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7. STOCK- BASED COMPENSATION (Details) (USD $)
 3 Months Ended 6 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Stock-Based Compensation        
Shares available for grant, Beginning     5,585,500  
Options reserved (in shares)     1,377,699  
Granted (in shares)     (575,043)  
Forfeited (in shares)     8,200  
Shares available for grant, Ending 6,396,356   6,396,356  
Number of Shares Underlying Options Outstanding        
Balance at the beginning of the period (in shares)     6,143,980  
Granted (in shares)     575,043  
Exercised (in shares)     (105,725)  
Forfeited (in shares)     (8,200)  
Balance at the end of the period (in shares) 6,605,098   6,605,098  
Options vested and exercisable (in shares) 4,188,255   4,188,255  
Options vested and expected to vest (in shares) 6,556,577   6,556,577  
Weighted Average Remaining Contractual Life        
Options vested and exercisable (in dollars per share) 4 years 5 months 12 days      
Options vested and expected to vest (in dollars per share) 5 years 10 months 13 days      
Weighted Average Exercise Price        
Balance at the beginning of the period (in dollars per share)     $ 5.13  
Granted (in dollars per share)     $ 5.29  
Exercised (in dollars per share)     $ 4.04  
Forfeited (in dollars per share)     $ 5.97  
Balance at the end of the period (in dollars per share) $ 5.16   $ 5.16  
Options vested and exercisable (in dollars per share) $ 4.83   $ 4.83  
Options vested and expected to vest (in dollars per share) $ 5.16   $ 5.16  
Intrinsic Value        
Exercised (in dollars)     $ 224,178  
Options vested and exercisable (in dollars) 3,742,830   3,742,830  
Options vested and expected to vest (in dollars) $ 4,300,040   $ 4,300,040  
Weighted average fair value        
Weighted average fair value per underlying share of options granted (in dollars per share) $ 2.14 $ 2.93 $ 2.16 $ 2.72