Assumptions Used In Binomial Valuation Model and Black-Scholes Valuation Model (Detail)	Dec. 31, 2009 Year	Jun. 30, 2012 Monte Carlo Option Pricing Model Year	Jun. 30, 2011 Black Scholes Option Pricing Model	Jun. 30, 2012 Minimum Monte Carlo Option Pricing Model Year	Jun. 30, 2011 Minimum Black Scholes Option Pricing Model Year	Jun. 30, 2011 Maximum Black Scholes Option Pricing Model Year
Class of Warrant or Right [Line Items]
Risk-free interest rate	2.14%			0.37%	0.18%	1.01%
Expected volatility	105.00%			70.00%	45.00%	97.00%
Expected dividend yield	0.00%	0.00%	0.00%
Expected life in years	5	12		2.44	0.92	3.43