Restructuring Plan - Additional Information (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended					12 Months Ended
	Jun. 30, 2019	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Restructuring Cost And Reserve [Line Items]
Restructuring costs		$ 77	$ 546	$ 175	$ 1,707	$ 640	$ 2,505	$ 640	$ 611
Restructuring and related cost, expected cost						$ 1,762		$ 1,762
Lease Right of Use Assets and Property Plant and Equipment
Restructuring Cost And Reserve [Line Items]
Other asset impairment charges							$ 9,373
Research and Development Costs
Restructuring Cost And Reserve [Line Items]
Restructuring plan, percentage of number of positions eliminated	4.00%