Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Feb. 29, 2016
Summary Of Significant Accounting Policies [Line Items]
Loyalty liability	$ 417
Right-of-use assets	62,466		20,757	$ 5,580	$ 5,580
Lease liability	53,454		21,948	$ 5,897	5,897
Deficit	$ (250,548)		$ (203,497)		$ 317
Accounting Standards Update No. 2016-02
Summary Of Significant Accounting Policies [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adopted				true
Deficit				$ 317
Accounting Standards Update No. 2016-13
Summary Of Significant Accounting Policies [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adoption Date	Jan. 01, 2020
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect	true
Accounting Standards Update No. 2017-04
Summary Of Significant Accounting Policies [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adopted		true
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect		true
Accounting Standards Update No. 2018-13
Summary Of Significant Accounting Policies [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adopted		true
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect		true