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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
Mar. 31, 2016
Mar. 31, 2015
Numerator:    
Net loss $ (7,409) $ (8,165)
Denominator:    
Weighted-average common shares outstanding 76,488 74,417
Less: Weighted-average unvested common shares subject to repurchase or forfeiture 0 (310)
Weighted-average shares used to compute net loss per share, basic and diluted 76,488 74,107
Net loss per share, basic and diluted (usd per share) $ (0.10) $ (0.11)