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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)

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