Income Taxes - Additional Information (Details) - USD ($)	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Operating Loss Carryforwards [Line Items]
Foreign withholding related taxes	$ 2,600,000
Unrecognized tax benefits, decrease resulting from prior period tax positions	1,298,000
Liability for unrecognized tax benefits	4,192,000	$ 2,894,000	$ 2,419,000
Income tax examination, interest accrued	174,000	209,000
Income tax examination, interest income	35,000
Income tax examination, interest expense		19,000	86,000
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	$ 12,399,000	11,072,000
Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	24,216,000	$ 17,419,000
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	3,727,000
Tax effect from change in tax rate	$ 500,000