Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended	9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Jun. 30, 2022
Schedule of Income Taxes [Line Items]
Income tax expense (benefit)	$ 0	$ (8)		$ (296)	$ (236)
Federal tax expense (benefit)	0	(32)		(296)	(221)
State tax expense (benefit)	0	$ 24		0	$ (15)
Deferred income tax valuation allowance	8,071			8,071
Net operating loss carry-forward	$ 13,400			$ 13,400
Net operating loss carryforward expiration year			2025
For tax years beginning after March 31, 2018 and before January 1, 2022 [Member]
Schedule of Income Taxes [Line Items]
Percentage of AMT credit refundable				50.00%
For the 2021 tax year [Member]
Schedule of Income Taxes [Line Items]
Percentage of AMT credit refundable				100.00%
Later Than [Member] | Scenario, Forecast [Member]
Schedule of Income Taxes [Line Items]
Federal alternative minimum tax, tax credits						$ 296