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Note 12 - Loss Per Common Share - Calculation of Basic and Diluted Loss Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Numerator            
Net loss $ (12,617) $ (23,886) $ (34,245) $ (85,978) $ (36,503) $ (120,223)
Denominator            
Basic and diluted weighted average common shares (in shares) [1] 228,013   225,853   227,519 225,855
Loss per common share:            
Basic and diluted (in dollars per share) $ (0.06)   $ (0.15)   $ (0.16) $ (0.53)
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) 1,329   707   1,688 955
[1] 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. 1,329 707 1,688 955