Net Loss Per Common Share - Computations of Diluted Weighted Average Shares Outstanding (Detail)
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3 Months Ended | |
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Mar. 31, 2014
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Mar. 31, 2013
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Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||
Total of weighted average shares outstanding | 8,305,219 | 5,172,331 |
Unvested Restricted Stock [Member]
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Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||
Total of weighted average shares outstanding | 5,009,512 | 0 |
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 | 711,895 | 1,188,147 |
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 | 2,583,812 | 3,984,184 |