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Anti-dilutive Security not Included In Diluted per Share Calculations (Detail) - shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti dilutive securities 3,346,332 293,796
Options To Purchase Common Stock    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti dilutive securities 821,741 140,990
Convertible Preferred Stock    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti dilutive securities 736,000  
Common Stock Warrants    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti dilutive securities 1,751,708 12,063
Redeemable Convertible Notes    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti dilutive securities 36,883 140,743