Revenue Recognition (Tables)

12 Months Ended

Jul. 31, 2019

Revenue from Contract with Customer [Abstract]

Schedule Of Segment Revenue And Revenue Percentage [Table Text Block]

The following table represents clinical services net revenues and percentages by type of customer:

	Year ended July 31, 2019					Year ended July 31, 2018					Year ended July 31, 2017
Revenue category	Revenue		%			Revenue		%			Revenue		%
Third-party payers	$	26,653		52		$	41,370		58		$	43,059		58
Medicare		10,898		21			12,111		17			12,705		17
HMO’s		6,213		12			11,359		16			10,263		14
Patient self-pay		7,351		15			6,237		9			8,662		11
Total	$	51,115		100	%	$	71,077		100	%	$	74,689		100	%

Schedule of Product Revenue By Geographical [Table Text Block]

Products revenue by geography is as follows:

	2019		2018		2017
United States	$	16,965	$	15,524	$	16,533
Europe		5,922		6,326		5,659
Rest of the world		7,168		7,374		7,000
Products revenue	$	30,055	$	29,224	$	29,192