Annual report pursuant to Section 13 and 15(d)

Income Taxes - Additional Information (Detail)

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Income Taxes - Additional Information (Detail) - USD ($)
12 Months Ended
Mar. 31, 2024
Mar. 31, 2021
Mar. 31, 2023
Income Taxes [Line Items]      
Deferred income tax asset $ 2,983,000   $ 2,798,000
Valuation allowance 5,241,000   5,277,000
Liability unrecognized tax benefits 0   $ 0
Investment Tax Credit Carryforward [Member]      
Income Taxes [Line Items]      
Deferred income taxes include the impact of state investment tax credits 236,000    
State investment tax credits with an unlimited carryforward period $ 794,000    
International Tax Jurisdictions [Member] | Earliest Tax Year [Member] | State Administration of Taxation, China [Member]      
Income Taxes [Line Items]      
Open tax year 2020    
International Tax Jurisdictions [Member] | Earliest Tax Year [Member] | Ministry of Finance, India [Member]      
Income Taxes [Line Items]      
Open tax year 2018    
International Tax Jurisdictions [Member] | Latest Tax Year [Member] | State Administration of Taxation, China [Member]      
Income Taxes [Line Items]      
Open tax year 2023    
International Tax Jurisdictions [Member] | Latest Tax Year [Member] | Ministry of Finance, India [Member]      
Income Taxes [Line Items]      
Open tax year 2022    
Federal Tax Jurisdictions [Member] | Earliest Tax Year [Member]      
Income Taxes [Line Items]      
Open tax year 2020    
Federal Tax Jurisdictions [Member] | Latest Tax Year [Member]      
Income Taxes [Line Items]      
Open tax year 2023    
State Tax Jurisdictions [Member] | Earliest Tax Year [Member]      
Income Taxes [Line Items]      
Open tax year 2019    
State Tax Jurisdictions [Member] | Latest Tax Year [Member]      
Income Taxes [Line Items]      
Open tax year 2023    
Maximum [Member] | Investment Tax Credit Carryforward [Member]      
Income Taxes [Line Items]      
Expiration date of state investment tax credits   Mar. 31, 2035  
Minimum [Member] | Investment Tax Credit Carryforward [Member]      
Income Taxes [Line Items]      
Expiration date of state investment tax credits   Mar. 31, 2022