Income Taxes - Significant Components of the Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Mar. 31, 2022
Deferred tax assets
Intangible assets	$ 8,112	$ 6,726
Net operating losses	64,418	40,297
Stock-based compensation	7,120	5,581
Research and development credits	10,798	6,010
Lease liability	260	501
Others	1,782	219
Total deferred tax assets	92,490	59,334
Valuation allowance	(91,988)	(58,704)
Deferred tax assets, net of valuation allowance	502	630
Deferred tax liabilities
Depreciation	(69)	(69)
Right-of-use assets	(250)	(489)
Others	(183)	(72)
Total deferred tax liabilities	(502)	(630)
Total net deferred taxes	$ 0	$ 0