8. STOCK- BASED COMPENSATION - Stock options activities (Details)	9 Months Ended
	Dec. 31, 2016 USD ($) $ / shares shares
STOCK- BASED COMPENSATION
Shares available for future award that were transferred to 2016 Plan	6,000,000
Shares available for grant, Beginning	6,432,063
Options reserved (in shares)	1,085,818
Terminated plan (in shares)	(705,699)
Granted (in shares)	(1,125,188)
Forfeited (in shares)	14,801
Shares available for grant, Ending	5,701,795
Number of Shares Underlying Options Outstanding
Balance at the beginning of the period (in shares)	7,625,705
Granted (in shares)	1,125,188
Exercised (in shares)	(138,683)
Forfeited (in shares)	(962,634)
Balance at the end of the period (in shares)	7,649,576
Options vested and exercisable (in shares)	4,714,337
Options vested and expected to vest (in shares)	7,595,022
Weighted Average Remaining Contractual Life
Options vested and exercisable	4 years 18 days
Options vested and expected to vest	5 years 8 months 27 days
Weighted Average Exercise Price
Balance at the beginning of the period (in dollars per share) | $ / shares	$ 5.08
Granted (in dollars per share) | $ / shares	4.92
Exercised (in dollars per share) | $ / shares	3.63
Forfeited (in dollars per share) | $ / shares	5.54
Balance at the end of the period (in dollars per share) | $ / shares	5.02
Options vested and exercisable (in dollars per share) | $ / shares	4.98
Options vested and expected to vest (in dollars per share) | $ / shares	$ 5.02
Intrinsic Value
Exercised (in dollars) | $	$ 181,058
Options vested and exercisable (in dollars) | $	6,623,354
Options vested and expected to vest (in dollars) | $	$ 9,967,662