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Income (Loss) Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Numerator        
Net income (loss) $ (6,999) $ 2,296 $ (74,835) $ (50,317)
Denominator        
Basic (in shares) 224,182 223,056 223,912 222,847
Restricted stock units (in shares) 0 525 0 0
Diluted (in shares) 224,182 223,581 223,912 222,847
Income (loss) per common share:        
Basic (in dollars per share) $ (0.03) $ 0.01 $ (0.33) $ (0.23)
Diluted (in dollars per share) $ (0.03) $ 0.01 $ (0.33) $ (0.23)
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 income (loss) per share as the effect would be anti-dilutive when results from operations are at a net loss position. 1,075 0 779 624