Accrued Expenses (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Mar. 31, 2020
Payables and Accruals [Abstract]
Research and development expenses	$ 6,789	$ 6,951
Salaries, bonuses and other compensation expenses	1,142	2,521
Legal expenses	335	704
Other expenses	683	1,143
Total accrued expenses	$ 8,949	$ 11,319