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Summary of Significant Accounting Policies - Summary of Cash, Cash Equivalents and Short-term Investments (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Cash and cash equivalents |  |
Cash | $ 52,812 | $ 51,560
Money market accounts | 159,150 | 146,477
Total cash and cash equivalents | 211,962 | 198,037
Marketable securities |  |
Marketable securities | 19,257 | 11,057
Corporate Bonds |  |
Marketable securities |  |
Marketable securities | 11,548 | 2,013
Agency Mortgage-backed Securities |  |
Marketable securities |  |
Marketable securities | 3,602 |
US Treasury Securities |  |
Marketable securities |  |
Marketable securities | $ 4,107 | $ 9,044

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