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Long-term Debt - Convertible Senior Notes Carrying Value (Details) - Senior Notes - USD ($) | 6 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020 | Aug. 31, 2020 | Oct. 31, 2018 | Oct. 24, 2018 | Oct. 22, 2018 | Dec. 31, 2016
2024 Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Carrying value | $ 85,320,000 | $ 81,462,000 |  |  |  |  |
Unamortized debt discount and issuance costs | 31,731,000 | 35,589,000 |  |  |  |  |
Principal amount | $ 117,051,000 | $ 117,051,000 | $ 117,100,000 |  |  |  |
Remaining amortization period (years) | 3 years 4 months 24 days | 3 years 10 months 24 days |  |  |  |  |
2024 Notes | Level 2 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Fair value | $ 132,054,000 | $ 153,220,000 |  |  |  |  |
2025 Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Carrying value | 121,230,000 | 116,349,000 |  |  |  |  |
Unamortized debt discount and issuance costs | 51,270,000 | 56,151,000 |  |  |  |  |
Principal amount | $ 172,500,000 | $ 172,500,000 |  | $ 172,500,000 | $ 22,500,000 | $ 150,000,000.0 |
Remaining amortization period (years) | 4 years 3 months 18 days | 4 years 9 months 18 days |  |  |  |  |
2025 Notes | Level 2 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Fair value | $ 165,974,000 | $ 147,488,000 |  |  |  |  |
2021 Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Carrying value | 26,655,000 | 26,557,000 |  |  |  |  |
Unamortized debt discount and issuance costs | 82,000 | 180,000 |  |  |  |  |
Principal amount | $ 26,737,000 | $ 26,737,000 |  |  |  |  | $ 125,000,000.0
Remaining amortization period (years) | 4 months 24 days | 10 months 24 days |  |  |  |  |
2021 Notes | Level 2 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Fair value | $ 29,279,000 | $ 26,470,000 |  |  |  |  |

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- Definition Including the current and noncurrent portions, carrying amount of debt identified as being convertible into another form of financial instrument (typically the entity's common stock) as of the balance sheet date, which originally required full repayment more than twelve months after issuance or greater than the normal operating cycle of the company. + References Reference 1: 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(a)(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 2: 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 3: 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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- 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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