Geographical Information - Long-lived Assets By Geographic Region (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Mar. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Non-current Assets	$ 19,997	$ 29,428
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Non-current Assets	5,197	4,393
Foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Non-current Assets	14,800	25,035
Australia
Revenues from External Customers and Long-Lived Assets [Line Items]
Non-current Assets	5	5
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Non-current Assets	51	0
Estonia
Revenues from External Customers and Long-Lived Assets [Line Items]
Non-current Assets	7,930	0
Mexico
Revenues from External Customers and Long-Lived Assets [Line Items]
Non-current Assets	1,845	2,681
Netherlands
Revenues from External Customers and Long-Lived Assets [Line Items]
Non-current Assets	4,969	5,541
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Non-current Assets	$ 0	$ 16,808