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8. STOCK- BASED COMPENSATION - Options outstanding by exercise price (Details) - $ / shares
 9 Months Ended
Dec. 31, 2016
Mar. 31, 2016
Options outstanding by exercise price    
Exercise Price (in dollars per share) $ 5.02 $ 5.08
Number of Shares Underlying Options Outstanding (in shares) 7,649,576  
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 5.02  
Options Outstanding, Weighted Average Remaining Contractual Life 5 years 9 months 7 days  
Options Exercisable, Number Vested and Exercisable (in shares) 4,714,337  
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 4.98  
$2.43 - $3.40    
Options outstanding by exercise price    
Exercise Price, low end of range (in dollars per share) 2.43  
Exercise Price, high end of range (in dollars per share) $ 3.40  
Number of Shares Underlying Options Outstanding (in shares) 849,904  
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 3.17  
Options Outstanding, Weighted Average Remaining Contractual Life 4 years 5 months 9 days  
Options Exercisable, Number Vested and Exercisable (in shares) 618,296  
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 3.09  
$3.43 - $4.00    
Options outstanding by exercise price    
Exercise Price, low end of range (in dollars per share) 3.43  
Exercise Price, high end of range (in dollars per share) $ 4.00  
Number of Shares Underlying Options Outstanding (in shares) 1,216,534  
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 3.80  
Options Outstanding, Weighted Average Remaining Contractual Life 3 years 3 months  
Options Exercisable, Number Vested and Exercisable (in shares) 1,055,944  
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 3.83  
$4.17 - $4.81    
Options outstanding by exercise price    
Exercise Price, low end of range (in dollars per share) 4.17  
Exercise Price, high end of range (in dollars per share) $ 4.81  
Number of Shares Underlying Options Outstanding (in shares) 910,620  
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 4.41  
Options Outstanding, Weighted Average Remaining Contractual Life 4 years 11 months 23 days  
Options Exercisable, Number Vested and Exercisable (in shares) 820,370  
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 4.40  
$4.90 - $4.98    
Options outstanding by exercise price    
Exercise Price, low end of range (in dollars per share) 4.90  
Exercise Price, high end of range (in dollars per share) $ 4.98  
Number of Shares Underlying Options Outstanding (in shares) 777,463  
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 4.95  
Options Outstanding, Weighted Average Remaining Contractual Life 7 years 3 months  
Options Exercisable, Number Vested and Exercisable (in shares) 310,603  
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 4.91  
$4.99 - $5.23    
Options outstanding by exercise price    
Exercise Price, low end of range (in dollars per share) 4.99  
Exercise Price, high end of range (in dollars per share) $ 5.23  
Number of Shares Underlying Options Outstanding (in shares) 1,241,316  
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 5.09  
Options Outstanding, Weighted Average Remaining Contractual Life 8 years 8 months 12 days  
Options Exercisable, Number Vested and Exercisable (in shares) 99,960  
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 5.19  
$5.28 - $5.76    
Options outstanding by exercise price    
Exercise Price, low end of range (in dollars per share) 5.28  
Exercise Price, high end of range (in dollars per share) $ 5.76  
Number of Shares Underlying Options Outstanding (in shares) 819,305  
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 5.55  
Options Outstanding, Weighted Average Remaining Contractual Life 7 years 5 months 1 day  
Options Exercisable, Number Vested and Exercisable (in shares) 311,727  
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 5.62  
$6.00 - $6.54    
Options outstanding by exercise price    
Exercise Price, low end of range (in dollars per share) 6.00  
Exercise Price, high end of range (in dollars per share) $ 6.54  
Number of Shares Underlying Options Outstanding (in shares) 863,008  
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 6.32  
Options Outstanding, Weighted Average Remaining Contractual Life 4 years 9 months 29 days  
Options Exercisable, Number Vested and Exercisable (in shares) 798,008  
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 6.32  
$6.61 - $6.86    
Options outstanding by exercise price    
Exercise Price (in dollars per share) 6.61  
Exercise Price, high end of range (in dollars per share) $ 6.86  
Number of Shares Underlying Options Outstanding (in shares) 651,853  
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 6.77  
Options Outstanding, Weighted Average Remaining Contractual Life 6 years 22 days  
Options Exercisable, Number Vested and Exercisable (in shares) 379,856  
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 6.74  
$7.00    
Options outstanding by exercise price    
Exercise Price (in dollars per share) $ 7.00  
Number of Shares Underlying Options Outstanding (in shares) 206,193  
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 7.00  
Options Outstanding, Weighted Average Remaining Contractual Life 3 years 7 months 2 days  
Options Exercisable, Number Vested and Exercisable (in shares) 206,193  
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 7.00  
$9.20    
Options outstanding by exercise price    
Exercise Price (in dollars per share) $ 9.20  
Number of Shares Underlying Options Outstanding (in shares) 113,380  
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 9.20  
Options Outstanding, Weighted Average Remaining Contractual Life 4 years 29 days  
Options Exercisable, Number Vested and Exercisable (in shares) 113,380  
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 9.20