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Summary of Selected Quarterly Financial Data (unaudited) (Tables)
 12 Months Ended
Jul. 31, 2020
Quarterly Financial Information Disclosure [Abstract]  
Schedule of unaudited quarterly financial data
   Quarter Ended 
Fiscal 2020  October 31,
2019		   January 31,
2020		   April 30,
2020		   July 31,
2020		 
Total revenues  $20,207    19,384    16,903    19,527 
Gross profit   5,686    5,809    4,425    7,850 
Loss before income taxes   (7,648)   (7,687)   (9,860)   (3,325)
Net loss   (7,648)   (7,687)   (9,860)   (3,325)
Basic and diluted loss per common share  $(0.16)   (0.16)   (0.21)   (0.07)
   Quarter Ended 
Fiscal 2019  October 31,
2018		   January 31,
2019		   April 30,
2019		   July 31,
2019		 
Total revenues  $21,260   $19,327   $19,662   $20,921 
Gross profit   7,021    4,579    5,302    6,346 
Income (loss) before income taxes   (5,978)   (8,408)   22,265    (5,390)
Net income (loss)   (5,978)   (8,408)   22,265    (5,390)
Basic and diluted loss per common share  $(0.13)  $(0.18)  $0.47   $(0.11)