Fair Value Measurement - Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Mar. 31, 2022
Financial assets:
Other investments	$ 17,748	$ 19,820
Investments held in trust	276,592	276,016
Total financial assets	294,340	295,836
Financial liabilities:
Warrant liability	637	2,883
Secured financing	13,080	13,818
Total financial liabilities	13,717	16,701
Reported Value Measurement
Financial assets:
Other investments	10,673	10,853
Investments held in trust	276,000	276,000
Total financial assets	286,673	286,853
Level 1
Financial assets:
Other investments	4,668	6,002
Investments held in trust	276,592	276,016
Total financial assets	281,260	282,018
Financial liabilities:
Warrant liability	549	2,484
Secured financing	0	0
Total financial liabilities	549	2,484
Level 2
Financial assets:
Other investments	0	0
Investments held in trust	0	0
Total financial assets	0	0
Financial liabilities:
Warrant liability	88	399
Secured financing	0	0
Total financial liabilities	88	399
Level 3
Financial assets:
Other investments	13,080	13,818
Investments held in trust	0	0
Total financial assets	13,080	13,818
Financial liabilities:
Warrant liability	0	0
Secured financing	13,080	13,818
Total financial liabilities	$ 13,080	$ 13,818