Net Loss Per Common Share - Computations of Diluted Weighted Average Shares Outstanding (Detail)
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3 Months Ended | 9 Months Ended | ||
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Sep. 30, 2013
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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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Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||||
Total of weighted average shares outstanding | 5,326,424 | 3,459,636 | 5,228,805 | 3,298,612 |
Warrants to Purchase Common Stock [Member]
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Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||||
Total of weighted average shares outstanding | 1,040,921 | 1,090,294 | 1,097,869 | 1,067,187 |
Options to Purchase Common Stock [Member]
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Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||||
Total of weighted average shares outstanding | 4,285,503 | 2,369,342 | 4,130,936 | 2,231,425 |