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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
Mar. 31, 2017
Mar. 31, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Average market price during the period $ 4.22 $ 3.63
Potential common shares excluded from EPS 309,922 505,489
Stock Options [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potential common shares excluded from EPS 7,903  
Warrant Derivatives [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potential common shares excluded from EPS 19,905