Certain Balance Sheet Components - Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Mar. 31, 2021
Other Liabilities Disclosure [Abstract]
Accrued compensation-related expenses	$ 22,201	$ 20,571
Accrued sales discounts, rebates, and allowances	15,549	1,315
Accrued R&D expenses	6,463	8,544
Accrued commercial expenses	8,309	7,770
Accrued other expenses	5,259	5,315
Accrued professional fees	642	935
Deferred product revenue	0	162
Total accrued expenses and other current liabilities	$ 58,423	$ 44,612