost) | (25,986,000) |  |  |
Total notes payable | $ 94,014,000 |  |  |

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- Definition Amount of unamortized debt discount (premium) and debt issuance costs. + 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)(2) -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 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28555-108399 + Details
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- Definition Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: 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 + Details
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