Stockholders' Equity (Tables)

6 Months Ended

Jan. 31, 2018

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,
	2018		2017		2018		2017
Stock options	$	205	$	236	$	407	$	382
Restricted stock		3		5		6		10
	$	208	$	241	$	413	$	392

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,
	2018		2017		2018		2017
Cost of clinical laboratory services	$	—	$	1	$	—	$	3
Selling, general and administrative		208		240		413		389
	$	208	$	241	$	413	$	392

Share-based Compensation, Stock Options, Activity [Table Text Block]

The following table summarizes stock option activity during the six month period ended January 31, 2018:

	Options			Weighted Average Exercise Price		Weighted Average Remaining Contractual Term	Aggregate Intrinsic Value (000s)
Outstanding at July 31, 2017		2,130,995		$	4.26
Awarded		112,580		$	8.36
Exercised		(569,602	)	$	3.02		$	5,594
Cancelled or expired		(26,334	)	$	5.82
Outstanding at end of period		1,647,639		$	4.95	2.8 years	$	6,785
Exercisable at end of period		1,109,811		$	4.18	1.4 years	$	3,533

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, 2018 is as follows:

	Awards			Weighted Average Award Price
Outstanding at July 31, 2017		7,436		$	4.45
Awarded		—			—
Vested		(2,062	)	$	(5.92	)
Forfeited		—			—
Unvested at end of period		5,374		$	3.23