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Cash, Cash Equivalents and Investments - Components of Cash, Cash Equivalents and Investments (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Cash | $ 266,609 | $ 155,498
Money market instruments | 2,464 | 15,933
Cash and cash equivalents | 269,073 | 171,431
Current investments, amortized cost of $102,258 and $235,610 in 2020 and 2019, respectively, allowance for credit losses of $0 in 2020 and 2019 | 103,240 | 240,470
Non-current investments | 395,125 | 433,452
Total | 767,438 | 845,353
Treasury Bills [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Current investments, amortized cost of $102,258 and $235,610 in 2020 and 2019, respectively, allowance for credit losses of $0 in 2020 and 2019 | 35,403 | 92,914
Long-term investments | 96,458 | 216,334
Asset-Backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Current investments, amortized cost of $102,258 and $235,610 in 2020 and 2019, respectively, allowance for credit losses of $0 in 2020 and 2019 | 25,160 | 66,680
Long-term investments | 67,058 | 46,403
Corporate Bonds [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Current investments, amortized cost of $102,258 and $235,610 in 2020 and 2019, respectively, allowance for credit losses of $0 in 2020 and 2019 | 32,714 | 65,624
Long-term investments | 203,428 | 146,474
Sovereign Bonds [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Current investments, amortized cost of $102,258 and $235,610 in 2020 and 2019, respectively, allowance for credit losses of $0 in 2020 and 2019 | 8,660 | 6,294
Long-term investments | 3,440 | 16,005
Municipal Bonds [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Current investments, amortized cost of $102,258 and $235,610 in 2020 and 2019, respectively, allowance for credit losses of $0 in 2020 and 2019 | 1,303 | 4,630
Long-term investments | 5,735 | 2,322
Certificates of Deposit [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Current investments, amortized cost of $102,258 and $235,610 in 2020 and 2019, respectively, allowance for credit losses of $0 in 2020 and 2019 | 0 | 4,328
Agency Bonds [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Long-term investments | $ 19,006 | $ 5,914

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