Correction of previously issued consolidated financial statements (Statement of Operations and Comprehensive Income (Loss) Information) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Research and development expenses	$ (1,147,359)	$ (823,735)	$ (3,265,290)	$ (2,302,163)
Selling and distribution expenses	(1,423,372)	(1,498,955)	(3,904,771)	(3,654,303)
General and administrative expenses, including stock-based compensation	(4,035,269)	(2,200,960)	(8,313,737)	(6,406,295)
Interest expenses	(63,935)	(105,115)	(377,376)	(365,257)
Loss before taxes	1,123,426	(704,193)	1,996,074	(527,672)
Net loss	644,362	(630,510)	1,151,261	(596,767)
Comprehensive loss	1,016,805	(568,711)	1,385,740	623,618
Loss per share of common stock attributable to the Company
-Basic	$ 0.05	$ (0.05)	$ 0.08	$ (0.04)
-Diluted	$ 0.05	$ (0.05)	$ 0.08	$ (0.04)
As Previously Reported [Member]
Research and development expenses		(793,702)		(2,302,163)
Selling and distribution expenses		(1,487,490)		(3,654,303)
General and administrative expenses, including stock-based compensation		(2,242,458)		(6,406,295)
Interest expenses		(140,240)		(183,450)
Loss before taxes		(739,318)		(345,865)
Net loss		(665,635)		(414,960)
Comprehensive loss		(603,836)		805,425
Loss per share of common stock attributable to the Company
-Basic		$ (0.05)		$ (0.03)
-Diluted		$ (0.05)		$ (0.03)
Corrections [Member]
Research and development expenses		(30,033)
Selling and distribution expenses		(11,465)
General and administrative expenses, including stock-based compensation		41,498
Interest expenses		35,125		(181,807)
Loss before taxes		35,125		(181,807)
Net loss		35,125		(181,807)
Comprehensive loss		$ 35,125		$ (181,807)
Loss per share of common stock attributable to the Company
-Basic				$ (0.01)
-Diluted				$ (0.01)