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Investments - Schedule of Investments' Gross Unrealized Loss and Fair Value (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | $ 20,712 | $ 2,803
Unrealized Losses, Less than 12 Months | (384) | (11)
Fair Value, 12 Months or More | 959 | 0
Unrealized Losses, 12 Months or More | (41) | 0
Fair Value | 21,671 | 2,803
Unrealized Losses | (425) | (11)
U.S. Treasury securities, obligations of U.S. Government agencies and Municipalities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 16,792 | 1,995
Unrealized Losses, Less than 12 Months | (322) | (5)
Fair Value, 12 Months or More | 959 | 0
Unrealized Losses, 12 Months or More | (41) | 0
Fair Value | 17,751 | 1,995
Unrealized Losses | (363) | (5)
Corporate debt |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 3,920 | 808
Unrealized Losses, Less than 12 Months | (62) | (6)
Fair Value, 12 Months or More | 0 | 0
Unrealized Losses, 12 Months or More | 0 | 0
Fair Value | 3,920 | 808
Unrealized Losses | $ (62) | $ (6)

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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 + Details
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