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Shareholders' Equity (Unvested Restricted Stock Units Activity Roll-Forward) (Details) - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Unvested Restricted Stock Units - Number of Shares    
Unvested at December 31, 2019: 3,112,426  
Granted 2,137,817  
Vested (1,834,406)  
Canceled (239,232)  
Unvested at December 31, 2020: 3,176,605 3,112,426
Expected to vest after December 31, 2020 2,947,031  
Unvested Restricted Stock Units - Weighted Average Grant Date Fair Value    
Unvested at December 31, 2019: $ 4.06  
Granted 3.42 $ 3.81
Vested 3.93  
Canceled 4.28  
Unvested at December 31, 2020: 3.68 $ 4.06
Expected to vest after December 31, 2020 $ 3.68