Income Taxes - Additional Information (Details) - USD ($)	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2016	Jun. 30, 2017
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards, Domestic	$ 56,789,000
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount	$ 0	$ (489,000)
Tax Credit Carryforward, Expiration Period	20 years
Other Assets, Noncurrent	$ 651,000	55,000
Unrecognized Tax Benefits	251,000	251,000		$ 337,000
Research and development credits	751,000
Unrecognized benefits resulting in net operating loss carry forward	11,189,000
Research And Development Credits Acquired	140,000
Deferred Tax Assets, Valuation Allowance, Current	20,494,000	21,554,000
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	(1,060,000)
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax	950,000
Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount	649,000
Deferred Tax Assets, Net, Noncurrent	475,000	975,000
Unrecognized Tax Benefits, Interest on Income Taxes Expense	6,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	143,000
Unrecognized Tax Benefits, Interest on Income Taxes Expense	6,000
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	33,000	27,000
Deferred Tax Assets, Tax Credit Carryforwards, Research	$ 751,000
Maximum Number of Common Stock to be Owned by Investor as Beneficial Ownership	4,176,180
Research Tax Credit Carryforward [Member]
Operating Loss Carryforwards [Line Items]
Unrecognized Tax Benefits	$ 35,000
Other Noncurrent Liabilities [Member] | Research Tax Credit Carryforward [Member]
Operating Loss Carryforwards [Line Items]
Unrecognized Tax Benefits	41,000
Prepaid Expenses and Other Current Assets [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax	475,000
Deferred Tax Assets change In Valuation Allowance Due To Miscellaneous True Up Adjustments [Member]
Operating Loss Carryforwards [Line Items]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	460,000
Deferred Tax Assets change In Valuation Allowance Usage of Deferred Tax Assets [Member]
Operating Loss Carryforwards [Line Items]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	124,000
Deferred Tax Assets change In Valuation Allowance Due To Other Deferred Tax Adjustments [Member]
Operating Loss Carryforwards [Line Items]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	304,000
Deferred Tax Assets Change in Tax Rates [Member]
Operating Loss Carryforwards [Line Items]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	244,000
Deferred Tax Assets, Change In Valuation Allowance, Change Due to Finalizing AMT Liability [Member]
Operating Loss Carryforwards [Line Items]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	25,000
Deferred Tax Assets, Change in Valuation Allowance, Due to Elimination of Deferred Tax Assets From Liquidated Foreign Subsidiaries [Member]
Operating Loss Carryforwards [Line Items]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	2,010,000
Domestic Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	56,789,000
Domestic Tax Authority [Member] | Research and Development Tax Credit [Member]
Operating Loss Carryforwards [Line Items]
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount			$ 719,000
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount	66,000	$ 287,000
Operating Loss Carryforwards	29,977,000
State and Local Jurisdiction [Member] | Research and Development Tax Credit [Member]
Operating Loss Carryforwards [Line Items]
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount			$ 675,000
Other Assets, Current	36,000
Other Assets, Noncurrent	49,000
Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	$ 8,296,000