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Financial Instruments - Summary of Financial assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Cash | $ 2,765 |  |  |
Adjusted Cost | 445,534 |  |  |
Unrealized Losses | (524) |  |  |
Debt Securities, Available-for-sale | 445,010 |  |  |
Cash and cash equivalents | 66,810 | $ 24,624 | $ 46,637 | $ 27,455
Marketable Securities | 378,200 | $ 0 |  |
Level 1 | Money market funds |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Adjusted Cost | 38,045 |  |  |
Debt Securities, Available-for-sale | 38,045 |  |  |
Cash and cash equivalents | 38,045 |  |  |
Level 2 |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Adjusted Cost | 404,724 |  |  |
Unrealized Losses | (524) |  |  |
Debt Securities, Available-for-sale | 404,200 |  |  |
Cash and cash equivalents | 26,000 |  |  |
Marketable Securities | 378,200 |  |  |
Level 2 | U.S. Government securities |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Adjusted Cost | 45,982 |  |  |
Unrealized Losses | (66) |  |  |
Debt Securities, Available-for-sale | 45,916 |  |  |
Marketable Securities | 45,916 |  |  |
Level 2 | U.S. Treasury securities |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Adjusted Cost | 80,500 |  |  |
Unrealized Losses | (7) |  |  |
Debt Securities, Available-for-sale | 80,493 |  |  |
Cash and cash equivalents | 26,000 |  |  |
Marketable Securities | 54,493 |  |  |
Level 2 | Commercial paper |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Adjusted Cost | 94,887 |  |  |
Unrealized Losses | (15) |  |  |
Debt Securities, Available-for-sale | 94,872 |  |  |
Marketable Securities | 94,872 |  |  |
Level 2 | Corporate bonds |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Adjusted Cost | 182,338 |  |  |
Unrealized Losses | (435) |  |  |
Debt Securities, Available-for-sale | 181,903 |  |  |
Marketable Securities | 181,903 |  |  |
Level 2 | Municipal securities |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Adjusted Cost | 1,017 |  |  |
Unrealized Losses | (1) |  |  |
Debt Securities, Available-for-sale | 1,016 |  |  |
Marketable Securities | 1,016 |  |  |
Level 3 |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Financial liabilities, Fair value | 1,060 |  |  |
Level 3 | Warrant liabilities |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Financial liabilities, Adjusted cost | 1,060 |  |  |
Financial liabilities, Fair value | $ 1,060 |  |  |

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