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Warrants (Detail)
3 Months Ended
Jun. 30, 2017
$ / shares
shares
Warrant Exercise Price Range One 4.00 - 5.00  
Class of Warrant or Right [Line Items]  
Warrants outstanding | shares 188,500
Weighted average remaining contractual life 7 months 6 days
Warrants exercisable | shares 188,500
Weighted average exercise price per share $ 4.47
Warrant Exercise Price Range One 4.00 - 5.00 | Maximum [Member]  
Class of Warrant or Right [Line Items]  
Exercise Price Per Share 5.00
Warrant Exercise Price Range One 4.00 - 5.00 | Minimum [Member]  
Class of Warrant or Right [Line Items]  
Exercise Price Per Share $ 4.00
Warrant Exercise Price Range Two 9.00 - 10.00  
Class of Warrant or Right [Line Items]  
Warrants outstanding | shares 1,781,666
Weighted average remaining contractual life 3 years 3 months 18 days
Warrants exercisable | shares 1,781,666
Weighted average exercise price per share $ 9.37
Warrant Exercise Price Range Two 9.00 - 10.00 | Maximum [Member]  
Class of Warrant or Right [Line Items]  
Exercise Price Per Share 10.00
Warrant Exercise Price Range Two 9.00 - 10.00 | Minimum [Member]  
Class of Warrant or Right [Line Items]  
Exercise Price Per Share $ 9.00
Warrant Exercise Price Range Three 4.00 - 10.00  
Class of Warrant or Right [Line Items]  
Warrants outstanding | shares 1,970,166
Weighted average remaining contractual life 3 years 11 days
Warrants exercisable | shares 1,970,166
Weighted average exercise price per share $ 8.90
Warrant Exercise Price Range Three 4.00 - 10.00 | Maximum [Member]  
Class of Warrant or Right [Line Items]  
Exercise Price Per Share 10.00
Warrant Exercise Price Range Three 4.00 - 10.00 | Minimum [Member]  
Class of Warrant or Right [Line Items]  
Exercise Price Per Share $ 4.00