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Cash, Cash Equivalents and Short-Term Investments - Contractual Maturities (Details) - USD ($)	Jun. 30, 2022	Dec. 31, 2021
Cash, Cash Equivalents and Short-Term Investments
Due within one year, Amortized Cost	$ 77,695,000	$ 39,081
Due after one year through five years, Amortized Cost	352,703,000	328,776
Due after five years through ten years, Amortized Cost		15,690
Total, Amortized Cost	430,398,000	383,547
Due within one year, Fair Value	76,845,000	39,035
Due after one year through five years, Fair Value	334,225,000	325,047
Due after five years through ten years, Fair Value		15,610
Total, Fair Value	$ 411,070,000	$ 379,692

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- Definition

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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