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Fair Value Measurements - Schedule of Amortized Cost (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | $ 199,464 | $ 67,590
Gross Unrealized Gains | 22 | 1
Gross Unrealized Losses | (923) | (45)
Fair Value | 198,563 | 67,546
Accrued interest receivable | 600 | 200
U.S. Treasury securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 52,791 | 21,357
Gross Unrealized Gains | 11 | 1
Gross Unrealized Losses | (138) | (18)
Fair Value | 52,664 | 21,340
Yankee bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 6,175 |
Gross Unrealized Gains | 1 |
Gross Unrealized Losses | (16) |
Fair Value | 6,160 |
Agency bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 17,546 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (16) |
Fair Value | 17,530 |
Municipal bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 12,440 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (211) |
Fair Value | 12,229 |
Commercial paper |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 17,694 | 14,543
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (4) | 0
Fair Value | 17,690 | 14,543
Asset-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 27,620 | 14,546
Gross Unrealized Gains | 1 | 0
Gross Unrealized Losses | (86) | (8)
Fair Value | 27,535 | 14,538
Corporate bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 65,198 | 17,144
Gross Unrealized Gains | 9 | 0
Gross Unrealized Losses | (452) | (19)
Fair Value | $ 64,755 | $ 17,125

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- 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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