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Fair Value Measurements (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2016
3.75% Convertible notes due 2023
Liabilities
Coupon interest rate			3.75%
5.00% Convertible notes due 2027 | Unsecured Debt
Liabilities
Coupon interest rate	5.00%
Level 1
Assets
Total cash equivalents	$ 398,834	$ 361,822
Liabilities
Total convertible notes payable	0	0
Level 1 | 3.75% Convertible notes due 2023
Liabilities
Total convertible notes payable	0	0
Level 1 | 5.00% Convertible notes due 2027
Liabilities
Total convertible notes payable	0	0
Level 1 | Money market funds
Assets
Total cash equivalents	398,834	361,822
Level 1 | Government-backed securities
Assets
Total cash equivalents	0	0
Level 1 | Corporate debt securities
Assets
Total cash equivalents	0	0
Level 1 | Agency securities
Assets
Total cash equivalents	0	0
Level 2
Assets
Total cash equivalents	400,536	1,056,922
Liabilities
Total convertible notes payable	494,900	447,509
Level 2 | 3.75% Convertible notes due 2023
Liabilities
Total convertible notes payable	322,111	447,509
Level 2 | 5.00% Convertible notes due 2027
Liabilities
Total convertible notes payable	172,789	0
Level 2 | Money market funds
Assets
Total cash equivalents	0	0
Level 2 | Government-backed securities
Assets
Total cash equivalents	296,000	266,250
Level 2 | Corporate debt securities
Assets
Total cash equivalents	0	790,672
Level 2 | Agency securities
Assets
Total cash equivalents	104,536	0
Level 3
Assets
Total cash equivalents	0	0
Liabilities
Total convertible notes payable	0	0
Level 3 | 3.75% Convertible notes due 2023
Liabilities
Total convertible notes payable	0	0
Level 3 | 5.00% Convertible notes due 2027
Liabilities
Total convertible notes payable	0	0
Level 3 | Money market funds
Assets
Total cash equivalents	0	0
Level 3 | Government-backed securities
Assets
Total cash equivalents	0	0
Level 3 | Corporate debt securities
Assets
Total cash equivalents	0	0
Level 3 | Agency securities
Assets
Total cash equivalents	$ 0	$ 0

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Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

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