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Net Loss Per Share - Computation of Basic and Diluted Net Loss Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Numerator:    
Net loss $ (5,713) $ (4,318)
Denominator:    
Weighted average shares used to compute net loss per share, basic and diluted (in shares) 122,428 116,730
Net loss per share, basic and diluted (in dollars per share) $ (0.05) $ (0.04)