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Equity (Tables)
3 Months Ended
Oct. 31, 2017
Equity [Abstract]  
Schedule of options warrant activity
  Warrants  Weighted-
average
Exercise
Price
  Weighted-
average
Remaining
Contractual
Term 
(in years)
  Aggregate
Intrinsic
Value
(in thousands)
 
Outstanding as of August 1, 2017  111,378  $43.68   1.4  $15,118 
Granted  17,251   179.60         
Exercised  (30,475)  34.70         
Cancelled/Forfeited              
Outstanding and exercisable as of October 31, 2017  98,154  $70.35   1.1  $10,911 
Schedule of warrants and excercisable
  Warrants Outstanding and Exercisable 
  Number
Outstanding
  Weighted-
Average
Remaining Life
In Years
  Weighted-
Average
Exercise
Price
  Number
Exercisable
 
Exercise prices:            
$34.70  74,004   1.1  $34.70   74,004 
$  179.18 - $180.48  24,150   1.1   179.61   24,150 
   98,154   1.1  $70.35   98,154