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Income Taxes - Additional Information (Detail) - USD ($) |  | 12 Months Ended
--- | --- | ---
Dec. 22, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Taxes [Line Items] |  |  |  |  |  |
Increase in valuation allowance |  |  | $ 30,500,000 | $ 12,300,000 |  | $ 22,000,000
Federal and state net operating loss carryforwards |  |  | 71,256,000 | 42,900,000 |  |
Foreign net operating loss carryforwards |  |  | $ 15,052,000 | $ 11,704,000 |  |
Tax at statutory federal rate | 35.00% |  | 34.00% | 34.00% | 34.00% |
Reduction in deferred tax assets |  |  | $ 55,200,000 |  |  |
Percentage of ownership changes |  |  | 0.00% |  |  |
Unrecognized tax benefits |  |  | $ 23,300,000 |  |  |
Unrecognized tax benefits that would affect effective tax rate |  |  | 400,000 |  |  |
Accrued interest, unrecognized tax benefits |  |  | $ 0 | $ 0 |  |
Unrecognized tax benefits description |  |  | The Company does not anticipate a material change to its unrecognized tax benefits over the next twelve months that would affect the Company’s effective tax rate. |  |  |
Earliest Tax Year [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Foreign statute of limitation generally remains open in the year |  |  | 2008 |  |  |
Latest Tax Year [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Foreign statute of limitation generally remains open in the year |  |  | 2017 |  |  |
ASU 2016-09 [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Increase in valuation allowance |  |  | $ 19,500,000 |  |  |
Retrospective increase in deferred tax assets for previously unrecognized excess tax benefits |  |  | 19,500,000 |  |  |
Scenario, Forecast [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Tax at statutory federal rate |  | 21.00% |  |  |  |
Foreign net operating loss [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Foreign net operating loss carryforwards |  |  | $ 63,500,000 |  |  |
Foreign net operating loss [Member] | Minimum [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Operating loss carryforwards expiration year |  |  | 2018 |  |  |
Foreign net operating loss [Member] | Maximum [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Operating loss carryforwards expiration year |  |  | 2027 |  |  |
Federal [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Federal and state net operating loss carryforwards |  |  | $ 306,000,000 |  |  |
Operating loss carryforwards expiration year |  |  | 2026 |  |  |
Other tax credit carryforwards |  |  | $ 38,800,000 |  |  |
Other tax credit carryforwards expiration year |  |  | 2018 |  |  |
State [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Federal and state net operating loss carryforwards |  |  | $ 143,400,000 |  |  |
Operating loss carryforwards expiration year |  |  | 2018 |  |  |
State [Member] | California [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Other tax credit carryforwards |  |  | $ 22,900,000 |  |  |

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