NET LOSS PER SHARE - Schedule of Calculations of Basic and Diluted Net Income (Loss) Per Share and Potential Common Shares (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Numerator:
Net loss	$ (2,468)	$ (1,266)	$ (26,690)	$ (10,264)
Denominator:
Denominator for basic net income (loss) per share - weighted average common shares outstanding (in shares)	88,589	91,919	89,878	92,628
Dilutive common equivalent shares:
Weighted average restricted stock units (in shares)	0	0	0	0
Denominator for diluted net income per share - weighted average shares outstanding (in shares)	88,589	91,919	89,878	92,628
Net loss per share:
Basic net loss per share (in USD per share)	$ (0.03)	$ (0.01)	$ (0.30)	$ (0.11)
Diluted net loss per share (in USD per share)	$ (0.03)	$ (0.01)	$ (0.30)	$ (0.11)