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Net Loss Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Basic and diluted numerator:        
Net loss attributable to common stockholders $ (10,037) $ (6,278) $ (25,349) $ (15,073)
Denominator:        
Weighted-average common shares outstanding used in computing basic and diluted net loss (in shares) 40,473,520 31,395,626 38,514,179 31,376,502
Basic and diluted net loss per common share (in dollars per share) $ (0.25) $ (0.20) $ (0.66) $ (0.48)