Segment information - Schedule of Segment Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Total revenue	$ 143,294	$ 126,894	$ 145,650
Segment Adjusted EBITDA	44,772	48,811	53,298
Subscription
Segment Reporting Information [Line Items]
Total revenue	123,573	113,351	127,570
Hardware and other
Segment Reporting Information [Line Items]
Total revenue	19,721	13,543	18,080
Total Regional Sales Offices
Segment Reporting Information [Line Items]
Total revenue	143,212	126,809	145,237
Segment Adjusted EBITDA	54,940	56,364	62,473
Total Regional Sales Offices | Subscription
Segment Reporting Information [Line Items]
Total revenue	123,526	113,282	127,460
Total Regional Sales Offices | Hardware and other
Segment Reporting Information [Line Items]
Total revenue	19,686	13,527	17,777
Africa
Segment Reporting Information [Line Items]
Total revenue	83,176	67,948	76,756
Segment Adjusted EBITDA	36,467	31,781	33,103
Africa | Subscription
Segment Reporting Information [Line Items]
Total revenue	74,778	62,453	70,886
Africa | Hardware and other
Segment Reporting Information [Line Items]
Total revenue	8,398	5,495	5,870
Europe
Segment Reporting Information [Line Items]
Total revenue	17,254	14,579	15,027
Segment Adjusted EBITDA	6,337	6,260	5,603
Europe | Subscription
Segment Reporting Information [Line Items]
Total revenue	13,509	12,138	11,682
Europe | Hardware and other
Segment Reporting Information [Line Items]
Total revenue	3,745	2,441	3,345
Americas
Segment Reporting Information [Line Items]
Total revenue	15,574	18,981	24,529
Segment Adjusted EBITDA	842	7,077	10,370
Americas | Subscription
Segment Reporting Information [Line Items]
Total revenue	14,036	18,211	22,322
Americas | Hardware and other
Segment Reporting Information [Line Items]
Total revenue	1,538	770	2,207
Middle East and Australasia
Segment Reporting Information [Line Items]
Total revenue	22,554	21,237	23,130
Segment Adjusted EBITDA	10,034	9,751	11,031
Middle East and Australasia | Subscription
Segment Reporting Information [Line Items]
Total revenue	16,950	16,558	17,389
Middle East and Australasia | Hardware and other
Segment Reporting Information [Line Items]
Total revenue	5,604	4,679	5,741
Brazil
Segment Reporting Information [Line Items]
Total revenue	4,654	4,064	5,795
Segment Adjusted EBITDA	1,260	1,495	2,366
Brazil | Subscription
Segment Reporting Information [Line Items]
Total revenue	4,253	3,922	5,181
Brazil | Hardware and other
Segment Reporting Information [Line Items]
Total revenue	401	142	614
Central Services Organization
Segment Reporting Information [Line Items]
Total revenue	82	85	413
Segment Adjusted EBITDA	(10,168)	(7,553)	(9,175)
Central Services Organization | Subscription
Segment Reporting Information [Line Items]
Total revenue	47	69	110
Central Services Organization | Hardware and other
Segment Reporting Information [Line Items]
Total revenue	35	16	303
South African-Based Segments
Segment Reporting Information [Line Items]
Total revenue	82,300	67,100	76,000
Foreign-Based Segments
Segment Reporting Information [Line Items]
Total revenue	$ 61,000	$ 59,800	$ 69,700