Deferred Revenue - Summary of Deferred Revenue Activity (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Oct. 31, 2017	Jul. 31, 2017
Movement in Deferred Revenue [Roll Forward]
Balance at beginning of period	$ 2,561	$ 2,600
Recognized as revenue	(22)	(39)
Balance at end of period	2,539	2,561
OORT
Movement in Deferred Revenue [Roll Forward]
Balance at beginning of period	0	0
Recognized as revenue	0	0
Balance at end of period	0	0
BED
Movement in Deferred Revenue [Roll Forward]
Balance at beginning of period	961	1,000
Recognized as revenue	(22)	(39)
Balance at end of period	939	961
Other Opioid Treatments
Movement in Deferred Revenue [Roll Forward]
Balance at beginning of period	1,600	1,600
Recognized as revenue	0	0
Balance at end of period	$ 1,600	$ 1,600