Equity and Long-term Investments and Fair Value Measurements - Available-for-Sale Securities (Details) - USD ($)	Sep. 30, 2023		Dec. 31, 2022
Available-for-Sale Securities
Amortized Cost	$ 134,287,000		$ 263,469,000
Gross Unrealized Gains	0		0
Gross Unrealized Losses	0		0
Estimated Fair Value	134,287,000		263,469,000
Credit loss	0
Money market funds
Available-for-Sale Securities
Amortized Cost	134,287,000	[1]	263,469,000	[2]
Gross Unrealized Gains	0	[1]	0	[2]
Gross Unrealized Losses	0	[1]	0	[2]
Estimated Fair Value	$ 134,287,000	[1]	$ 263,469,000	[2]

[1] Money market funds are included in cash and cash equivalents in the condensed consolidated balance sheets

[2] Money market funds are included in cash and cash equivalents in the condensed consolidated balance sheets