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Commitments - Operating leases, supplemental cash flow information (Details)
Jun. 30, 2020
Jun. 30, 2019
Commitments and Contingencies Disclosure [Abstract]    
Weighted-average remaining lease terms—operating leases (years) 1 year 6 months 2 years 6 months
Weighted-average discount rate—operating leases (in percentage) 7.60% 7.60%