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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

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