Fair Value Measurements - Assets Measured at Fair Value on Recurring Basis (Details) - Recurring - USD ($) $ in Thousands |
Sep. 30, 2021 |
Dec. 31, 2020 |
---|---|---|
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
Marketable securities - available for sale | $ 87,377 | $ 18,061 |
Assets, fair value disclosure | 87,377 | 18,061 |
Level 1 | ||
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
Marketable securities - available for sale | 0 | 0 |
Assets, fair value disclosure | 0 | 0 |
Level 2 | ||
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
Marketable securities - available for sale | 87,377 | 18,061 |
Assets, fair value disclosure | 87,377 | 18,061 |
Level 3 | ||
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
Marketable securities - available for sale | 0 | 0 |
Assets, fair value disclosure | $ 0 | $ 0 |