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Income Taxes - Reconciliation between the Benefit (Provision) for Income Taxes at Statutory Rate and Effective Tax Rate (Detail) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Abstract] |  |  |
Federal statutory tax rate | 35.00% | 35.00% | 35.00%
Sale of IP rights to foreign subsidiary | 0.00% | (13.80%) | 22.50%
Benefit from foreign losses | 0.00% | 0.00% | 7.80%
Foreign withholding | (0.20%) | (1.20%) | 0.50%
Stock compensation expense | (2.00%) | (6.60%) | 5.80%
Meals & entertainment | 0.00% | 0.00% | 0.10%
Foreign rate differential | (17.00%) | (1.20%) | (24.00%)
Prior year true-up items | (0.10%) | (0.30%) | 1.70%
Tax reserves | (0.10%) | 1.80% | 3.90%
Loss on foreign share transfer | 0.00% | 0.00% | 5.90%
Credits | 0.40% | 1.60% | (35.50%)
State Refunds | 0.00% | 3.80% | 0.00%
Other | 0.00% | (1.60%) | 3.90%
2017 Tax Act impact - federal rate change | (28.70%) | 0.00% | 0.00%
Valuation allowance | 11.60% | (193.40%) | 8.20%
Effective tax rate | (1.10%) | (175.90%) | 35.80%

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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to Foreign Withholding which can be suitable for both positive as well as negative value. + References No definition available. + Details
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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to Tax Reserves which can be suitable for both positive as well as negative value. + References No definition available. + Details
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