(8) Stockholders' Equity (Detail) - (Table 1) (USD $)	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Disclosure Of Compensation Related Costs, Share-Based Payments [Abstract]
Weighted average exercise price, Balance (in dollars per share)	$ 0.56	$ 0.60
Weighted average exercise price, Granted (in dollars per share)
Weighted average exercise price, Exercised (in dollars per share)	$ 0.43
Weighted average exercise price, Canceled (in dollars per share)	$ 0.43	$ 2.08
Weighted average exercise price, Balance (vested and expected to vest) (in dollars per share)	$ 0.49	$ 0.56	$ 0.60
Weighted average exercise price, Exercisable at March 31, 2013 (in dollars per share)	$ 0.54
Number of options, Balance	2,814,302	3,048,677
Number of options, Granted
Number of options, Exercised	(144,437)
Number of options, Canceled	(144,437)	(234,375)
Number of options, Balance (vested and expected to vest)	2,525,428	2,814,302	3,048,677
Number of options, Exercisable at March 31, 2013	1,297,716
Weighted average remaining contractual term, Balance (vested and expected to vest)	7 years 18 days	8 years 22 days	8 years 6 months 18 days
Weighted average remaining contractual term, Exercisable at March 31, 2013	7 years 1 month 28 days
Aggregate intrinsic value, Balance (in dollars)	$ 1,328,393	$ 701,196
Aggregate intrinsic value, Balance (vested and expected to vest) (in dollars)	2,171,868	1,328,393	701,196
Aggregate intrinsic value, Exercisable at March 31, 2013 (in dollars)	$ 1,051,150