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Fair Value Measurement - Financial Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
U.S. Treasury bills
Financial Assets
U.S. Treasury bills	$ 318,047	$ 416,509
Fair Value, Recurring
Financial Assets
Total	357,777	435,002
Financial Liabilities
Contingent consideration	11,975	12,321
Fair Value, Recurring | U.S. Treasury bills
Financial Assets
U.S. Treasury bills	318,047	416,509
Fair Value, Recurring | Level 1
Financial Assets
Total	39,730	18,493
Financial Liabilities
Contingent consideration	0	0
Fair Value, Recurring | Level 1 | U.S. Treasury bills
Financial Assets
U.S. Treasury bills	0	0
Fair Value, Recurring | Level 2
Financial Assets
Total	318,047	416,509
Financial Liabilities
Contingent consideration	0	0
Fair Value, Recurring | Level 2 | U.S. Treasury bills
Financial Assets
U.S. Treasury bills	318,047	416,509
Fair Value, Recurring | Level 3
Financial Assets
Total	0	0
Financial Liabilities
Contingent consideration	11,975	12,321
Fair Value, Recurring | Level 3 | U.S. Treasury bills
Financial Assets
U.S. Treasury bills	0	0
Money market funds | Fair Value, Recurring
Financial Assets
Money market funds	39,730	18,493
Money market funds | Fair Value, Recurring | Level 1
Financial Assets
Money market funds	39,730	18,493
Money market funds | Fair Value, Recurring | Level 2
Financial Assets
Money market funds	0	0
Money market funds | Fair Value, Recurring | Level 3
Financial Assets
Money market funds	$ 0	$ 0

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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 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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