Stockholders' Equity (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at December 31, 2011			$ 29,035,665
Net loss	(10,325,464)	(6,290,546)	(23,388,120)	(20,286,414)
Foreign currency translation gain (loss)	110,625	(160,205)	106,585	(74,173)
Stock based compensation			1,500,237
Public offering common stock, net			15,790,270
Balance at September 30, 2012	23,044,637		23,044,637
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at December 31, 2011			229,244
Balance at December 31, 2011 (shares)			22,924,411
Net loss
Foreign currency translation gain (loss)
Stock based compensation			3,229
Stock based compensation (shares)			322,844
Public offering common stock, net			149,500
Public offering common stock, net (shares)			14,950,000
Balance at September 30, 2012	381,973		381,973
Balance at September 30, 2012 (shares)	38,197,255		38,197,255
Additional Paid-in-Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at December 31, 2011			784,213,871
Net loss
Foreign currency translation gain (loss)
Stock based compensation			1,497,008
Public offering common stock, net			15,640,770
Balance at September 30, 2012	801,351,649		801,351,649
Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at December 31, 2011			928,744
Net loss
Foreign currency translation gain (loss)			106,585
Stock based compensation
Public offering common stock, net
Balance at September 30, 2012	1,035,329		1,035,329
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at December 31, 2011			(1,552,382)
Balance at December 31, 2011 (shares)			165,906
Net loss
Foreign currency translation gain (loss)
Stock based compensation
Stock based compensation (shares)
Public offering common stock, net
Public offering common stock, net (shares)
Balance at September 30, 2012	(1,552,382)		(1,552,382)
Balance at September 30, 2012 (shares)	165,906		165,906
Accumulated Deficit
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at December 31, 2011			(754,783,812)
Net loss			(23,388,120)
Stock based compensation
Stock based compensation (shares)
Public offering common stock, net
Balance at September 30, 2012	$ (778,171,932)		$ (778,171,932)