Income Taxes - Deferred Taxes (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Mar. 31, 2021
Deferred tax assets:
Research tax credits	$ 7,345	$ 9,967
Net operating losses	135,916	119,701
Share-based compensation	11,418	12,649
Intangibles	79,231	58,830
Lease liability	2,009	2,317
Other	10,536	7,080
Subtotal	246,455	210,544
Valuation allowance	(244,188)	(207,858)
Deferred tax assets, net of valuation allowance	2,267	2,686
Deferred tax liabilities:
Depreciation	(526)	(651)
Right-of-use assets	(1,741)	(2,035)
Net deferred tax assets	$ 0	$ 0