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Revenue Recognition - Schedule of Unamortized Installation Cost and Sales Commissions (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Balance at January 1, 2020 $ 274 $ 424
Incremental costs deferred 128 513
Deferred costs recognized (250) (663)
Balance at June 30, 2020 152 274
Installation Cost [Member]    
Balance at January 1, 2020 187  
Incremental costs deferred 74  
Deferred costs recognized (157)  
Balance at June 30, 2020 104 187
Sales Commissions [Member]    
Balance at January 1, 2020 87  
Incremental costs deferred 54  
Deferred costs recognized (93)  
Balance at June 30, 2020 $ 48 $ 87