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Goodwill - Additional Information (Detail) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Goodwill [Line Items]    
Goodwill $ 7,000,000.0 $ 7,000,000.0
Impairment of goodwill 0  
Network Solutions [Member]    
Goodwill [Line Items]    
Goodwill 6,600,000 400,000
Services & Support [Member]    
Goodwill [Line Items]    
Goodwill $ 6,600,000 $ 400,000