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Warrants (Detail)
3 Months Ended
Mar. 31, 2019
$ / shares
shares
Warrant Exercise Price Range One 9.00  
Class of Warrant or Right [Line Items]  
Warrants outstanding 1,075,492
Weighted average remaining contractual life 1 year 6 months 14 days
Warrants exercisable 1,075,492
Weighted average exercise price per share | $ / shares $ 9.00
Warrant Exercise Price Range Two 10.00  
Class of Warrant or Right [Line Items]  
Warrants outstanding 1,416,085
Weighted average remaining contractual life 3 years 14 days
Warrants exercisable 1,416,085
Weighted average exercise price per share | $ / shares $ 10.00
Warrant Exercise Price Range Three 11.00  
Class of Warrant or Right [Line Items]  
Warrants outstanding 828,902
Weighted average remaining contractual life 3 years 8 months 8 days
Warrants exercisable 828,902
Weighted average exercise price per share | $ / shares $ 11.00
Warrant Exercise Price Range Four 9.00 - 10.00  
Class of Warrant or Right [Line Items]  
Warrants outstanding 3,320,479
Weighted average remaining contractual life 2 years 8 months 19 days
Warrants exercisable 3,320,479
Weighted average exercise price per share | $ / shares $ 9.93