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Leases - Supplemental lease terms (Details)
Jun. 30, 2020
Dec. 31, 2019
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 6.77% 7.33%
Weighted-average remaining lease terms - finance lease (years) 12 years 6 months  
Weighted-average discount rate - finance lease 7.80%