Income Taxes - Additional Information (Detail) (USD $)
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3 Months Ended | 9 Months Ended | 1 Months Ended | 9 Months Ended | 12 Months Ended | |||||||
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Sep. 30, 2013
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Mar. 31, 2013
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Dec. 31, 2012
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Sep. 30, 2012
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Sep. 30, 2013
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Sep. 30, 2012
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Sep. 30, 2013
Maximum
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Oct. 29, 2013
Subsequent Event
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Dec. 31, 2013
Subsequent Event
Scenario, Forecast
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Sep. 30, 2013
Sweden
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Dec. 31, 2012
Sweden
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Sep. 30, 2013
Available to Reduce Future Federal Income Taxes
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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 |