Description of Business and Summary of Significant Accounting Policies - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Assets
Total assets measured at fair value	$ 20,769	$ 32,453
Liabilities
Total liabilities measured at fair value	2,563	0
Fair Value, Recurring \| Certificates of Deposit
Assets
Available-for-sale Securities	7,400	7,400
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)
Assets
Total assets measured at fair value	174	381
Liabilities
Total liabilities measured at fair value	0	0
Significant Other Observable Inputs (Level 2)
Assets
Total assets measured at fair value	20,595	32,072
Liabilities
Total liabilities measured at fair value	0	0
Significant Unobservable Inputs (Level 3)
Assets
Total assets measured at fair value	0	0
Liabilities
Total liabilities measured at fair value	2,563	0
Contingent Accrued Earn-out Acquisition Consideration
Liabilities
Derivative liabilities	2,563	0
Contingent Accrued Earn-out Acquisition Consideration \| Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)
Liabilities
Derivative liabilities	0	0
Contingent Accrued Earn-out Acquisition Consideration \| Significant Other Observable Inputs (Level 2)
Liabilities
Derivative liabilities	0	0
Contingent Accrued Earn-out Acquisition Consideration \| Significant Unobservable Inputs (Level 3)
Liabilities
Derivative liabilities	2,563	0
Certificates of Deposit
Assets
Available-for-sale Securities	20,595	32,072
Certificates of Deposit \| Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)
Assets
Available-for-sale Securities	0	0
Certificates of Deposit \| Significant Other Observable Inputs (Level 2)
Assets
Available-for-sale Securities	20,595	32,072
Certificates of Deposit \| Significant Unobservable Inputs (Level 3)
Assets
Available-for-sale Securities	0	0
Mutual Funds
Assets
Available-for-sale Securities	174	381
Mutual Funds \| Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)
Assets
Available-for-sale Securities	174	381
Mutual Funds \| Significant Other Observable Inputs (Level 2)
Assets
Available-for-sale Securities	0	0
Mutual Funds \| Significant Unobservable Inputs (Level 3)
Assets
Available-for-sale Securities	$ 0	$ 0

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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Fair value of financial and nonfinancial obligations.

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