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Acquisitions (Details)
$ in Thousands
12 Months Ended
Aug. 01, 2018
USD ($)
item
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2020
Acquisitions        
Increase in accrued expenses and other liabilities   $ 566    
Decrease of goodwill   1,061    
Backlog - held for sale        
Acquisitions        
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles   750    
Backlog        
Acquisitions        
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles   (48)    
Elauwit Networks, LLC        
Acquisitions        
Consideration for acquisition of assets before contingent consideration $ 28,000      
Total purchase price 28,612      
Contingent consideration fair value 961      
Cash paid 15,576      
Purchase price held back 11,000      
Indemnification holdback retained for 12 months $ 2,000      
Payment of indemnification holdback   1,075    
Identification holdback amount retained   925    
Indemnification holdback period 12 months      
Payment for amounts held back for third-party consents   1,952 $ 9,048  
Business Combination, Contingent Consideration, Liability, Valuation Technique [Extensible List] wifi:MonteCarloMethodMember      
Increase in accrued expenses and other liabilities   566    
Elauwit Networks, LLC | Costs and operating expenses        
Acquisitions        
Increase in accrued expenses and other liabilities   $ 566    
Elauwit Networks, LLC | Risk-free rate        
Acquisitions        
Contingent consideration valuation input | item 2.78      
Elauwit Networks, LLC | Revenue volatility rate        
Acquisitions        
Contingent consideration valuation input | item 40      
Elauwit Networks, LLC | Relief from royalty method | Royalty rate        
Acquisitions        
Identifiable intangible assets valuation input | item 1.0      
Elauwit Networks, LLC | Minimum | Excess earnings, relief from royalty, and loss-of-revenue methods | Discount rates        
Acquisitions        
Identifiable intangible assets valuation input | item 8.0      
Elauwit Networks, LLC | Maximum | Excess earnings, relief from royalty, and loss-of-revenue methods | Discount rates        
Acquisitions        
Identifiable intangible assets valuation input | item 21.0      
Elauwit Networks, LLC | Backlog | Fair value less costs | Discount rates        
Acquisitions        
Identifiable intangible assets valuation input       8