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Net Loss Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Numerator:        
Net loss available for common shareholders - basic and diluted $ (3,476) $ (2,769) $ (7,032) $ (6,731)
Denominator:        
Weighted-average shares outstanding - basic and diluted 51,567 46,663 49,566 45,818
Net loss per share - basic and diluted $ (0.07) $ (0.06) $ (0.14) $ (0.15)