Leases - Lease right-of-use assets and liabilities (Details) $ in Thousands	Sep. 30, 2019 USD ($)
Lease Right-of-Use Assets
Operating lease right-of-use assets	$ 8,877
Finance lease right-of-use assets	347
Lease right-of-use assets	9,224
Operating lease liabilities	9,401
Finance lease liabilities	690
Lease liabilities	$ 10,091