Fair Value - Summary of the Company's Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Fair value
Debt securities	$ 407,344
Contingent consideration	29,100	$ 32,500
Recurring Basis
Fair value
Cash equivalents	1,872	41,849
Contingent consideration	29,061	32,451
Assets, Total	438,277	457,472
Recurring Basis \| Level 1
Fair value
Cash equivalents	1,872	41,849
Assets, Total	78,209	115,300
Recurring Basis \| Level 2
Fair value
Assets, Total	331,007	308,744
Recurring Basis \| Level 3
Fair value
Contingent consideration	29,061	32,451
Assets, Total	29,061	33,428
U.S. government and agency debt securities \| Recurring Basis
Fair value
Debt securities	113,796	103,345
U.S. government and agency debt securities \| Recurring Basis \| Level 1
Fair value
Debt securities	76,337	73,451
U.S. government and agency debt securities \| Recurring Basis \| Level 2
Fair value
Debt securities	37,459	29,894
Corporate debt securities \| Recurring Basis
Fair value
Debt securities	189,550	184,956
Corporate debt securities \| Recurring Basis \| Level 2
Fair value
Debt securities	189,550	183,979
Corporate debt securities \| Recurring Basis \| Level 3
Fair value
Debt securities		977
International government agency debt securities \| Recurring Basis
Fair value
Debt securities	103,998	94,871
International government agency debt securities \| Recurring Basis \| Level 2
Fair value
Debt securities	$ 103,998	$ 94,871

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).

+ References

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Amount of asset recognized arising from contingent consideration in a business combination.

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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.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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