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Cash, Cash Equivalents, Restricted Cash and Short-Term Investments - Investments (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Marketable Securities [Line Items] |  |
Amortized Cost | $ 377,366 | $ 446,897
Unrealized Gains | 4 | 0
Unrealized Losses | (726) | (47)
Estimated Fair Value | 376,644 | 446,850
Total held to maturity securities at amortized cost |  | 19,228
Total cash, cash equivalents, restricted cash and short-term investments | 376,600 | 466,078
Cash, cash equivalents and restricted cash |  |
Marketable Securities [Line Items] |  |
Amortized Cost | 86,052 | 231,900
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Estimated Fair Value | 86,052 | 231,900
Certificates of deposit |  |
Marketable Securities [Line Items] |  |
Amortized Cost | 4,900 | 3,144
Unrealized Gains | 4 | 0
Unrealized Losses | 0 | (4)
Estimated Fair Value | 4,904 | 3,140
Corporate bond |  |
Marketable Securities [Line Items] |  |
Amortized Cost | 98,448 | 2,592
Unrealized Gains | 0 | 0
Unrealized Losses | (380) | (1)
Estimated Fair Value | 98,068 | 2,591
Commercial paper |  |
Marketable Securities [Line Items] |  |
Amortized Cost | 112,833 | 206,764
Unrealized Gains | 0 | 0
Unrealized Losses | (200) | (40)
Estimated Fair Value | 112,633 | 206,724
Treasury bill |  |
Marketable Securities [Line Items] |  |
Amortized Cost | 26,721 | 2,497
Unrealized Gains | 0 | 0
Unrealized Losses | (17) | (2)
Estimated Fair Value | 26,704 | $ 2,495
Treasury bond |  |
Marketable Securities [Line Items] |  |
Amortized Cost | 44,670 |
Unrealized Gains | 0 |
Unrealized Losses | (117) |
Estimated Fair Value | 44,553 |
Yankee bond |  |
Marketable Securities [Line Items] |  |
Amortized Cost | 3,742 |
Unrealized Gains | 0 |
Unrealized Losses | (12) |
Estimated Fair Value | $ 3,730 |

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- Definition Amount, after allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity), classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=124260329&loc=d3e26610-111562 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=124260329&loc=d3e26626-111562 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27232-111563 + Details
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