CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Assets:
Accumulated amortization on deferred expenses	$ 35,072	$ 31,095
Liabilities:
Accumulated accretion on deferred revenue	$ 26,081	$ 31,309
Equity:
Preferred shares, par value (usd per share)	$ 0.0001	$ 0.0001
Preferred shares, authorized shares (in shares)	100,000,000	100,000,000
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
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)	240,689,081	238,037,177
Common shares, shares outstanding (in shares)	240,689,081	238,037,177
LCIF [Member]
Assets:
Accumulated amortization on deferred expenses	$ 5,878	$ 4,910
Liabilities:
Accumulated accretion on deferred revenue	$ 355	$ 3,180
Equity:
Common shares, par value (usd per share)	$ 0.0001