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Revenue Recognition (Tables)
 12 Months Ended
Dec. 31, 2020
Revenue Recognition [Abstract]  
Disaggregation of revenue
    Year ended December 31, 2020  
    Services Revenues     Products Revenue     Total Revenue  
Timing of revenue recognition:                  
Products and services transferred over time   $ 10,670,000     $ -     $ 10,670,000  
Products and services transferred at a point in time     6,234,000       578,000       6,812,000  
Total   $ 16,904,000     $ 578,000     $ 17,482,000  

 

    Year ended December 31, 2019  
    Services Revenues     Products Revenue     Total Revenue  
Timing of revenue recognition:                  
Products and services transferred over time   $ 15,029,000     $ -     $ 15,029,000  
Products and services transferred at a point in time     4,774,000       1,725,000       6,499,000  
Total   $ 19,803,000     $ 1,725,000     $ 21,528,000  

 
Deferred revenue
Balance at December 31, 2019   $ 140,000  
Reclassification of beginning deferred revenue to revenue, as a result of performance obligations satisfied     (140,000 )
Cash received in advance and not recognized as revenue     180,000  
Balance at December 31, 2020   $ 180,000