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Fair Value Measurements - Financial Assets and Liabilities (Details) - Recurring - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Assets: |  |
Money market funds | $ 518,236 | $ 0
Total assets | 518,236 | 0
Liabilities: |  |
Total liabilities | 0 | 0
Contingent earn-out |  |
Liabilities: |  |
Contingent earn-out | 0 | 0
Level 1 |  |
Assets: |  |
Money market funds | 518,236 | 328,195
Total assets | 518,236 | 328,195
Liabilities: |  |
Total liabilities | 0 | 0
Level 1 | Contingent earn-out |  |
Liabilities: |  |
Contingent earn-out | 0 | 0
Level 2 |  |
Assets: |  |
Money market funds | 0 | 0
Total assets | 0 | 0
Liabilities: |  |
Total liabilities | 0 | 0
Level 2 | Contingent earn-out |  |
Liabilities: |  |
Contingent earn-out | 0 | 0
Level 3 |  |
Assets: |  |
Money market funds | 0 | 0
Total assets | 0 | 0
Liabilities: |  |
Total liabilities | 0 | 0
Level 3 | Contingent earn-out |  |
Liabilities: |  |
Contingent earn-out | $ 0 | $ 0

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- Definition Amount of liability recognized arising from contingent consideration in a business combination, expected to be settled within one year or the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph b -URI http://asc.fasb.org/extlink&oid=116859824&loc=d3e6819-128478 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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