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Fair Value Measurements - Summary of Fair Value Assets Measured on Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Fair value information related to assets |  |  |
Assets |  | $ 3,972 | $ 3,459
Quoted Prices in Active Markets (Level 1) |  |  |
Fair value information related to assets |  |  |
Assets |  | 3,972 | 3,459
Money market funds |  |  |
Fair value information related to assets |  |  |
Assets | [1] | 2 | 2
Money market funds | Quoted Prices in Active Markets (Level 1) |  |  |
Fair value information related to assets |  |  |
Assets | [1] | 2 | 2
Other mutual funds |  |  |
Fair value information related to assets |  |  |
Assets | [2] | 3,970 | 3,457
Other mutual funds | Quoted Prices in Active Markets (Level 1) |  |  |
Fair value information related to assets |  |  |
Assets | [2] | $ 3,970 | $ 3,457
[1] | We include money market funds in “Cash and cash equivalents” in the Condensed Consolidated Balance Sheets. We classify these investments as available-for-sale and record them at fair value. There have been no realized gains or losses related to these investments and we have not experienced any redemption restrictions with respect to any of the money market mutual funds.
[2] | We include other mutual funds in “Other investments and assets” in the Condensed Consolidated Balance Sheets.

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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