XML 28 R15.htm IDEA: XBRL DOCUMENT v3.19.2
Basis of Presentation (Tables)
9 Months Ended
Apr. 30, 2019
Accounting Policies [Abstract]  
Schedule of disaggregated revenue
   Three months ended
April 30,
   Nine months ended
April 30,
 
   2019   2018   2019   2018 
Service revenue  $1,455   $189   $4,340   $373 
Product revenue   30    7    153    30 
Total operating revenues  $1,485   $196   $4,493   $403