Fair Value Measurement - Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Mar. 31, 2021
Financial assets:
Other investments	$ 22,767	$ 17,381
Investments held in trust	276,009	276,003
Total financial assets	298,776	293,384
Financial liabilities:
Warrant liability	6,302	7,368
Secured financing	16,477	17,381
Total financial liabilities	22,779	24,749
Reported Value Measurement
Financial assets:
Other investments	11,369	9,902
Investments held in trust	276,000	276,000
Total financial assets	287,369	285,902
Level 1
Financial assets:
Other investments	6,290	0
Investments held in trust	276,009	276,003
Total financial assets	282,299	276,003
Financial liabilities:
Warrant liability	5,429	6,348
Secured financing	0	0
Total financial liabilities	5,429	6,348
Level 2
Financial assets:
Other investments	0	4,083
Investments held in trust	0	0
Total financial assets	0	4,083
Financial liabilities:
Warrant liability	873	1,020
Secured financing	0	4,083
Total financial liabilities	873	5,103
Level 3
Financial assets:
Other investments	16,477	13,298
Investments held in trust	0	0
Total financial assets	16,477	13,298
Financial liabilities:
Warrant liability	0	0
Secured financing	16,477	13,298
Total financial liabilities	$ 16,477	$ 13,298