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Income Taxes - Additional Information (Detail) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Income Taxes [Line Items] |  |  |
Stock-based compensation expense | $ 1,151,199 | $ 1,190,697 | $ 1,102,617
Tax benefit recognized | 285,068 | 219,626 | 244,746
Windfall or shortfall tax impacts | 452,000 | 274,000 | 21,000
Federal | Minimum |  |  |
Income Taxes [Line Items] |  |  |
Tax years subject to examination | 2009 |  |
Federal | Maximum |  |  |
Income Taxes [Line Items] |  |  |
Tax years subject to examination | 2012 |  |
State | Minimum |  |  |
Income Taxes [Line Items] |  |  |
Tax years subject to examination | 2009 |  |
State | Maximum |  |  |
Income Taxes [Line Items] |  |  |
Tax years subject to examination | 2012 |  |
Italy |  |  |
Income Taxes [Line Items] |  |  |
Net operating losses | 9,144,154 |  |
Italy | Minimum |  |  |
Income Taxes [Line Items] |  |  |
Tax years subject to examination | 2009 |  |
Italy | Maximum |  |  |
Income Taxes [Line Items] |  |  |
Tax years subject to examination | 2012 |  |
Massachusetts |  |  |
Income Taxes [Line Items] |  |  |
Investment tax credit carry-forward | $ 298,769 |  |
Massachusetts | Maximum |  |  |
Income Taxes [Line Items] |  |  |
Investment tax credit carry-forward, expiration period | 2021 |  |

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- Definition Tax year that remains open to examination under enacted tax laws, in CCYY format. + 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 (e) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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