Summary of Significant Accounting Policies - Geographic Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Geographic revenue information
Total Revenue	$ 85,211	$ 115,461	$ 133,105
United States
Geographic revenue information
Total Revenue	36,667	48,890	58,432
Mexico
Geographic revenue information
Total Revenue	11,598	14,468	8,956
All other North America
Geographic revenue information
Total Revenue	318	331	196
Total North America
Geographic revenue information
Total Revenue	48,583	63,689	67,584
Russia
Geographic revenue information
Total Revenue	1,828	12,978	23,216
All other Europe
Geographic revenue information
Total Revenue	14,513	15,707	17,820
Total Europe
Geographic revenue information
Total Revenue	16,341	28,685	41,036
Asia
Geographic revenue information
Total Revenue	7,643	9,257	10,728
Australia
Geographic revenue information
Total Revenue	8,557	8,832	5,275
All other
Geographic revenue information
Total Revenue	$ 4,087	$ 4,998	$ 8,482