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
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Stock Options [Member]    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Anti-dilutive stock based compensation awards 198,004 267,004
Stock Warrants [Member]    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Anti-dilutive stock based compensation awards 1,600,000 1,200,000