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Loss Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Numerator        
Net loss $ (25,763) $ (25,950) $ (67,836) $ (52,613)
Denominator        
Basic and diluted weighted average common shares 223,981 222,914 223,775 222,740
Loss per common share:        
Basic and diluted (in dollars per share) $ (0.12) $ (0.12) $ (0.30) $ (0.24)
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. 678 425 639 616