Revenues - Capitalized costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Capitalized costs to fulfill
Beginning balance	$ 4,299	$ 4,278
Costs capitalized	391	2,382
Amortization expense	(2,251)	(2,248)
Foreign currency translation adjustments	(158)	(113)
Ending balance	$ 2,281	$ 4,299