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Net loss per share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Numerator:        
Net loss $ (7,228) $ (8,673) $ (12,590) $ (9,094)
Accretion of redeemable convertible preferred stock to redemption value   (70)   (70)
Net loss attributable to common stockholders, basic and diluted $ (7,228) $ (8,743) $ (12,590) $ (9,164)
Denominator:        
Weighted average common shares outstanding, basic and diluted 3,268,390 92,171 1,726,795 66,422
Net loss per share attributable to common stockholders, basic and diluted $ (2.21) $ (94.86) $ (7.29) $ (137.97)
Number of weighted average restricted common stock 56,765,000 134,229,000 63,801,000 159,878,000