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Fair Value Measurements - Fair Value by Contractual Maturity (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
One Year or Less | $ 88,702 | $ 111,409
Over One Year Through Five Years | 31,570 | 63,400
Over Five Years | 0 | 0
Total | 120,272 | 174,809
U.S. Treasury securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
One Year or Less | 31,880 | 40,795
Over One Year Through Five Years | 0 | 14,980
Over Five Years | 0 | 0
Total | 31,880 | 55,775
Yankee bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
One Year or Less | 2,550 | 2,734
Over One Year Through Five Years | 0 | 2,532
Over Five Years | 0 | 0
Total | 2,550 | 5,266
Agency bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
One Year or Less | 3,557 | 6,470
Over One Year Through Five Years | 2,349 | 5,899
Over Five Years | 0 | 0
Total | 5,906 | 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 | 11,831 | 11,811
Over Five Years | 0 | 0
Total | 11,831 | 11,811
Commercial paper |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
One Year or Less | 2,929 | 2,854
Over One Year Through Five Years | 0 | 0
Over Five Years | 0 | 0
Total | 2,929 | 2,854
Asset-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
One Year or Less | 15,357 | 23,179
Over One Year Through Five Years | 0 | 1,940
Over Five Years | 0 | 0
Total | 15,357 | 25,119
Corporate bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
One Year or Less | 32,429 | 35,377
Over One Year Through Five Years | 17,390 | 26,238
Over Five Years | 0 | 0
Total | $ 49,819 | $ 61,615

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