Federal Income Tax Provision Compared With Statutory Rates (Detail)	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Components Of Income Tax Expense Benefit [Line Items]
Statutory regular federal income tax rate	(34.00%)	(34.00%)	(34.00%)
Change in valuation allowance	27.00%	(13.00%)	(2.30%)
Tax return to prior year provision adjustments	(0.90%)	16.20%	2.00%
Expiration of federal net operating losses		28.20%	20.20%
Reduction of net operating loss attributes	(3.10%)	(3.70%)	(2.30%)
State tax benefit (net of federal benefit)	(4.20%)	4.10%	18.10%
Research credits	(2.10%)		(3.00%)
Foreign amounts with no tax benefit	(0.20%)	(0.60%)	(0.20%)
Non-deductible expenses	1.60%	6.10%	3.80%
Effect of change in rate	14.20%
Other	0.30%	0.50%	(0.30%)
Total	(1.40%)	3.80%	2.00%

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Effective income tax rate reconciliation other reconciling items.

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No definition available.

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- Definition

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to changes in the valuation allowance for deferred tax assets.

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The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit that is attributable to changes in the income tax laws or rates.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to other deductions received under enacted tax laws not otherwise listed in the existing taxonomy.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate that can be explained by the difference between statutory income tax rates in foreign jurisdictions and the domestic federal statutory income tax rate recorded during the period.

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The sum of the differences between the effective income tax rate and domestic federal statutory income tax rate attributable to all nondeductible expenses under enacted tax laws.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to revisions in previously reported amounts of income tax provision.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate that can be explained by the state and local income tax expense or benefit, net of the federal tax benefit (expense) thereon, recorded during the period.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate that can be explained by tax credits, not otherwise listed in the existing taxonomy, generated or utilized under enacted tax laws during the period.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate that can be explained by research tax credits generated or utilized under enacted tax laws during the period.

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