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Net Loss Per Share - Computation of Net Loss Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Earnings Per Share [Abstract]                
Weighted average shares outstanding - basic and diluted (shares) 131,455,727     111,178,880     118,664,914 110,291,090
Net loss $ (48,452) $ (32,085) $ (40,572) $ (25,985) $ (28,395) $ (19,259) $ (121,109) $ (73,639)
Net loss per share - basic and diluted ($ per share) $ (0.37)     $ (0.23)     $ (1.02) $ (0.67)