(4) Union Capital Financing (Detail) - (Table 2) (USD $)	6 Months Ended	12 Months Ended
	Sep. 30, 2013	Mar. 31, 2013
Level 1 | Warrants
Fair Value, Assets and Liabilities Measured On Recurring and Nonrecurring Basis [Line Items]
Common stock trading volatility:
Level 1 | Preferred CED
Fair Value, Assets and Liabilities Measured On Recurring and Nonrecurring Basis [Line Items]
Common stock trading market price	$ 1.15	$ 1.35
Level 1 | Preferred CED | Minimum
Fair Value, Assets and Liabilities Measured On Recurring and Nonrecurring Basis [Line Items]
Common stock trading volatility:	33.76%	55.98%
Level 1 | Preferred CED | Maximum
Fair Value, Assets and Liabilities Measured On Recurring and Nonrecurring Basis [Line Items]
Common stock trading volatility:	55.82%	88.87%
Level 2 | Preferred CED | Minimum
Fair Value, Assets and Liabilities Measured On Recurring and Nonrecurring Basis [Line Items]
Credit-risk adjusted yields:	6.10%	6.64%
Level 2 | Preferred CED | Maximum
Fair Value, Assets and Liabilities Measured On Recurring and Nonrecurring Basis [Line Items]
Credit-risk adjusted yields:	7.16%	7.40%
Level 3 | Preferred CED
Fair Value, Assets and Liabilities Measured On Recurring and Nonrecurring Basis [Line Items]
Common stock trading volatility:	45.44%	67.38%
Credit-risk adjusted yields:	6.39%	6.96%
Terms (years):	11 months 4 days	1 year 1 month 6 days