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Fair Value Measurements - Assets Measured at Fair Value on Recurring Basis (Details) - Recurring - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Marketable securities - available for sale | $ 82,767 | $ 18,061
Assets, fair value disclosure | 82,767 | 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 | 82,767 | 18,061
Assets, fair value disclosure | 82,767 | 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

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