Outstanding Warrants And Exercise Price (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Underlying Warrants	1,002,778
Series B Warrant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Underlying Warrants	100,000
Exercise Price	$ 3.00
Dates of Expiration	2013-12
Remaining Contractual Term (in years)	1 year
Series D Warrant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Underlying Warrants	200,000
Exercise Price	$ 1.00
Dates of Expiration	2014-12
Remaining Contractual Term (in years)	2 years
Convertible Note Warrants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Underlying Warrants	69,445
Exercise Price	$ 1.80
Dates of Expiration	2014-09
Remaining Contractual Term (in years)	1 year 6 months
Secured Note Warrants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Underlying Warrants	333,333
Exercise Price	$ 1.60
Dates of Expiration	2015-08
Remaining Contractual Term (in years)	2 years 8 months 12 days
Maximum | Series C Warrant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Underlying Warrants	200,000
Exercise Price	$ 1.00
Dates of Expiration	2015-03
Remaining Contractual Term (in years)	2 years 8 months 12 days
Minimum | Series C Warrant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Underlying Warrants	100,000
Exercise Price	$ 5.00
Dates of Expiration	2013-12
Remaining Contractual Term (in years)	1 year