Quarterly report pursuant to Section 13 or 15(d)

Warrants (Detail)

v3.8.0.1
Warrants (Detail)
 3 Months Ended
Mar. 31, 2018
$ / shares
shares
Class of Warrant or Right [Line Items]  
Weighted average remaining contractual life 0 years
Warrant Exercise Price Range One 4.50  
Class of Warrant or Right [Line Items]  
Warrants outstanding 24,000
Weighted average remaining contractual life 7 months 6 days
Warrants exercisable 24,000
Weighted average exercise price per share | $ / shares $ 4.50
Warrant Exercise Price Range Two 9.00  
Class of Warrant or Right [Line Items]  
Warrants outstanding 1,116,111
Weighted average remaining contractual life 2 years 6 months 11 days
Warrants exercisable 1,116,111
Weighted average exercise price per share | $ / shares $ 9.00
Warrant Exercise Price Range Three 10.00  
Class of Warrant or Right [Line Items]  
Warrants outstanding 1,455,555
Weighted average remaining contractual life 4 years 18 days
Warrants exercisable 1,455,555
Weighted average exercise price per share | $ / shares $ 10.00
Warrant Exercise Price Range Four 11.00  
Class of Warrant or Right [Line Items]  
Warrants outstanding 850,000
Weighted average remaining contractual life 4 years 8 months 8 days
Warrants exercisable 850,000
Weighted average exercise price per share | $ / shares $ 11.00
Warrant Exercise Price Range Five 4.50-11.00  
Class of Warrant or Right [Line Items]  
Warrants outstanding 3,445,666
Weighted average remaining contractual life 3 years 8 months 8 days
Warrants exercisable 3,445,666
Weighted average exercise price per share | $ / shares $ 9.88