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Net Loss Per Common Share - Computations of Diluted Weighted Average Shares Outstanding (Detail)
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3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
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Jun. 30, 2014
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Jun. 30, 2013
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Jun. 30, 2014
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Jun. 30, 2013
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| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||||
| Total of weighted average shares outstanding | 9,188,360 | 5,185,964 | 8,749,229 | 5,179,186 |
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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 | 6,308,368 | 0 | 5,662,528 | 0 |
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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 | 692,916 | 1,066,156 | 702,353 | 1,126,815 |
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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 | 2,187,076 | 4,119,808 | 2,384,348 | 4,052,371 |