7. STOCK- BASED COMPENSATION (Details 4)	3 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Employee Consultants And Directors Stock Options
Stock-based compensation
Risk-free interest rate (as a percent)	1.66%	0.91%
Expected life	5 years	5 years
Volatility (as a percent)	44.52%	48.40%
Dividend yield (as a percent)	0.00%	0.00%
Employee stock purchase plan
Stock-based compensation
Risk-free interest rate (as a percent)	0.05%	0.09%
Expected life	6 months	6 months
Volatility (as a percent)	30.80%	30.40%
Dividend yield (as a percent)	0.00%	0.00%