Income Taxes - Additional Information (Details) - USD ($)	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Operating Loss Carryforwards [Line Items]
U.S. Federal NOL carryforwards	$ 51,438,000
Federal AMT credit carryforward		$ 950,000
Income Tax Credits and Adjustments, Subject to Refund	475,000
Deferred Tax Assets, Valuation Allowance	11,697,000	20,435,000
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	8,738,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	316,000
Unrecognized Tax Benefits, Interest on Income Taxes Expense	10,000
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	$ 43,000	$ 33,000
Maximum Number of Common Stock to be Owned by Investor as Beneficial Ownership	4,176,180
Research and development
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards, federal purposes	$ 751,000
Tax credit carryforward period	20 years
Deferred Tax Assets Change In Valuation Allowance Due To The Movement Of German Deferred Taxes [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Valuation Allowance	$ 49,000
Deferred Tax Assets change In Valuation Allowance Usage of Deferred Tax Assets [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Valuation Allowance	8,689,000
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	22,856,000
Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 8,258,000