Income taxes (Details) - USD ($)	3 Months Ended	9 Months Ended
Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019	Jun. 30, 2019
Income Tax Disclosure [Abstract]
Provision (benefit) for income taxes	$ 505,000	$ 194,000	$ 1,121,000	$ 1,036,000
Effective tax provision rate			8.00%	(7.00%)
Unrecognized tax benefit	5,200,000		$ 5,200,000		$ 4,600,000
Unrecognized tax benefits that would affect effective tax rate	77,000		77,000		77,000
Interest and penalties related to unrecognized tax positions accrued	$ 0		$ 0		0
Valuation allowance					$ 48,400,000

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of unrecognized tax benefits.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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