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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Taxes [Line Items] |  |  |
Change in valuation allowance | $ 12,300,000 | $ 22,000,000 | $ 21,600,000
Federal and state net operating loss carryforwards | 42,900,000 | 53,393,000 |
Foreign net operating loss carryforwards | 11,704,000 | 8,421,000 |
Benefit of stock options | $ 19,500,000 |  |
Percentage of ownership changes | 0.00% |  |
Unrecognized tax benefits | $ 19,700,000 |  |
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 | 2007 |  |
Latest Tax Year [Member] |  |  |
Income Taxes [Line Items] |  |  |
Foreign statute of limitation generally remains open in the year | 2016 |  |
Foreign net operating loss [Member] |  |  |
Income Taxes [Line Items] |  |  |
Foreign net operating loss carryforwards | $ 48,300,000 |  |
Foreign net operating loss [Member] | Minimum [Member] |  |  |
Income Taxes [Line Items] |  |  |
Operating loss carryforwards expiration year | 2017 |  |
Foreign net operating loss [Member] | Maximum [Member] |  |  |
Income Taxes [Line Items] |  |  |
Operating loss carryforwards expiration year | 2026 |  |
Federal [Member] |  |  |
Income Taxes [Line Items] |  |  |
Federal and state net operating loss carryforwards | $ 170,100,000 |  |
Operating loss carryforwards expiration year | 2026 |  |
Other tax credit carryforwards | $ 31,500,000 |  |
Other tax credit carryforwards expiration year | 2018 |  |
State [Member] |  |  |
Income Taxes [Line Items] |  |  |
Federal and state net operating loss carryforwards | $ 138,200,000 |  |
Operating loss carryforwards expiration year | 2018 |  |
State [Member] | California [Member] |  |  |
Income Taxes [Line Items] |  |  |
Other tax credit carryforwards | $ 20,800,000 |  |

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