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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
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

X

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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Contractual interest rate for funds borrowed, under the debt agreement.

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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.

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Present value of lessee's discounted obligation for lease payments from operating lease.

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Amount of lessee's right to use underlying asset under operating lease.

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