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Net Loss Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Earnings Per Share [Abstract]            
Net loss $ (11,242) $ (10,669) $ (24,060) $ (14,365) $ (21,911) $ (38,425)
Weighted average common shares outstanding (in shares) 107,535   105,485   107,279 105,139
Net loss per share, basic and diluted (in dollars per share) $ (0.10)   $ (0.23)   $ (0.20) $ (0.37)