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Cash, Cash Equivalents and Short-Term Investments - Available-for-sale Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Cash, Cash Equivalents and Short-Term Investments
Amortized Cost	$ 305,791	$ 410,390
Unrealized Gains	3,578	1,248
Unrealized Losses	(502)	(24,687)
Fair Value	308,867	386,951
U.S. Treasury notes
Cash, Cash Equivalents and Short-Term Investments
Amortized Cost	127,887	199,626
Unrealized Gains	2,122	5
Unrealized Losses	(78)	(8,913)
Fair Value	129,931	190,718
Corporate debt securities
Cash, Cash Equivalents and Short-Term Investments
Amortized Cost	177,904	210,764
Unrealized Gains	1,456	1,243
Unrealized Losses	(424)	(15,774)
Fair Value	$ 178,936	$ 196,233

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

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- Definition

Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
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- Definition

Amortized cost excluding accrued interest, before allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479130/326-30-45-1

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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