Fair Value Measurements - Summary of Fair Value Assets Measured on Recurring Basis (Details) - USD ($) $ in Thousands		Sep. 30, 2021	Dec. 31, 2020
Fair value information related to assets
Assets		$ 53,904
Fair Value, Measurements, Recurring
Fair value information related to assets
Assets			$ 3,459
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1)
Fair value information related to assets
Assets		53,904	3,459
Fair Value, Measurements, Recurring | Money market funds
Fair value information related to assets
Assets	[1]	50,001	2
Fair Value, Measurements, Recurring | Money market funds | Quoted Prices in Active Markets (Level 1)
Fair value information related to assets
Assets	[1]	50,001	2
Fair Value, Measurements, Recurring | Other mutual funds
Fair value information related to assets
Assets		3,903	3,457	[2]
Fair Value, Measurements, Recurring | Other mutual funds | Quoted Prices in Active Markets (Level 1)
Fair value information related to assets
Assets		$ 3,903	$ 3,457	[2]

[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.