v3.20.4
Net loss per share attributable to common stockholders (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Numerator:      
Net loss attributable to common stockholders, basic and diluted $ (17,093) $ (10,296) $ (1,220)
Denominator:      
Weighted average number of common stock, basic and diluted (in shares) 44,440 43,977 42,066
Net loss per share attributable to common stockholders:      
Basic and diluted (in dollars per share) $ (0.38) $ (0.23) $ (0.03)