Quarterly report pursuant to Section 13 or 15(d)

Investments in Marketable Debt Securities, Available-for-Sale - Schedule of Amortized Cost and Fair Value of Marketable Securities, Available-for-Sale, by Type of Security (Detail)

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Investments in Marketable Debt Securities, Available-for-Sale - Schedule of Amortized Cost and Fair Value of Marketable Securities, Available-for-Sale, by Type of Security (Detail) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Marketable Securities [Line Items]    
Amortized Cost $ 191,765 $ 327,501
Fair Value 187,223 322,029
Short-term investments:    
Marketable Securities [Line Items]    
Amortized Cost 116,989 254,682
Allowance for Credit Losses 0 0
Gross Unrealized Gains 0 15
Gross Unrealized Losses (276) (1,263)
Fair Value 116,713 253,434
Long-term investments:    
Marketable Securities [Line Items]    
Amortized Cost 74,776 72,819
Allowance for Credit Losses 0 0
Gross Unrealized Gains 0 21
Gross Unrealized Losses (4,266) (4,245)
Fair Value 70,510 68,595
U.S. treasuries | Short-term investments:    
Marketable Securities [Line Items]    
Amortized Cost 52,455 135,688
Allowance for Credit Losses 0 0
Gross Unrealized Gains 0 14
Gross Unrealized Losses (201) (1,153)
Fair Value 52,254 134,549
U.S. treasuries | Long-term investments:    
Marketable Securities [Line Items]    
Amortized Cost 18,152 21,434
Allowance for Credit Losses 0 0
Gross Unrealized Gains 0 0
Gross Unrealized Losses (651) (719)
Fair Value 17,501 20,715
U.S. government sponsored entities | Long-term investments:    
Marketable Securities [Line Items]    
Amortized Cost 562 602
Allowance for Credit Losses 0 0
Gross Unrealized Gains 0 0
Gross Unrealized Losses (88) (66)
Fair Value 474 536
Corporate debt | Short-term investments:    
Marketable Securities [Line Items]    
Amortized Cost 64,534 118,135
Allowance for Credit Losses 0 0
Gross Unrealized Gains 0 1
Gross Unrealized Losses (75) (95)
Fair Value 64,459 118,041
Corporate debt | Long-term investments:    
Marketable Securities [Line Items]    
Amortized Cost 44,018 44,214
Allowance for Credit Losses 0 0
Gross Unrealized Gains 0 21
Gross Unrealized Losses (2,911) (2,877)
Fair Value 41,107 41,358
Asset-backed securities (“ABS”) and other | Short-term investments:    
Marketable Securities [Line Items]    
Amortized Cost   859
Allowance for Credit Losses   0
Gross Unrealized Gains   0
Gross Unrealized Losses   (15)
Fair Value   844
Asset-backed securities (“ABS”) and other | Long-term investments:    
Marketable Securities [Line Items]    
Amortized Cost 12,044 6,569
Allowance for Credit Losses 0 0
Gross Unrealized Gains 0 0
Gross Unrealized Losses (616) (583)
Fair Value $ 11,428 $ 5,986