Summary of Significant Accounting Policies - Geographic Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Geographic revenue information
Total Revenue	$ 83,412	$ 82,837
Total North America
Geographic revenue information
Total Revenue	51,276	41,265
United States
Geographic revenue information
Total Revenue	45,480	39,100
Mexico
Geographic revenue information
Total Revenue	5,005	2,007
All other North America
Geographic revenue information
Total Revenue	791	158
Total Europe
Geographic revenue information
Total Revenue	16,062	15,586
Russia
Geographic revenue information
Total Revenue	3,176	2,824
All other Europe
Geographic revenue information
Total Revenue	12,886	12,762
Asia
Geographic revenue information
Total Revenue	5,229	8,378
Australia
Geographic revenue information
Total Revenue	3,874	5,443
All other
Geographic revenue information
Total Revenue	$ 6,971	$ 12,165