Financial Instruments and Fair Value Measurements - Liabilities measured at FV (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Jun. 30, 2019
Interest rate swap
Financial instruments and fair value measurements
Notional amount			$ 20,000
Level 2 | Interest rate swap | Other liabilities.
Financial instruments and fair value measurements
Derivative liabilities	$ 1,100	$ 300
Recurring basis
Financial instruments and fair value measurements
Liabilities	1,064	336
Recurring basis | Interest rate swap | Other liabilities.
Financial instruments and fair value measurements
Derivative liabilities	1,064	336
Recurring basis | Level 2
Financial instruments and fair value measurements
Liabilities	1,064	336
Recurring basis | Level 2 | Interest rate swap | Other liabilities.
Financial instruments and fair value measurements
Derivative liabilities	$ 1,064	$ 336