Summary of Restricted Stock Award (Detail) - $ / shares	6 Months Ended	12 Months Ended
	Sep. 30, 2015	Mar. 31, 2015
Schedule Of Share Based Compensation Restricted Stock Units Award Activity [Line Items]
Shares,Balance, Beginning	3,752,004
Shares,Granted	0
Shares,Released	0
Shares,Balance, Ending	3,752,004	3,752,004
Vested and exercisable	3,651,675
Balance, Weighted Average Remaining Vesting Life (Years)	0 years	1 month 6 days
Balance, Weighted Average Remaining Vesting Life, Granted	0 years
Balance, Weighted Average Remaining Vesting Life, Released	0 years
Weighted Average Per Share Intrinsic Value, Balance, Beginning	$ 0.70
Weighted Average Per Share Intrinsic Value, Granted	0
Weighted Average Per Share Intrinsic Value, Released	0
Weighted Average Per Share Intrinsic Value, Balance, Ending	0.70	$ 0.70
Weighted Average Per Share Fair Value, Balance, Beginning	0.07
Weighted Average Per Share Fair Value, Granted	0
Weighted Average Per Share Fair Value, Released	0
Weighted Average Per Share Fair Value, Balance, Ending	$ 0.07	$ 0.07