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Net Loss Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
BASIC AND DILUTED                      
Weighted average number of common shares outstanding                 35,266 33,003 26,784
Net loss $ (3,047) $ (3,343) $ (3,120) $ (3,570) $ (2,128) $ (2,144) $ (3,427) $ (1,588) $ (13,080) $ (9,287) $ (17,145)
Net loss per share - basic and diluted $ (0.08) $ (0.09) $ (0.09) $ (0.11) $ (0.07) $ (0.06) $ (0.10) $ (0.05) $ (0.37) $ (0.28) $ (0.64)