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Loss Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Numerator    
Net loss $ (23,886) $ (85,978)
Denominator    
Basic and diluted weighted average common shares (in shares) 227,019 225,505
Loss per common share:    
Basic and diluted (in USD per share) $ (0.11) $ (0.38)
Approximate number of unvested restricted stock units and stock to be issued pursuant to the ESPP that have been excluded from the computation of diluted loss per share as the effect would be anti-dilutive when results from operations are at a net loss position (in shares) 2,252 2,015