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Cash, Cash Equivalents and Investments - Amortized Cost to Fair Value (Detail) $ in Thousands | Dec. 31, 2021 USD ($)
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Debt Securities, Available-for-sale [Line Items] |
Amortized Cost | $ 725,105
Gross Unrealized Gains | 1,069
Gross Unrealized Losses | (4,971)
Fair Value, Total | 721,203
Treasury Bills [Member] |
Debt Securities, Available-for-sale [Line Items] |
Fair Value, Total | 58,665
Treasury Bills [Member] | Short-term Investments [Member] |
Debt Securities, Available-for-sale [Line Items] |
Amortized Cost | 18,864
Gross Unrealized Gains | 51
Gross Unrealized Losses | (3)
Fair Value, Total | 18,912
Treasury Bills [Member] | Long-term investments [Member] |
Debt Securities, Available-for-sale [Line Items] |
Amortized Cost | 39,740
Gross Unrealized Gains | 46
Gross Unrealized Losses | (33)
Fair Value, Total | 39,753
Asset-Backed Securities [Member] |
Debt Securities, Available-for-sale [Line Items] |
Fair Value, Total | 81,595
Asset-Backed Securities [Member] | Short-term Investments [Member] |
Debt Securities, Available-for-sale [Line Items] |
Amortized Cost | 37,568
Gross Unrealized Gains | 112
Gross Unrealized Losses | (25)
Fair Value, Total | 37,655
Asset-Backed Securities [Member] | Long-term investments [Member] |
Debt Securities, Available-for-sale [Line Items] |
Amortized Cost | 44,197
Gross Unrealized Gains | 45
Gross Unrealized Losses | (302)
Fair Value, Total | 43,940
Corporate Bonds [Member] |
Debt Securities, Available-for-sale [Line Items] |
Fair Value, Total | 554,306
Corporate Bonds [Member] | Short-term Investments [Member] |
Debt Securities, Available-for-sale [Line Items] |
Amortized Cost | 72,863
Gross Unrealized Gains | 251
Gross Unrealized Losses | (26)
Fair Value, Total | 73,088
Corporate Bonds [Member] | Long-term investments [Member] |
Debt Securities, Available-for-sale [Line Items] |
Amortized Cost | 485,140
Gross Unrealized Gains | 555
Gross Unrealized Losses | (4,477)
Fair Value, Total | 481,218
Sovereign Bonds [Member] |
Debt Securities, Available-for-sale [Line Items] |
Fair Value, Total | 2,119
Sovereign Bonds [Member] | Long-term investments [Member] |
Debt Securities, Available-for-sale [Line Items] |
Amortized Cost | 2,141
Gross Unrealized Gains | 0
Gross Unrealized Losses | (22)
Fair Value, Total | 2,119
Municipal Bonds [Member] |
Debt Securities, Available-for-sale [Line Items] |
Fair Value, Total | 5,639
Municipal Bonds [Member] | Short-term Investments [Member] |
Debt Securities, Available-for-sale [Line Items] |
Amortized Cost | 5,029
Gross Unrealized Gains | 1
Gross Unrealized Losses | (32)
Fair Value, Total | 4,998
Municipal Bonds [Member] | Long-term investments [Member] |
Debt Securities, Available-for-sale [Line Items] |
Amortized Cost | 635
Gross Unrealized Gains | 6
Gross Unrealized Losses | 0
Fair Value, Total | 641
Agency Bonds [Member] |
Debt Securities, Available-for-sale [Line Items] |
Fair Value, Total | 18,879
Agency Bonds [Member] | Short-term Investments [Member] |
Debt Securities, Available-for-sale [Line Items] |
Amortized Cost | 2,800
Gross Unrealized Gains | 2
Gross Unrealized Losses | 0
Fair Value, Total | 2,802
Agency Bonds [Member] | Long-term investments [Member] |
Debt Securities, Available-for-sale [Line Items] |
Amortized Cost | 16,128
Gross Unrealized Gains | 0
Gross Unrealized Losses | (51)
Fair Value, Total | $ 16,077

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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