Quarterly report pursuant to Section 13 or 15(d)

Significant Accounting Policies - Summary of Potentially Dilutive Adjustments to Weighted Average Number of Common Shares Excluded from Calculation (Detail)

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Significant Accounting Policies - Summary of Potentially Dilutive Adjustments to Weighted Average Number of Common Shares Excluded from Calculation (Detail)
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Securities excluded from calculation (in shares) 3,099,253 2,349,876 3,099,253 2,349,876
Common Stock Purchase Warrants [Member]
        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Securities excluded from calculation (in shares) 1,531,696 1,843,582 1,531,696 1,843,582
Stock Options [Member]
        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Securities excluded from calculation (in shares) 1,461,724 506,294 1,461,724 506,294
Restricted Shares of Common Stock [Member]
        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Securities excluded from calculation (in shares) 105,833 0 105,833 0