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7. Related party transactions (Detail) - Related Party Transactions (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Development costs:      
Services rendered by directors and officers $ 60,000 $ 60,000  
Interest expense:      
Promissory notes and lines of credit issued to director and relatives of directors 406,732 519,403  
Stock options granted to a director and officer 5,377,907 914,491  
Stock options granted to relatives of directors   1,493,702  
Selling, general and administration:      
Compensation to a director and officer 5,597,662 2,682,855 597,649
Stock options and share based payments to a director and officer $ 180,402 $ 209,898