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Net Loss Per Share - Schedule of Historical Basic and Diluted Net Loss Per Share (Detail) - 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 $ (6,725) $ (9,310) $ (14,134) $ (17,475)
Denominator:        
Weighted-average common shares outstanding 77,144 75,126 76,813 74,759
Less: Weighted-average unvested common shares subject to repurchase or forfeiture 0 (115) 0 (231)
Weighted-average shares used to compute net loss per share, basic and diluted 77,144 75,011 76,813 74,528
Net loss per share, basic and diluted (usd per share) $ (0.09) $ (0.12) $ (0.18) $ (0.23)