Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Mar. 31, 2018	Jun. 30, 2017
Significant Accounting Policies [Line Items]
Highly liquid investments, original maturity period	3 months
Unmarketable inventory value	$ 0
Operating loss carry forwards for federal income tax		$ 371,100
Operating loss carry forwards for state income tax		$ 186,000
Liability for uncertain tax positions	$ 0
Statutory rate	21.00%	35.00%
Percentage of current income able to be offset by operating loss carryforward	80.00%
Prepaid expenses
Significant Accounting Policies [Line Items]
Research and development cost capitalized	$ 3,200	$ 25
Other current assets
Significant Accounting Policies [Line Items]
Research and development cost capitalized	$ 5,100	$ 0
Minimum
Significant Accounting Policies [Line Items]
Net operating loss carry forwards expiration year	2018
Maximum
Significant Accounting Policies [Line Items]
Net operating loss carry forwards expiration year	2037