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Contractual Payment Obligation - Additional Information (Detail) - USD ($)
3 Months Ended 12 Months Ended
Apr. 13, 2020
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2012
Related Party Transaction [Line Items]        
Interest accreted on contractual payment obligation   $ 32,000 $ 44,000  
Secure Keyboards Ltd        
Related Party Transaction [Line Items]        
Percentage of ownership by a related party following acquisition   24.50%   30.00%
Secure Networks Ltd        
Related Party Transaction [Line Items]        
Percentage of ownership by a related party following acquisition       9.00%
Settlement Agreement | Subsequent Event        
Related Party Transaction [Line Items]        
Amended installment payment, contractual payment period Oct. 31, 2021      
Increase in contractual payment obligation $ 90,000,000      
Settlement Agreement | Maximum        
Related Party Transaction [Line Items]        
Installment payment, contractual payment year   2021