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Fair Value Measurements - Fair Value by Contractual Maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
One Year or Less | $ 93,386 | $ 111,409
Over One Year Through Five Years | 48,920 | 63,400
Over Five Years | 0 | 0
Total | 142,306 | 174,809
U.S. Treasury securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
One Year or Less | 29,416 | 40,795
Over One Year Through Five Years | 7,288 | 14,980
Over Five Years | 0 | 0
Total | 36,704 | 55,775
Yankee bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
One Year or Less | 3,279 | 2,734
Over One Year Through Five Years | 0 | 2,532
Over Five Years | 0 | 0
Total | 3,279 | 5,266
Agency bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
One Year or Less | 3,573 | 6,470
Over One Year Through Five Years | 2,363 | 5,899
Over Five Years | 0 | 0
Total | 5,936 | 12,369
Municipal bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
One Year or Less | 0 | 0
Over One Year Through Five Years | 11,902 | 11,811
Over Five Years | 0 | 0
Total | 11,902 | 11,811
Commercial paper |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
One Year or Less | 2,893 | 2,854
Over One Year Through Five Years | 0 | 0
Over Five Years | 0 | 0
Total | 2,893 | 2,854
Asset-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
One Year or Less | 21,142 | 23,179
Over One Year Through Five Years | 0 | 1,940
Over Five Years | 0 | 0
Total | 21,142 | 25,119
Corporate bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
One Year or Less | 33,083 | 35,377
Over One Year Through Five Years | 27,367 | 26,238
Over Five Years | 0 | 0
Total | $ 60,450 | $ 61,615

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