Computation of Basic and Diluted Earnings Per Share (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Schedule of Computation of Basic and Diluted Earnings Per Share [Line Items]
Numerator for basic earnings per share calculation - income attributable to common shareholders	$ 3,106,826	$ (2,208,031)	$ (4,174,072)	$ (3,963,127)
Interest on 8% convertble promissory notes	179,537
Dividends for 10% convertible preferred stock	175,050
Accretion of discount on 10% convertible preferred stock	226,457
Numerator for diluted earnings per share calculation - income attributable to common shareholders	$ 3,687,870
Denominator for basic earnings per share - weighted-average shares outstanding	29,563,990	26,070,061
Denominator for diluted earnings per share	58,821,822	26,070,061
Basic earnings per share	$ 0.11	$ (0.08)
Diluted earnings per share	$ 0.06	$ (0.08)
Options and warrants
Schedule of Computation of Basic and Diluted Earnings Per Share [Line Items]
Denominator for basic earnings per share - weighted-average shares outstanding	41,128
8% convertible promissory notes
Schedule of Computation of Basic and Diluted Earnings Per Share [Line Items]
Denominator for basic earnings per share - weighted-average shares outstanding	22,195,474
10% convertible preferred stock warrants
Schedule of Computation of Basic and Diluted Earnings Per Share [Line Items]
Denominator for basic earnings per share - weighted-average shares outstanding	7,021,230