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Common Stock - Additional Information 2 (Detail) - shares
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Anti-dilutive securities excluded from earning per share computation 1,700,000 0
Warrant [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Anti-dilutive securities excluded from earning per share computation 400,000 0
Stock Options [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Anti-dilutive securities excluded from earning per share computation 1,100,000 0
Restricted Stock Unit [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Anti-dilutive securities excluded from earning per share computation 200,000 0