Income Taxes - Additional Information (Details) - USD ($)	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Operating Loss Carryforwards [Line Items]
Foreign withholding related taxes	$ 3,400,000
Unrecognized tax benefits, decrease resulting from prior period tax positions	234,000
Liability for unrecognized tax benefits	4,426,000	$ 4,192,000	$ 2,894,000
Income tax examination, interest accrued	88,000	174,000
Income tax examination, interest income	85,000	35,000
Income tax examination, interest expense			19,000
Income tax examination, penalty accrued	0	0	0
Income tax examination, penalty expense	$ 0	0	$ 0
Period within which the company does not anticipate total unrecognized tax benefits to change	within the next twelve months
Research and Development
Operating Loss Carryforwards [Line Items]
Tax credit carryforward, amount	$ 8,574,000	12,399,000
Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	18,748,000	$ 24,216,000
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	3,715,000
Tax effect from change in tax rate	$ 600,000