Statements of Stockholders' Equity and Comprehensive Income (Loss) (Parenthetical) (USD $)	1 Months Ended																3 Months Ended											6 Months Ended		9 Months Ended	12 Months Ended			12 Months Ended			4 Months Ended
	Nov. 30, 2011	Oct. 31, 2011	Aug. 31, 2011	May 31, 2011	Nov. 30, 2010	Oct. 31, 2009	Oct. 31, 2008	May 31, 2008	Mar. 31, 2008	Jan. 31, 2008	Aug. 31, 2007	Mar. 31, 2007	Dec. 31, 2006	Sep. 30, 2006	Jul. 31, 2006	Jan. 31, 2006	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Jun. 30, 2009	Mar. 31, 2009	Dec. 31, 2008	Sep. 30, 2008	Jun. 30, 2008	Mar. 31, 2008	Nov. 30, 2007	Dec. 31, 2009	Dec. 31, 2007	Sep. 30, 2011	Dec. 31, 2010	Dec. 31, 2007	Nov. 30, 2005	Dec. 31, 2007 Class A warrants [Member]	Dec. 31, 2008 Class B warrants [Member]	Dec. 31, 2007 Class B warrants [Member]	Dec. 31, 2007 Maximum [Member]	Dec. 31, 2007 Minimum [Member]
Stock option exercised, per share													$ 0.10	$ 0.10			$ 2.76	$ 2.73	$ 2.90	$ 0.10	$ 2.76	$ 0.10	$ 4.25	$ 2.90	$ 2.73	$ 0.10		$ 4.25	$ 4.25	$ 0.10	$ 3.17	$ 0.10					$ 2.76	$ 2.51
Proceeds from sale of common stock, per share																																	$ 0.04
Transfer of assets at historical cost, per share																$ 0.03
Proceeds from IPO, per unit															$ 5.50
Stock issued to bridge loan lenders, per share															$ 2.75
Conversion of public warrants, per share																																		$ 6.60	$ 11.00	$ 11.00
Redemption of public warrants, per share																																$ 0.25
Common stock under private placement, per share						$ 6.50	$ 6.176		$ 9.262		$ 7.198	$ 5.77
Public warrants under private placement, per share									$ 3.954		$ 1.91
Exercise of representative's warrants, per unit										6.60																	6.60
Proceeds from secondary public offering, per share								$ 14.00
Proceeds from public offering, per share					$ 4.15	$ 6.50
Issuance of commons stock to service provider, per share				$ 1.31
Proceeds from private offering, per share			$ 1.15
At-the-Market offering per share	$ 0.83	$ 0.81