Annual report pursuant to Section 13 and 15(d)

Income Taxes - Additional Information (Detail)

v3.8.0.1
Income Taxes - Additional Information (Detail) - USD ($)
9 Months Ended 12 Months Ended
Dec. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Income Taxes [Line Items]      
Valuation allowance   $ 1,074,000 $ 959,000
Liability unrecognized tax benefits   $ 0 0
Percentage of corporate income tax rate 35.00% 21.00%  
Income tax benefit from remeasurement of deferred tax assets and liabilities   $ 971,000  
One-time transition tax on accumulated foreign earnings   $ 185,000  
Earliest Tax Year [Member] | Federal Tax Jurisdictions [Member]      
Income Taxes [Line Items]      
Open tax year   2015  
Earliest Tax Year [Member] | State Tax Jurisdictions [Member]      
Income Taxes [Line Items]      
Open tax year   2013  
Earliest Tax Year [Member] | International Tax Jurisdictions [Member]      
Income Taxes [Line Items]      
Open tax year   2014  
Latest Tax Year [Member] | Federal Tax Jurisdictions [Member]      
Income Taxes [Line Items]      
Open tax year   2017  
Latest Tax Year [Member] | State Tax Jurisdictions [Member]      
Income Taxes [Line Items]      
Open tax year   2017  
Latest Tax Year [Member] | International Tax Jurisdictions [Member]      
Income Taxes [Line Items]      
Open tax year   2017  
Other Assets [Member]      
Income Taxes [Line Items]      
Deferred income tax asset foreign   $ 15,000 $ 25,000
Investment Tax Credit Carryforward [Member]      
Income Taxes [Line Items]      
Deferred income taxes include the impact of state investment tax credits   279,000  
State investment tax credits with an unlimited carryforward period   $ 795,000  
Investment Tax Credit Carryforward [Member] | Maximum [Member]      
Income Taxes [Line Items]      
Expiration date of state investment tax credits   Mar. 31, 2032  
Investment Tax Credit Carryforward [Member] | Minimum [Member]      
Income Taxes [Line Items]      
Expiration date of state investment tax credits   Mar. 31, 2019