7. STOCK- BASED COMPENSATION (Details)	9 Months Ended
	Dec. 31, 2015 USD ($) $ / shares shares
Stock-Based Compensation
Shares available for grant, Beginning	6,213,943
Options reserved (in shares)	1,156,419
Granted (in shares)	(661,103)
Forfeited/expired (in shares)	9,864
Shares available for grant, Ending	6,719,123
Number of Shares Underlying Options Outstanding
Balance at the beginning of the period (in shares)	6,774,151
Granted (in shares)	661,103
Exercised (in shares)	(76,745)
Forfeited (in shares)	(19,864)
Balance at the end of the period (in shares)	7,338,645
Options vested and exercisable (in shares)	4,976,550
Options vested and expected to vest (in shares)	7,290,669
Weighted Average Remaining Contractual Life
Options vested and exercisable (in dollars per share)	3 years 9 months 26 days
Options vested and expected to vest (in dollars per share)	5 years 2 months 19 days
Weighted Average Exercise Price
Balance at the beginning of the period (in dollars per share) | $ / shares	$ 5.16
Granted (in dollars per share) | $ / shares	4.90
Exercised (in dollars per share) | $ / shares	4.19
Forfeited (in dollars per share) | $ / shares	4.64
Balance at the end of the period (in dollars per share) | $ / shares	5.15
Options vested and exercisable (in dollars per share) | $ / shares	5.05
Options vested and expected to vest (in dollars per share) | $ / shares	$ 5.14
Intrinsic Value
Exercised (in dollars) | $	$ 46,977
Options vested and exercisable (in dollars) | $	484,583
Options vested and expected to vest (in dollars) | $	$ 484,583