(4) Union Capital Financing (Detail) - (Table 2) (USD $)	3 Months Ended
	Jun. 30, 2013	Mar. 31, 2013
Level 1 | Warrants
Fair Value, Assets and Liabilities Measured On Recurring and Nonrecurring Basis [Line Items]
Our trading volatility:
Level 1 | Preferred CED
Fair Value, Assets and Liabilities Measured On Recurring and Nonrecurring Basis [Line Items]
Our trading market price	$ 1.30	$ 1.35
Level 1 | Preferred CED | Minimum
Fair Value, Assets and Liabilities Measured On Recurring and Nonrecurring Basis [Line Items]
Our trading volatility:	38.66%	55.98%
Level 1 | Preferred CED | Maximum
Fair Value, Assets and Liabilities Measured On Recurring and Nonrecurring Basis [Line Items]
Our trading volatility:	69.72%	88.87%
Level 2 | Preferred CED | Minimum
Fair Value, Assets and Liabilities Measured On Recurring and Nonrecurring Basis [Line Items]
Credit-risk adjusted yields:	6.50%	6.64%
Level 2 | Preferred CED | Maximum
Fair Value, Assets and Liabilities Measured On Recurring and Nonrecurring Basis [Line Items]
Credit-risk adjusted yields:	7.55%	7.40%
Level 3 | Preferred CED
Fair Value, Assets and Liabilities Measured On Recurring and Nonrecurring Basis [Line Items]
Our trading volatility:	52.85%	67.38%
Credit-risk adjusted yields:	6.87%	6.96%
Terms (years):	11 months 15 days	1 year 1 month 6 days