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Summary of Significant Accounting Policies - Additional Information (Details) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 item segment | Mar. 31, 2020 USD ($)
Off Balance Sheet Risk and Concentrations of Credit Risk |  |
Number of federally insured financial institutions | item | 2 |
Segment Information |  |
Number of operating segments | 1 |
Number of reporting segments | 1 |
Revenue Recognition |  |
Payment terms | 45 days |
Accounts receivable standard payment terms | 45 days |
Unrealized gains on marketable securities, reclassified from additional paid-in capital to accumulated other comprehensive income | $ |  | $ 63,000

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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8672-108599 + Details
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