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Summary of Significant Accounting Policies - Valuation Allowance (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Change in Valuation Allowance [Roll Forward]    
Balance at beginning of the year $ 89,742 $ 85,984
Charged to costs and expenses 325 842
Changes in net loss carryforward and other 211 2,916
Balance at end of the year $ 90,278 $ 89,742