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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
CONDENSED CONSOLIDATED BALANCE SHEETS    
Allowance for doubtful accounts $ 170 $ 132
Accumulated amortization $ 156,870 $ 127,172
Preferred share, par value $ 0.01 $ 0.01
Preferred share, shares authorized 50,000,000 50,000,000
Preferred share, shares issued 0 0
Preferred share, shares outstanding 0 0
Common share, par value $ 0.01 $ 0.01
Common share, shares authorized 600,000,000 600,000,000
Common share, shares issued 157,353,191 152,979,479
Common share, shares outstanding 157,353,191 152,979,479