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Net Loss Per Share Attributable to Common Stockholders - Computation of Basic and Diluted Net Loss Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Earnings Per Share [Abstract]        
Net loss attributable to common stockholders $ (20,924) $ (11,505) $ (54,341) $ (29,923)
Weighted-average shares used to compute net loss per share attributable to common stockholders, basic and diluted (in shares) 74,261 22,679 40,688 22,004
Net loss per share attributable to common stockholders, basic and diluted (in usd per share) $ (0.28) $ (0.51) $ (1.34) $ (1.36)