Fair Value Measurements (Details) - Fair Value, Recurring - USD ($) $ in Thousands |
Sep. 30, 2021 |
Dec. 31, 2020 |
|---|---|---|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ||
| Equity securities | $ 1,052 | $ 1,768 |
| Assets, fair value | 1,052 | 1,768 |
| Route1 Inc | ||
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ||
| Equity securities | 1,052 | 1,768 |
| Fair Value, Inputs, Level 2 | ||
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ||
| Equity securities | 1,052 | 1,768 |
| Assets, fair value | 1,052 | 1,768 |
| Fair Value, Inputs, Level 2 | Route1 Inc | ||
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ||
| Equity securities | $ 1,052 | $ 1,768 |