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Reconciliation of Federal Statutory Corporate Income Tax Rate to Effective Income Tax Rate (Detail)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Reconciliation of Provision of Income Taxes [Line Items]      
Statutory federal income tax rate (35.00%) (35.00%) (35.00%)
State income tax rate, net of federal benefit (2.00%) (4.00%) (4.00%)
Revaluation of warrant liability   3.00% 13.00%
Other permanent differences   (1.00%)  
Foreign rate differential 9.00% 6.00%  
Change in valuation allowance 28.00% 31.00% 26.00%
Effective tax rate