Commitments - Components of lease cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Commitments
Operating lease cost	$ 477	$ 590	$ 879	$ 1,071
Variable lease cost	43	32	82	61
Short-term lease cost	108	124	226	279
Total lease cost	$ 628	$ 746	$ 1,187	$ 1,411