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Significant Accounting Policies - Right-of-Use Assets and Related Lease Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Sep. 30, 2020 | Aug. 14, 2020 | Dec. 31, 2019 | Nov. 15, 2018
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Right of use assets | $ 25,526 |  |  | $ 27,082 |
Lease liabilities | $ 30,772 |  |  |  |
2023 Convertible Senior Notes |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Principal amount |  |  |  |  | $ 210,000
Interest rate (as a percent) |  |  |  |  | 6.25%
Principal amount of debt repurchased |  |  | $ 115,000 |  |
2026 Convertible Senior Notes |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Principal amount |  | $ 225,000 |  |  |
Interest rate (as a percent) |  | 5.25% |  |  |
Restatement Adjustment | Accounting Standards Update 2016-02 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Right of use assets |  |  |  | 17,700 |
Lease liabilities |  |  |  | 26,400 |
Reversal deferred rent credit |  |  |  | $ 8,700 |

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- Definition The cumulative difference between the rental payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense over the term of the leased property by the lessor or lessee, respectively. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121549951&loc=d3e39896-112707 + Details
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