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Recent Accounting Standards - Additional Information (Detail) - USD ($) | Sep. 30, 2020 | Jan. 01, 2020 | Dec. 31, 2019
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New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Retained earnings | $ 573,304,000 |  | $ 583,489,000
Short-term investments | $ 0 |  | $ 108,919,000
Minimum | US Treasury Securities |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Available-for-sale securities maturity range | 3 months |  |
Maximum | US Treasury Securities |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Available-for-sale securities maturity range | 1 year |  |
ASU 2016-13 | Revision Of Prior Period Change In Accounting Principle Adjustment |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Retained earnings |  | $ 0 |
ASU 2018-15 |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Material capitalized implementation costs | $ 0 |  |

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