Segment reporting (Details) - Schedule of financial information represents the operating results of the reportable segments - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2021	Jan. 31, 2020
Clinical Services [Member]
Segment Reporting Information [Line Items]
Revenues – Services and Products	$ 23,988	$ 12,513	$ 45,211	$ 25,293
Operating costs and expenses:
Cost of revenues	11,708	10,243	24,703	21,218
Capital expenditures	341	142	881	289
Research and development	160	373	281	723
Selling, general and administrative	6,425	5,895	12,523	12,110
Legal and related expenses	71	38	96	88
Total operating costs and expenses	18,364	16,549	37,603	34,139
Operating income (loss)	5,624	(4,036)	7,608	(8,846)
Other income (expense):
Interest	(4)	(10)	(10)	(22)
Other	14	16	29	19
Foreign exchange loss
Net income (loss)	5,634	(4,030)	7,627	(8,849)
Depreciation and amortization included above	381	392	790	801
Products [Member]
Segment Reporting Information [Line Items]
Revenues – Services and Products	7,478	6,871	14,910	14,298
Operating costs and expenses:
Cost of revenues	3,937	3,332	7,700	6,878
Capital expenditures	154	18	198	145
Research and development	633	503	1,225	1,019
Selling, general and administrative	2,593	2,530	5,038	5,287
Legal and related expenses	1	1	6	1
Total operating costs and expenses	7,164	6,366	13,969	13,185
Operating income (loss)	314	505	941	1,113
Other income (expense):
Interest	8	16	18	34
Other	2	7	4	(5)
Foreign exchange loss	625	79	461	270
Net income (loss)	949	607	1,424	1,412
Depreciation and amortization included above	188	253	373	503
Therapeutics [Member]
Segment Reporting Information [Line Items]
Revenues – Services and Products
Operating costs and expenses:
Cost of revenues
Capital expenditures
Research and development	13	189	46	377
Selling, general and administrative	16		33
Legal and related expenses
Total operating costs and expenses	29	189	79	377
Operating income (loss)	(29)	(189)	(79)	(377)
Other income (expense):
Interest
Other
Foreign exchange loss
Net income (loss)	(29)	(189)	(79)	(377)
Depreciation and amortization included above
Other [Member]
Segment Reporting Information [Line Items]
Revenues – Services and Products
Operating costs and expenses:
Cost of revenues
Capital expenditures	11		44
Research and development
Selling, general and administrative	1,979	2,268	3,433	4,435
Legal and related expenses	2,220	2,021	2,830	3,667
Total operating costs and expenses	4,199	4,289	6,263	8,102
Operating income (loss)	(4,199)	(4,289)	(6,263)	(8,102)
Other income (expense):
Interest	(53)	165	(108)	396
Other		49		185
Foreign exchange loss
Net income (loss)	(4,252)	(4,075)	(6,371)	(7,521)
Depreciation and amortization included above	66	65	132	130
Consolidated [Member]
Segment Reporting Information [Line Items]
Revenues – Services and Products	31,466	19,384	60,121	39,591
Operating costs and expenses:
Cost of revenues	15,645	13,575	32,403	28,096
Capital expenditures	506	160	1,123	434
Research and development	806	1,065	1,552	2,119
Selling, general and administrative	11,013	10,693	21,027	21,832
Legal and related expenses	2,292	2,060	2,932	3,756
Total operating costs and expenses	29,756	27,393	57,914	55,803
Operating income (loss)	1,710	(8,009)	2,207	(16,212)
Other income (expense):
Interest	(49)	171	(100)	408
Other	16	72	33	199
Foreign exchange loss	625	79	461	270
Net income (loss)	2,302	(7,687)	2,601	(15,335)
Depreciation and amortization included above	635	710	1,295	1,434
Selling, General and Administrative Expenses [Member] | Clinical Services [Member]
Operating costs and expenses:
Selling, general and administrative	10	33	19	67
Selling, General and Administrative Expenses [Member] | Products [Member]
Operating costs and expenses:
Selling, general and administrative	16	22	32	44
Selling, General and Administrative Expenses [Member] | Therapeutics [Member]
Operating costs and expenses:
Selling, general and administrative
Selling, General and Administrative Expenses [Member] | Other [Member]
Operating costs and expenses:
Selling, general and administrative	136	247	265	410
Selling, General and Administrative Expenses [Member] | Consolidated [Member]
Operating costs and expenses:
Selling, general and administrative	162	302	316	521
Cost of Revenues [Member] | Clinical Services [Member]
Operating costs and expenses:
Cost of revenues	14		27
Cost of Revenues [Member] | Products [Member]
Operating costs and expenses:
Cost of revenues
Cost of Revenues [Member] | Therapeutics [Member]
Operating costs and expenses:
Cost of revenues
Cost of Revenues [Member] | Other [Member]
Operating costs and expenses:
Cost of revenues
Cost of Revenues [Member] | Consolidated [Member]
Operating costs and expenses:
Cost of revenues	14		27
Total [Member] | Clinical Services [Member]
Operating costs and expenses:
Total	24	33	46	67
Total [Member] | Products [Member]
Operating costs and expenses:
Total	16	22	32	44
Total [Member] | Therapeutics [Member]
Operating costs and expenses:
Total
Total [Member] | Other [Member]
Operating costs and expenses:
Total	136	247	265	410
Total [Member] | Consolidated [Member]
Operating costs and expenses:
Total	$ 176	$ 302	$ 343	$ 521