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Fair Value Measurements - Schedule of Amortized Cost (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | $ 145,682 | $ 179,248
Gross Unrealized Gains | 16 | 13
Gross Unrealized Losses | (3,392) | (4,452)
Fair Value | 142,306 | 174,809
Accrued interest receivable | 1,000 | 900
U.S. Treasury securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 37,054 | 56,426
Gross Unrealized Gains | 1 | 0
Gross Unrealized Losses | (351) | (651)
Fair Value | 36,704 | 55,775
Yankee bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 3,357 | 5,358
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (78) | (92)
Fair Value | 3,279 | 5,266
Agency bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 6,010 | 12,485
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (74) | (116)
Fair Value | 5,936 | 12,369
Municipal bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 12,804 | 12,841
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (902) | (1,030)
Fair Value | 11,902 | 11,811
Commercial paper |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 2,888 | 2,846
Gross Unrealized Gains | 5 | 8
Gross Unrealized Losses | 0 | 0
Fair Value | 2,893 | 2,854
Asset-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 21,433 | 25,544
Gross Unrealized Gains | 0 | 2
Gross Unrealized Losses | (291) | (427)
Fair Value | 21,142 | 25,119
Corporate bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 62,136 | 63,748
Gross Unrealized Gains | 10 | 3
Gross Unrealized Losses | (1,696) | (2,136)
Fair Value | $ 60,450 | $ 61,615

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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 https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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