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Cash, Cash Equivalents and Investments - Gross Unrealized Losses and Fair Value for Available-for-Sale Investments (Detail) $ in Thousands | Dec. 31, 2021 USD ($)
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Debt Securities, Available-for-sale [Line Items] |
Fair Value, Less than 12 months | $ 525,868
Unrealized Losses, Less than 12 months | (4,896)
Fair Value, Greater than 12 Months | 7,808
Unrealized Losses, Greater than 12 Months | (75)
Fair Value | 533,676
Unrealized Losses | (4,971)
Treasury Bills [Member] |
Debt Securities, Available-for-sale [Line Items] |
Fair Value, Less than 12 months | 25,040
Unrealized Losses, Less than 12 months | (36)
Fair Value, Greater than 12 Months | 0
Unrealized Losses, Greater than 12 Months | 0
Fair Value | 25,040
Unrealized Losses | (36)
Asset-Backed Securities [Member] |
Debt Securities, Available-for-sale [Line Items] |
Fair Value, Less than 12 months | 50,980
Unrealized Losses, Less than 12 months | (317)
Fair Value, Greater than 12 Months | 806
Unrealized Losses, Greater than 12 Months | (10)
Fair Value | 51,786
Unrealized Losses | (327)
Sovereign Bonds [Member] |
Debt Securities, Available-for-sale [Line Items] |
Fair Value, Less than 12 months | 2,119
Unrealized Losses, Less than 12 months | (22)
Fair Value, Greater than 12 Months | 0
Unrealized Losses, Greater than 12 Months | 0
Fair Value | 2,119
Unrealized Losses | (22)
Corporate Bonds [Member] |
Debt Securities, Available-for-sale [Line Items] |
Fair Value, Less than 12 months | 431,652
Unrealized Losses, Less than 12 months | (4,470)
Fair Value, Greater than 12 Months | 3,110
Unrealized Losses, Greater than 12 Months | (33)
Fair Value | 434,762
Unrealized Losses | (4,503)
Agency Bonds [Member] |
Debt Securities, Available-for-sale [Line Items] |
Fair Value, Less than 12 months | 16,077
Unrealized Losses, Less than 12 months | (51)
Fair Value, Greater than 12 Months | 0
Unrealized Losses, Greater than 12 Months | 0
Fair Value | 16,077
Unrealized Losses | (51)
Municipal Bonds [Member] |
Debt Securities, Available-for-sale [Line Items] |
Fair Value, Less than 12 months | 0
Unrealized Losses, Less than 12 months | 0
Fair Value, Greater than 12 Months | 3,892
Unrealized Losses, Greater than 12 Months | (32)
Fair Value | 3,892
Unrealized Losses | $ (32)

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