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Income Taxes - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Taxes [Line Items] |  |  |  |
U.S. Federal income tax statutory rate | 21.00% | 21.00% | 35.00% |
Additional deferred tax provision |  | $ 2,614 | $ 22,345 |
Gross tax research other tax credit carryforwards |  | 64,983 |  |
Accrued interest on unrecognized tax benefits |  | 527 | 568 | $ 327
Gross unrecognized tax benefits excluding interest and penalties | $ 43,493 | 32,684 | 27,345 | $ 25,465
Net unrecognized tax benefits, excluding interest and penalties, related to foreign tax positions |  | 1,463 |  |
Change in valuation allowance | 9,424 | 4,307 | $ 1,102 |
Income tax reconciliation nondeductible expense executive compensation | $ 5,023 |  |  |
Benefits Of The Tax Holi day Per Share | $ 0.04 |  |  |
Inland Revenue, Singapore (IRAS) [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Benefits of the tax holiday | $ 2,200 |  |  |
Maximum [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
U.S. Federal income tax statutory rate | 2.80% |  |  |
Indefinite [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Gross tax research other tax credit carryforwards |  | $ 14,230 |  |
Federal State and Foreign [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Tax credit expiration period |  | 2037 |  |
Federal State and Foreign [Member] | Indefinite [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Operating loss carry forwards |  | $ 57,588 |  |
Federal State and Foreign [Member] | 2017 [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Operating loss carry forwards |  | $ 98,280 |  |

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