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Accrued Liabilities (Tables)
3 Months Ended
Oct. 31, 2017
Payables and Accruals [Abstract]  
Schedule of Accrued Liabilities [Table Text Block] Accrued liabilities consist of the following:

   October 31,
2017
   July 31,
2017
 
Payroll, benefits, and commissions  $6,437   $4,092 
Professional fees   554    442 
Legal fee expense   327    599 
Research and development   143    143 
Other   1,852    1,444 
   $9,313   $6,720