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Effective Income Tax Rate (Detail)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Schedule Of Income Taxes [Line Items]      
Federal tax benefit rate 35.00% 35.00% 35.00%
Permanent items (1.90%)   0.90%
Intercompany transfer of intellectual property 0.90% (1.00%) (4.10%)
Valuation allowance (34.00%) (34.00%) (31.80%)
Effective income tax rate 0.00% 0.00% 0.00%