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Restructuring - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2012
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and impairment charges | $ 2,500,000 | $ 1,604,256
In-process research & development |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and impairment charges | 1,200,000 |
Noncash disposal of property and equipment |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and impairment charges | 300,000 |
Disposal of inventory |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and impairment charges | 100,000 |
Employee termination costs |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and impairment charges | $ 900,000 |

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- Definition Adjustment to remove noncash portion of restructuring costs and impairment charges. + 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FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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