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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, 2013
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Jun. 30, 2012
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Jun. 30, 2013
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Jun. 30, 2012
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| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||||
| Total of weighted average shares outstanding | 5,185,964 | 3,366,616 | 5,179,186 | 3,217,216 |
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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 | 1,066,156 | 1,042,216 | 1,126,815 | 1,055,509 |
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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 | 4,119,808 | 2,324,400 | 4,052,371 | 2,161,707 |