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Leases - Additional Information (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Leased right-of-use assets $ 2,840,000   $ 2,840,000   $ 0
Operating lease liability $ 3,138,000   $ 3,138,000    
Lessee operating lease description     The practical expedients allowed the Company to not reassess (i) whether expired or existing contracts contained leases, (ii) lease classification for expired or existing leases and (iii) previously capitalized initial direct costs.    
Operating lease option to extend     5 years    
Operating lease weighted average discount rate percent 3.50%   3.50%    
Operating lease weighted average remaining lease term 3 years 10 months 24 days   3 years 10 months 24 days    
Right-of-use asset obtained in exchange for operating lease liability     $ 0    
Operating lease cost $ 300,000 $ 300,000 1,000,000.0 $ 800,000  
Short-term leases expense $ 43,000   $ 75,000    
Short-term lessee operating lease term of contract     twelve months or less    
Maximum [Member]          
Operating lease term of contract 7 years   7 years    
Minimum [Member]          
Operating lease term of contract 2 years   2 years    
NimbeLink [Member]          
Leased right-of-use assets $ 400,000   $ 400,000    
Operating lease liability 400,000   $ 400,000    
Office Warehouse And Test House Member          
Lease Expiration Date     Dec. 31, 2025    
ASC 842 [Member]          
Leased right-of-use assets 3,200,000   $ 3,200,000    
Operating lease liability $ 3,500,000   $ 3,500,000