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Stockholders' Equity (Tables)
 6 Months Ended
Jan. 31, 2017
Stockholders' Equity Note [Abstract]  
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block] The amounts of share-based compensation expense recognized in the periods presented are as follows:

   Three months ended
January 31,		   Six months ended
January 31,		 
   2017   2016   2017   2016 
Stock options  $236   $104   $382   $208 
Restricted stock   5    6    10    13 
   $241   $110   $392   $221 
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] The following table sets forth the amount of expense related to share-based payment arrangements included in specific line items in the accompanying statements of operations:

   Three months ended
January 31,		   Six months ended
January 31,		 
   2017   2016   2017   2016 
Cost of clinical laboratory services  $1   $2   $3   $3 
Selling, general and administrative   240    108    389    218 
   $241   $110   $392   $221 
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] The following table summarizes stock option activity during the six month period ended January 31, 2017:

   Options   Weighted
Average
Exercise
Price		   Weighted
Average
Remaining
Contractual
Term		  Aggregate
Intrinsic
Value (000s)		 
Outstanding at July 31, 2016   1,808,875   $3.43         
Awarded    493,996   $7.07         
Exercised    (23,096)  $2.89      $149 
Cancelled or expired    (5,000)  $4.47         
Outstanding at end of period    2,274,775   $4.23   1.4 years  $5,797 
Exercisable at end of period    1,379,555   $3.18           0.5 years  $4,853 
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] A summary of the activity pursuant to the Company’s unvested restricted stock awards for the six months ended January 31, 2017 is as follows:

   Awards   Weighted
Average
Award Price		 
Outstanding at July 31, 2016   8,501   $4.13 
Awarded   —    — 
Vested   (1,501)  $(3.89)
Forfeited   —    — 
Unvested at end of period   7,000   $2.30