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Commitments and Contingencies - Additional Information (Details)
shares in Millions
12 Months Ended
May 11, 2017
May 03, 2017
USD ($)
shares
Jun. 09, 2016
item
Jun. 30, 2017
USD ($)
patent
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Operating Lease [Member]            
Guarantor Obligations [Line Items]            
Lease expiration date       2031-10    
Base annual rate       $ 1,000,000    
Rental expense       900,000 $ 800,000 $ 800,000
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]            
2018       974,000    
2019       974,000    
2020       974,000    
2021       974,000    
2022       1,020,000    
Thereafter       9,742,000    
Goldenberg and Sullivan            
Guarantor Obligations [Line Items]            
Arbitration cost incurred       0    
Goldenberg and Sullivan | Maximum            
Guarantor Obligations [Line Items]            
Arbitration cost incurred   $ 650,000        
Employment Agreement [Member] | Sullivan Agreement [Member]            
Guarantor Obligations [Line Items]            
Settlement cost   4,200,000        
Litigation Settlement Payment in Dispute   900,000        
Employment Agreement [Member] | Goldenberg Agreement [Member]            
Guarantor Obligations [Line Items]            
Settlement cost   2,700,000        
Litigation Settlement Payment In Dispute One   1,800,000        
Employment Agreement [Member] | Goldenberg Agreement [Member] | Minimum            
Guarantor Obligations [Line Items]            
Payments for additional incentive compensation   $ 150,000        
Percentage Of Consideration Received From Dispositions   20.00%        
Employment Agreement [Member] | Goldenberg Agreement [Member] | Maximum            
Guarantor Obligations [Line Items]            
Term Of Compensation Contract Upon Dispositions Of Undeveloped Assets   3 years        
Employment Agreement [Member] | Goldenberg and Sullivan            
Guarantor Obligations [Line Items]            
Arbitration cost incurred       $ 0    
Employment Agreement [Member] | Goldenberg and Sullivan | Maximum            
Guarantor Obligations [Line Items]            
Arbitration cost incurred   $ 650,000        
Restricted Units Vesting Based on Certain Market Conditions [Member] | Goldenberg Agreement [Member]            
Guarantor Obligations [Line Items]            
Restricted stock units granted in period | shares   1.5        
Class Action Shareholder Federal Securities Cases            
Guarantor Obligations [Line Items]            
Number of purported class action cases filed | item     2      
Patent litigation            
Guarantor Obligations [Line Items]            
Number of patents owned | patent       3    
Number of days case stayed 90 days