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Condensed Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Condensed Condensed Consolidated Balance Sheets [Abstract]    
Development Stage Enterprise, Deficit Accumulated During Development Stage $ 162,731 $ 135,325
Shareholders' equity:    
Common stock, no par value $ 0  
Capital stock, shares outstanding (in shares) 81,721,960 81,563,498