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Commitments - Section H (Details)
$ in Thousands
3 Months Ended
Sep. 12, 2017
USD ($)
installment
shares
Sep. 05, 2017
Oct. 31, 2017
USD ($)
Jul. 31, 2017
USD ($)
Other Commitments [Line Items]        
Accrued liabilities, current     $ 2,094 $ 1,432
Accrued salaries and wages     653 $ 1,701
Separation Agreement        
Other Commitments [Line Items]        
Expiration period of resignation revocation   7 days    
Payments for accrued obligations $ 1,130      
Other commitments, payment period 3 days      
Payments for postemployment benefits $ 1,440      
Options granted (in shares) | shares 948,000      
Maximum period of advisement by former officer 12 months      
Payments for other commitments     1,610  
Accrued salaries and wages     $ 962  
Separation Agreement | Minimum        
Other Commitments [Line Items]        
Number of installment payments | installment 1      
Separation Agreement | Maximum        
Other Commitments [Line Items]        
Number of installment payments | installment 2