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Leases - Supplemental lease terms (Details) | Sep. 30, 2020 | Dec. 31, 2019
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Leases [Abstract] |  |
Weighted-average remaining lease terms - operating leases (years) | 5 years 10 months 13 days | 3 years 4 months 17 days
Weighted-average discount rate - operating leases | 8.64% | 7.33%
Weighted-average remaining lease terms - finance lease (years) | 12 years 6 months |
Weighted-average discount rate - finance lease | 7.80% |

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