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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 |  |  |  |

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- Definition Amount of other deferred income tax expense (benefit) pertaining to income (loss) from continuing operations. For example, but not limited to, acquisition-date income tax benefits or expenses recognized from changes in the acquirer's valuation allowance for its previously existing deferred tax assets resulting from a business combination and adjustments to beginning-of-year balance of a valuation allowance because of a change in circumstance causing a change in judgment about the realizability of the related deferred tax asset in future periods. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section I -Subsection 7 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6510177 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (g),(h) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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- Definition Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Estimated amount of loss resulting from an adverse tax position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(3) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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