Effective Income Tax Rate (Detail)	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Federal tax benefit rate	21.00%	35.00%	35.00%
Permanent items	1.00%	6.20%	(1.90%)
Intercompany transfer of intellectual property	0.00%	0.00%	0.90%
Tax law changes	(0.70%)	(265.00%)	0.00%
Stock based compensation	(6.50%)	(5.00%)	0.00%
Tax attribute expirations	(1.60%)	(2.80%)	0.00%
Foreign withholding tax	(0.30%)	0.00%	0.00%
Valuation allowance	(13.20%)	231.60%	(34.00%)
Effective income tax rate	(0.30%)	0.00%	0.00%

Effective income tax rate reconciliation effect of tax law changes.

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Effective income tax rate reconciliation expirations of attribute.

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Effective income tax rate reconciliation foreign withholding tax.

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Effective Income Tax Rate Reconciliation Permanent Items

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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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 attributable to changes in the valuation allowance for deferred tax assets.

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