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Stock Option Activity (Detail) - $ / shares
 3 Months Ended 12 Months Ended
Jun. 30, 2017
Mar. 31, 2017
Shares    
Beginning balance 1,165,350  
Granted 80,000  
Exercised 0  
Cancelled/expired (32,222)  
Ending balance 1,213,128 1,165,350
Vested and exercisable 1,041,257  
Weighted Average Per Share Exercise Price    
Beginning balance $ 4.24  
Granted 9.71  
Exercised 0  
Cancelled/expired 9.71  
Ending balance 4.42 $ 4.24
Vested and exercisable $ 4.04  
Weighted Average Remaining Life (Years)    
Balance 6 years 7 months 10 days 6 years 7 months 20 days
Granted 0 years  
Exercised 0 years  
Cancelled/expired 0 years  
Vested and exercisable 6 years 2 months 5 days  
Weighted Average Per Share Intrinsic Value    
Beginning Balance $ 4.86  
Granted 0  
Exercised 0  
Cancelled/expired 0  
Ending balance 5.57 $ 4.86
Vested and exercisable $ 5.96