Annual report pursuant to Section 13 and 15(d)

Income Taxes - Principal Differences Between Income Taxes Computed at U.S. Statutory Tax Rate and German Statutory Tax Rate and Respective Effective Tax Rate (Detail)

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Income Taxes - Principal Differences Between Income Taxes Computed at U.S. Statutory Tax Rate and German Statutory Tax Rate and Respective Effective Tax Rate (Detail) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]    
Income tax expense (benefit) at the statutory federal income tax rate $ (3,348,994)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 19,280us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Decrease in allowances on deferred tax assets (4,811,972)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance (37,210)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Differences local / Group tax rate 420,337us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate  
Nondeductible expenses 438,797us-gaap_IncomeTaxReconciliationNondeductibleExpense 17,930us-gaap_IncomeTaxReconciliationNondeductibleExpense
Correction of net operating loss carryforwards 7,307,952us-gaap_IncomeTaxReconciliationPriorYearIncomeTaxes  
Other (6,102)us-gaap_IncomeTaxReconciliationOtherAdjustments  
Total income tax expense (benefit) $ 18us-gaap_IncomeTaxExpenseBenefit