Investments and Fair Value Measurements - Quantitative Information about Level 3 Fair Value Measurements (Details) $ in Thousands	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
PropTech convertible trading debt securities	$ 1,162	$ 2,957
Recurring
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
PropTech convertible trading debt securities		1,875
Significant Unobservable Inputs (Level 3) | Recurring
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
PropTech convertible trading debt securities		1,875
Significant Unobservable Inputs (Level 3) | Recurring | PropTech convertible trading debt securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
PropTech convertible trading debt securities	$ 1,162	$ 2,957
Significant Unobservable Inputs (Level 3) | Recurring | PropTech convertible trading debt securities | Discounted cash flow | Interest rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Convertible trading debt securities input	0.05
Significant Unobservable Inputs (Level 3) | Recurring | PropTech convertible trading debt securities | Discounted cash flow | Interest rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Convertible trading debt securities input		0.04
Significant Unobservable Inputs (Level 3) | Recurring | PropTech convertible trading debt securities | Discounted cash flow | Interest rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Convertible trading debt securities input		0.08
Significant Unobservable Inputs (Level 3) | Recurring | PropTech convertible trading debt securities | Discounted cash flow | Volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Convertible trading debt securities input	0.4025
Significant Unobservable Inputs (Level 3) | Recurring | PropTech convertible trading debt securities | Discounted cash flow | Volatility | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Convertible trading debt securities input		0.607
Significant Unobservable Inputs (Level 3) | Recurring | PropTech convertible trading debt securities | Discounted cash flow | Volatility | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Convertible trading debt securities input		1.033
Significant Unobservable Inputs (Level 3) | Recurring | PropTech convertible trading debt securities | Discounted cash flow | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Convertible trading debt securities input	0.3037
Significant Unobservable Inputs (Level 3) | Recurring | PropTech convertible trading debt securities | Discounted cash flow | Discount rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Convertible trading debt securities input		0.2939
Significant Unobservable Inputs (Level 3) | Recurring | PropTech convertible trading debt securities | Discounted cash flow | Discount rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Convertible trading debt securities input		1.8615