Accrued Expenses (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Mar. 31, 2020
Payables and Accruals [Abstract]
Research and development expenses	$ 5,469	$ 6,951
Salaries, bonuses and other compensation expenses	1,540	2,521
Legal expenses	214	704
Other expenses	614	1,143
Total accrued expenses	$ 7,837	$ 11,319