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Net Loss per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Numerator:        
Net loss $ (5,093) $ (4,670) $ (13,806) $ (21,351)
Weighted-average shares outstanding        
Weighted-average shares used to compute net loss per share, basic and diluted 113,203,074 102,791,023 106,333,836 102,727,198
Basic and diluted net loss per share $ (0.04) $ (0.05) $ (0.13) $ (0.21)