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Summary of Significant Accounting Policies - Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share for in the Money Potential Common Shares (Detail) - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Average market price during the period $ 4.18 $ 3.24 $ 3.99 $ 3.31
Potential common shares excluded from EPS 308,255 502,494 308,255 502,494
Stock Options [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Potential common shares excluded from EPS 7,763 4,474 7,062 4,631
Warrant Derivatives [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Potential common shares excluded from EPS 18,948   14,136