Marketable Investment Securities, Restricted Cash and Cash Equivalents, and Other Investment Securities - Fair Value Measurements (Details) - Fair value measurements on recurring basis - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Fair value of marketable securities
Cash equivalents (including restricted)	$ 114,125	$ 650,523
Total	44,113	282,733
U.S. Treasury and agency securities
Fair value of marketable securities
Debt securities		7,727
Commercial paper
Fair value of marketable securities
Debt securities	43,100	227,787
Corporate securities
Fair value of marketable securities
Debt securities	874	46,764
Other (including restricted)
Fair value of marketable securities
Debt securities	139	455
Level 1
Fair value of marketable securities
Cash equivalents (including restricted)	65,366	99,437
Total		7,727
Level 1 \| U.S. Treasury and agency securities
Fair value of marketable securities
Debt securities		7,727
Level 2
Fair value of marketable securities
Cash equivalents (including restricted)	48,759	551,086
Total	44,113	275,006
Level 2 \| Commercial paper
Fair value of marketable securities
Debt securities	43,100	227,787
Level 2 \| Corporate securities
Fair value of marketable securities
Debt securities	874	46,764
Level 2 \| Other (including restricted)
Fair value of marketable securities
Debt securities	$ 139	$ 455

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