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Cash, Cash Equivalents and Investments - Components of Cash, Cash Equivalents and Investments (Detail) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Debt Securities, Available-for-sale [Line Items] |  |
Cash | $ 180,959 | $ 185,624
Money market instruments | 415 | 537
Cash and cash equivalents | 181,374 | 186,161
Debt securities, available-for-sale, current | 218,759 | 137,455
Non-current investments | 454,117 | 583,748
Total | 854,250 | 907,364
Treasury Bills [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale, current | 11,332 | 18,912
Long-term investments | 44,214 | 39,753
Asset-Backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale, current | 26,890 | 37,655
Long-term investments | 33,539 | 43,940
Corporate Bonds [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale, current | 164,055 | 73,088
Long-term investments | 374,440 | 481,218
Sovereign Bonds [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Long-term investments | 1,924 | 2,119
Municipal Bonds [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale, current | 624 | 4,998
Long-term investments | 0 | 641
Agency Bonds [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale, current | 15,858 | 2,802
Long-term investments | $ 0 | $ 16,077

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