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Net Loss Per Share Attributable to Common Stockholders - Computation of Basic and Diluted Net Loss per Share Attributable to Common Stockholders (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Earnings Per Share [Abstract]          
Net loss $ (7,885) $ (5,016) $ (22,369) $ (19,274) $ (26,000)
Accretion of convertible preferred stock to redemption value (44) (41) (131) (112)  
Net loss attributable to common stockholders $ (7,929) $ (5,057) $ (22,500) $ (19,386)  
Weighted-average shares outstanding 1,372,211 1,093,185 1,232,439 1,084,791  
Less: weighted average shares subject to repurchase (42,601) (180,347) (50,928) (247,049)  
Weighted average shares used to compute basic and diluted net loss per share 1,329,610 912,838 1,181,511 837,742  
Net loss attributable to common stockholders per share, basic and diluted $ (5.96) $ (5.54) $ (19.04) $ (23.14)