Annual report pursuant to Section 13 and 15(d)

Income Taxes - Summary of Reconciliation of U.S. Statutory Rate to Company's Effective Tax Rate (Detail)

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Income Taxes - Summary of Reconciliation of U.S. Statutory Rate to Company's Effective Tax Rate (Detail)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]    
Federal income tax rate 34.00% 34.00%
Foreign rate differential (2.10%) (4.30%)
State tax, net of federal benefit 3.10%  
Permanent Items: Non-deductible expenses (1.70%) (4.50%)
Deferred adjustments 2.90%  
Loss of German NOL's (66.00%) (74.20%)
Withholding tax (1.50%)  
Other   0.10%
Change in valuation allowance 29.80% 48.90%
Effective income tax rate (1.50%) 0.00%