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EQUITY COMPENSATION PLANS AND SHARE-BASED COMPENSATION (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Oct. 26, 2016
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Mar. 31, 2017
Oct. 22, 2014
Net impact of share-based compensation on [Abstract]              
Capitalized share-based compensation costs       $ 200   $ 200  
Excess Tax Benefits (ASU 2016-09) [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]              
Income tax benefit   $ (100)   (200)      
Restricted Stock Units (RSUs) [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]              
Share-based compensation expense before income taxes   3,508 $ 3,066 6,619 $ 5,885    
Income tax benefit   (1,203) (1,058) (2,277) (2,042)    
Total share-based compensation expense after income taxes   $ 2,305 $ 2,008 $ 4,342 $ 3,843    
Net impact of share-based compensation on [Abstract]              
Basic net income per share (in dollars per share)   $ 0.10 $ 0.09 $ 0.19 $ 0.17    
Diluted net income per share (in dollars per share)   $ 0.10 $ 0.09 $ 0.19 $ 0.17    
Restricted Stock Units (RSUs) [Member] | Cost of Revenues [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]              
Share-based compensation expense before income taxes   $ 384 $ 487 $ 751 $ 966    
Restricted Stock Units (RSUs) [Member] | Research and Development [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]              
Share-based compensation expense before income taxes   782 684 1,543 1,278    
Restricted Stock Units (RSUs) [Member] | Sales and Marketing [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]              
Share-based compensation expense before income taxes   1,088 717 2,332 1,421    
Restricted Stock Units (RSUs) [Member] | General and Administrative [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]              
Share-based compensation expense before income taxes   $ 1,254 $ 1,178 $ 1,993 $ 2,220    
2014 Equity Incentive Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]              
Total number of shares of the Company's common stock available for issuance (in shares)             1,712,409
Number of additional shares authorized for issuance under an established share-based compensation plan (in shares) 900,000            
Maximum shares authorized for issuance (in shares)   2,612,409   2,612,409      
Shares available for future issuance (in shares)   989,000   989,000