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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Jan. 01, 2017
Income Taxes [Line Items] |  |
Excess tax benefit, amount | $ 3,500 |
Tax Cuts And Jobs Act Of 2017, change in tax rate, deferred tax asset, provisional income tax expense (benefit) | 12,900 |
Valuation allowance, additional | 28,100 |
Accrued interest or penalties related to uncertain tax positions | 10 |
Total amount of unrecognized tax benefits | 97 |
Canada | Research and development |  |
Income Taxes [Line Items] |  |
Tax credit carryforwards | $ 1,700 |
Tax credit carryforward expiration year | 2037 |
Domestic tax authority |  |
Income Taxes [Line Items] |  |
Net operating loss carryforwards | $ 51,400 |
Net operating losses expiration beginning period | 2019 |
Federal net operating losses expiration ending Period | 2037 |
Tax credit carryforwards | $ 10,000 |
Federal credit carryforward expiration, beginning period | 2018 |
Federal credit carryforward expiration ending Period | 2037 |
State and local jurisdiction |  |
Income Taxes [Line Items] |  |
Net operating loss carryforwards | $ 53,200 |
Net operating losses expiration beginning period | 2028 |
Tax credit carryforwards | $ 2,100 |
Foreign tax authority | Ireland |  |
Income Taxes [Line Items] |  |
Net operating loss carryforwards | $ 3,200 |
Accounting Standards Update 2016-16 | Accumulated Deficit |  |
Income Taxes [Line Items] |  |
Cumulative effect of new accounting principle in period of adoption |  | $ (7,000)

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