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Investments - Schedule of Investments' Gross Unrealized Loss and Fair Value (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | $ 2,803 |
Unrealized Losses, Less than 12 Months | (11) |
Fair Value, 12 Months or More |  | $ 8,051
Unrealized Losses, 12 Months or More |  | (47)
Fair Value | 2,803 | 8,051
Unrealized Losses | (11) | (47)
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 | 1,995 |
Unrealized Losses, Less than 12 Months | (5) |
Fair Value, 12 Months or More |  | 7,053
Unrealized Losses, 12 Months or More |  | (39)
Fair Value | 1,995 | 7,053
Unrealized Losses | (5) | (39)
Corporate debt |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 808 |
Unrealized Losses, Less than 12 Months | (6) |
Fair Value, 12 Months or More |  | 998
Unrealized Losses, 12 Months or More |  | (8)
Fair Value | 808 | 998
Unrealized Losses | $ (6) | $ (8)

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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=121645371&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=121582814&loc=SL82922890-210455 + Details
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