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Short-Term and Long-Term Investments - Summary of Investment (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Cash and Cash Equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Debt Securities, Available-for-sale | $ 178,663 | $ 161,742
Short-term Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Debt Securities, Available-for-sale | 50,217 | 50,166
Other Long-term Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Debt Securities, Available-for-sale | 2,598 | 2,517
Estimate of Fair Value Measurement [Member] | Cash and Cash Equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Debt Securities, Available-for-sale | 89,254 | 89,491
Estimate of Fair Value Measurement [Member] | Short-term Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Debt Securities, Available-for-sale | 50,217 | 50,166
Estimate of Fair Value Measurement [Member] | Other Long-term Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Debt Securities, Available-for-sale | 2,598 | 2,517
Estimate of Fair Value Measurement [Member] | Auction Rate Securities [Member] | Other Long-term Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Debt Securities, Available-for-sale | 2,598 | 2,517
Estimate of Fair Value Measurement [Member] | Money Market Funds [Member] | Cash and Cash Equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Debt Securities, Available-for-sale | 89,254 | 69,493
Estimate of Fair Value Measurement [Member] | US Treasury Obligations [Member] | Cash and Cash Equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Debt Securities, Available-for-sale |  | 19,998
Estimate of Fair Value Measurement [Member] | US Treasury Obligations [Member] | Short-term Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Debt Securities, Available-for-sale | 50,217 | 50,166
Portion at Other than Fair Value Measurement [Member] | Cash [Member] | Cash and Cash Equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Debt Securities, Available-for-sale | $ 89,409 | $ 72,251

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