Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Mar. 31, 2021
Deferred tax assets:
Accrued expenses	$ 2,568	$ 3,429
Depreciation and amortization	5,657	3,518
Capitalized research and development	24,050	0
Net operating loss and other attribute carryforwards	196,159	178,535
Stock based compensation	20,695	14,987
Research and development credits	31,695	25,932
Lease liability	13,349	15,208
Convertible debt	3,638	0
Other	4,530	378
Gross deferred tax assets	302,341	241,987
Valuation allowance	(276,475)	(198,794)
Total deferred tax assets	25,866	43,193
Deferred tax liabilities:
Prepaids	(4,268)	(3,949)
Intangibles	(2,679)	(1,923)
Capitalized research and development	0	(4,405)
Deferred contract acquisition costs	(7,326)	(15,520)
Convertible debt	0	(3,991)
Right of use asset	(10,809)	(12,748)
Total deferred tax liabilities	(25,082)	(42,536)
Total net deferred tax assets/(liabilities)	$ 784	$ 657