Revenue by Product Group, by Significant Customer and by Geographic Region Geographic Information - Additional Information (Detail) (USD $)
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12 Months Ended | ||
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Segment Reporting Information [Line Items] | |||
Licensing, milestone and contract revenue | $ 3,348,336 | $ 2,822,249 | $ 2,820,864 |