Annual report pursuant to Section 13 and 15(d)

Income Taxes - Additional Information (Detail)

v3.7.0.1
Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Income Taxes [Line Items]    
Valuation allowance $ 959 $ 985
Liability unrecognized tax benefits $ 0 $ 0
Earliest Tax Year [Member] | Federal Tax Jurisdictions [Member]    
Income Taxes [Line Items]    
Open tax year 2014  
Earliest Tax Year [Member] | State Tax Jurisdictions [Member]    
Income Taxes [Line Items]    
Open tax year 2012  
Earliest Tax Year [Member] | International Tax Jurisdictions [Member]    
Income Taxes [Line Items]    
Open tax year 2013  
Latest Tax Year [Member] | Federal Tax Jurisdictions [Member]    
Income Taxes [Line Items]    
Open tax year 2016  
Latest Tax Year [Member] | State Tax Jurisdictions [Member]    
Income Taxes [Line Items]    
Open tax year 2016  
Latest Tax Year [Member] | International Tax Jurisdictions [Member]    
Income Taxes [Line Items]    
Open tax year 2016  
Other Assets [Member]    
Income Taxes [Line Items]    
Deferred income tax asset foreign $ 25  
Investment Tax Credit Carryforward [Member]    
Income Taxes [Line Items]    
Deferred income taxes include the impact of state investment tax credits 305  
State investment tax credits with an unlimited carryforward period $ 654  
Investment Tax Credit Carryforward [Member] | Maximum [Member]    
Income Taxes [Line Items]    
Expiration date of state investment tax credits Mar. 31, 2031  
Investment Tax Credit Carryforward [Member] | Minimum [Member]    
Income Taxes [Line Items]    
Expiration date of state investment tax credits Mar. 31, 2017