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Common Shares (Summary Of Restricted Stock Units Activity) (Details) - Restricted Stock Units (RSUs) [Member]
9 Months Ended
Sep. 30, 2016
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unvested, Number of units, beginning of period (in shares) | shares 4,085,446
Vested, Number of units (in shares) | shares (2,475,046)
Granted, Number of units (in shares) | shares 1,057,987
Unvested, Number of units, end of period (in shares) | shares 2,668,387
Unvested, weighted average fair value, beginning of year (in dollars per share) | $ / shares $ 0.44
Vested, Weighted average fair value (in dollars per share) | $ / shares 0.50
Granted, Weighted average fair value (in dollars per share) | $ / shares 0.84
Unvested, weighted average fair value, end of year (in dollars per share) | $ / shares $ 0.55
Minimum [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting period 1 year