Summary of Significant Accounting Policies - Additional Information (Details) $ in Thousands	12 Months Ended
	Mar. 31, 2021 USD ($) segment shares	Mar. 31, 2020 USD ($) segment shares	Mar. 31, 2019 USD ($) shares
Accounting Policies [Line Items]
Number of operating segments | segment	1	1
Maturity of time deposits	90 days
Cash, FDIC insured amount	$ 250
Cash and cash equivalents	73,295	$ 138,012
Cash, uninsured amount	86,317
Depreciation	7,997	8,172	$ 10,298
Advertising costs	$ 3,902	$ 6,044	$ 8,226
Employee Stock Options
Accounting Policies [Line Items]
Options excluded from the computation of diluted net income per share | shares	1,949	1,807	1,963
Minimum
Accounting Policies [Line Items]
Amortization period of intangible assets	5 years
Maximum
Accounting Policies [Line Items]
Amortization period of intangible assets	10 years
Computer Equipment and Software | Minimum
Accounting Policies [Line Items]
Useful life	3 years
Computer Equipment and Software | Maximum
Accounting Policies [Line Items]
Useful life	5 years
Furniture and Fixtures | Minimum
Accounting Policies [Line Items]
Useful life	3 years
Furniture and Fixtures | Maximum
Accounting Policies [Line Items]
Useful life	7 years
Leasehold Improvements
Accounting Policies [Line Items]
Useful life, description	lesser of lease term or estimated useful life of asset
Capitalized Software Costs
Accounting Policies [Line Items]
Useful life	3 years
Accounting Standards Update 2014-09
Accounting Policies [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]	true
Change in Accounting Principle, Accounting Standards Update, Adoption Date	Apr. 01, 2018
Accounting Standards Update 2016-02
Accounting Policies [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]	true
Change in Accounting Principle, Accounting Standards Update, Adoption Date	Apr. 01, 2019
Accounting Standards Update 2018-15
Accounting Policies [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]	true
Change in Accounting Principle, Accounting Standards Update, Adoption Date	Apr. 01, 2020
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]	true
Accounting Standards Update 2018-13
Accounting Policies [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]	true
Change in Accounting Principle, Accounting Standards Update, Adoption Date	Apr. 01, 2020
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]	true
Accounting Standards Update 2017-04
Accounting Policies [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]	true
Change in Accounting Principle, Accounting Standards Update, Adoption Date	Apr. 01, 2020
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]	true
Accounting Standards Update 2016-13
Accounting Policies [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]	true
Change in Accounting Principle, Accounting Standards Update, Adoption Date	Apr. 01, 2020
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]	true