CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Assets:
Accumulated amortization on deferred expenses	$ 23,171	$ 23,382
Liabilities:
Accumulated accretion on deferred revenue	$ 12,758	$ 11,876
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)	277,152,450	254,770,719
Common shares, shares outstanding (in shares)	277,152,450	254,770,719