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Net Loss Per Share Attributable to Common Stockholders - Basic and Diluted Net Loss Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Numerator:      
Net loss $ (19,907) $ (4,123) $ (16,233)
Less: Premium on repurchase of redeemable convertible preferred stock 0 (6,506) 0
Net loss attributable to common stockholders $ (19,907) $ (10,629) $ (16,233)
Denominator:      
Weighted-average shares used to compute net loss per share attributable to common stockholders, basic and diluted 52,327,518 32,944,714 32,071,604
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share) $ (0.38) $ (0.32) $ (0.51)