Summary of Significant Accounting Policies - Additional Information (Detail)	3 Months Ended		9 Months Ended
	Mar. 31, 2018 accounting_method	Mar. 31, 2017	Mar. 31, 2018 USD ($) accounting_method	Mar. 31, 2017	Dec. 21, 2017 USD ($)
Significant Accounting Policies [Line Items]
Number of accounting methods for revenue recognition | accounting_method	3		3
Purchase agreement, maximum receivable balances					$ 30,000,000
Factored accounts receivable			$ 18,821,000
Accounts receivable factoring fees			$ 69,000
Ship and bill
Significant Accounting Policies [Line Items]
Percentage of revenue recognized	47.00%	43.00%	43.00%	45.00%
Multiple deliverable
Significant Accounting Policies [Line Items]
Percentage of revenue recognized	30.00%	37.00%	35.00%	32.00%
Contract accounting
Significant Accounting Policies [Line Items]
Percentage of revenue recognized	23.00%	20.00%	22.00%	23.00%