Stockholders' Equity - Stockholders' Equity Roll-forward (Detail) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance (in shares)	47,761,119
Beginning Balance	$ 14,222,681
Share-based compensation (in shares)	0
Share-based compensation	128,010
Issuance of common stock to investors (in shares)	2,038,079
Issuance of common stock to investors	1,332,251
Foreign currency translation	(155,791)	51,944
Net loss attributable to stockholders	(6,903,920)	(7,814,890)
Ending Balance (in shares)	49,799,198
Ending Balance	8,623,231
Proceeds from issuance of common stock	1,407,606
Sales commission as a percentage of gross proceeds	3.00%
Sales commission on issuance of common stock	$ 75,355