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Net Loss per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Numerator:        
Net loss $ (423) $ (7,671) $ (8,713) $ (16,681)
Weighted-average shares outstanding        
Weighted-average shares used to compute net loss per share, basic and diluted 102,862,404 102,709,405 102,861,475 102,694,756
Basic and diluted net loss per share $ 0.00 $ (0.07) $ (0.08) $ (0.16)