Segment reporting (Details) - Schedule of Segment Reporting Information, by Segment - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2020	Apr. 30, 2019
Clinical Services [Member]
Segment Reporting Information [Line Items]
Revenues – Services and Products	$ 9,739		$ 35,032
Grant income	747		747
Total	10,486		35,779
Cost of revenues	9,133	$ 10,963	30,351	$ 32,956
Research and development	395	31	1,118	31
Selling, general and administrative	5,902	5,960	18,012	18,220
Legal fee expense		35		109
Total operating costs, expenses and legal settlements, net		16,989		51,316
Legal and related expenses	52		140
Total operating costs and expenses	15,482		49,621
Operating income (loss)	(4,996)	(5,238)	(13,842)	(13,268)
Interest	(7)	(18)	(29)	(51)
Other	1	6	20	17
Foreign exchange loss
Income (loss) before income taxes	(5,002)	(5,250)	(13,851)	(13,302)
Depreciation and amortization included above	373	440	1,174	1,217
Selling, general and administrative	21	40	88	118
Total	21	40	88	118
Total	21	40	88	118
Capital expenditures	225	120	514	883
Revenues		11,751		38,048
Products [Member]
Segment Reporting Information [Line Items]
Revenues – Services and Products	6,417		20,715
Total	6,417		20,715
Cost of revenues	3,345	3,397	10,223	10,391
Research and development	580	527	1,599	1,645
Selling, general and administrative	2,667	2,923	7,954	8,828
Legal fee expense		16		24
Legal settlements, net		(28,925)		(28,925)
Total operating costs, expenses and legal settlements, net		(22,062)		(8,037)
Legal and related expenses			1
Total operating costs and expenses	6,592		19,777
Operating income (loss)	(175)	29,973	938	30,238
Interest	11	19	45	49
Other	4		(1)
Foreign exchange loss	(358)	(332)	(88)	(530)
Income (loss) before income taxes	(518)	29,660	894	29,757
Depreciation and amortization included above	278	340	781	1,025
Selling, general and administrative	14	24	58	74
Total	14	24	58	74
Total	14	24	58	74
Capital expenditures	60	446	205	524
Revenues		7,911		22,201
Other [Member]
Segment Reporting Information [Line Items]
Revenues – Services and Products
Grant income
Total
Cost of revenues
Selling, general and administrative	2,492	2,037	6,927	6,339
Legal fee expense		206		2,567
Legal settlements, net
Total operating costs, expenses and legal settlements, net		2,243		8,906
Legal and related expenses	1,873		5,540
Total operating costs and expenses	4,365		12,467
Operating income (loss)	(4,365)	(2,243)	(12,467)	(8,906)
Interest	83	257	479	761
Other	130	64	315	232
Foreign exchange loss
Income (loss) before income taxes	(4,152)	(1,922)	(11,673)	(7,913)
Depreciation and amortization included above	66	58	196	130
Selling, general and administrative	172	135	582	553
Total	172	135	582	553
Total	172	135	582	553
Capital expenditures				6,147
Revenues
Consolidated [Member]
Segment Reporting Information [Line Items]
Revenues – Services and Products	16,156		55,747
Grant income	747		747
Total	16,903		56,494
Cost of revenues	12,478	14,360	40,574	43,347
Research and development	1,163	781	3,282	2,344
Selling, general and administrative	11,061	10,920	32,893	33,387
Legal fee expense		257		2,700
Legal settlements, net		(28,925)		(28,925)
Total operating costs, expenses and legal settlements, net		(2,607)		52,853
Legal and related expenses	1,925		5,681
Total operating costs and expenses	26,627		82,430
Operating income (loss)	(9,724)	22,269	(25,936)	7,396
Interest	87	258	495	759
Other	135	70	334	249
Foreign exchange loss	(358)	(332)	(88)	(530)
Income (loss) before income taxes	(9,860)	22,265	(25,195)	7,874
Depreciation and amortization included above	717	838	2,151	2,372
Selling, general and administrative	207	199	728	725
Total	207	199	728	725
Total	207	199	728	725
Capital expenditures	285	566	719	7,554
Revenues		19,662		60,249
Therapeutics [Member]
Segment Reporting Information [Line Items]
Grant income
Research and development	188	223	565	668
Total operating costs, expenses and legal settlements, net		223		668
Legal and related expenses
Total operating costs and expenses	188		565
Operating income (loss)	(188)	(223)	(565)	(668)
Other
Income (loss) before income taxes	$ (188)	$ (223)	$ (565)	$ (668)