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Effective Income Tax Rate (Detail)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Schedule Of Income Taxes [Line Items]      
Federal tax benefit rate 35.00% 35.00% 35.00%
State tax benefit, net of federal benefit         
Permanent items         
Intercompany transfer of intellectual property (4.30%) (4.00%) (5.00%)
Valuation allowance (30.70%) (31.00%) (30.00%)
Effective income tax rate 0.00% 0.00% 0.00%