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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Assets:    
Accumulated amortization on deferred expenses $ 31,095 $ 27,180
Liabilities:    
Accumulated accretion on deferred revenue $ 31,309 $ 30,548
Equity:    
Preferred shares, par value (usd per share) $ 0.0001 $ 0.0001
Preferred shares, authorized shares (in shares) 100,000,000 100,000,000
Common shares, par value (usd per share) $ 0.0001 $ 0.0001
Common shares, authorized shares (in shares) 400,000,000 400,000,000
Common shares, shares issued (in shares) 238,037,177 234,575,225
Common shares, shares outstanding (in shares) 238,037,177 234,575,225
Series C [Member]    
Equity:    
Preferred shares, liquidation preference $ 96,770 $ 96,770
Preferred shares, convertible preferred, shares issued (in shares) 1,935,400 1,935,400
Preferred shares, redeemable preferred, shares outstanding (in shares) 1,935,400 1,935,400
LCIF [Member]    
Assets:    
Accumulated amortization on deferred expenses $ 4,910 $ 5,634
Liabilities:    
Accumulated accretion on deferred revenue $ 3,180 $ 3,148
Equity:    
Common shares, par value (usd per share) $ 0.0001