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Income Taxes - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Maximum
Oct. 29, 2013
Subsequent Event
Dec. 31, 2013
Subsequent Event
Scenario, Forecast
Sep. 30, 2013
Sweden
Dec. 31, 2012
Sweden
Sep. 30, 2013
Available to Reduce Future Federal Income Taxes
Income Taxes [Line Items]                        
Income before income taxes $ 8,142,779     $ 1,790,306 $ 17,798,550 $ 4,853,878            
Income tax provision 2,254,505     (16,183) 5,032,853 250,954            
Expected effective tax rate                 26.60%      
Discrete items recognized   298,000                    
Effective statutory tax rate                   22.00% 26.30%  
Effective tax rate       5.17%   5.17%            
Net operating loss carryforwards                       44,678,000
Business tax credit carryforwards                       2,160,000
Net operating loss and business tax credit carry forwards expiration date             At various dates through December 2032          
Reversed of deferred tax asset valuation allowance     3,021,000                  
Tax years undergoing audit         March 31, 2008 through December 31, 2011              
Total exposure, including penalties, for tax assessment               $ 2,500,000