Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Summary of Anti-dilutive Stock Based Compensation Awards (Detail)

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Summary of Significant Accounting Policies - Summary of Anti-dilutive Stock Based Compensation Awards (Detail) - shares
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Stock Options [Member]    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Anti-dilutive stock based compensation awards 19,800 26,700
Stock Warrants [Member]    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Anti-dilutive stock based compensation awards 160,000 120,000