Annual report pursuant to Section 13 and 15(d)

Federal Income Tax Provision Compared With Statutory Rates (Detail)

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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%