Summary of Significant Accounting Policies - Segment Reporting - Geographic Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Geographic revenue information
Total Revenue	$ 67,636	$ 68,926
Total North America
Geographic revenue information
Total Revenue	36,754	34,588
United States
Geographic revenue information
Total Revenue	32,502	31,082
Mexico
Geographic revenue information
Total Revenue	3,931	2,361
All other North America
Geographic revenue information
Total Revenue	321	1,145
Total Europe
Geographic revenue information
Total Revenue	17,236	16,511
Russia
Geographic revenue information
Total Revenue	3,577	3,653
All other Europe
Geographic revenue information
Total Revenue	13,659	12,858
Asia
Geographic revenue information
Total Revenue	6,087	4,074
Australia
Geographic revenue information
Total Revenue	3,165	4,559
All other
Geographic revenue information
Total Revenue	$ 4,394	$ 9,194