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Revenue Recognition (Tables)
 3 Months Ended
Mar. 31, 2021
Revenue Recognition [Abstract]  
Disaggregation of Revenue
    Three months ended March 31, 2021  
    Services Revenues     Products Revenue     Total Revenue  
Timing of revenue recognition:                  
Products and services transferred over time   $ 2,028,000     $ -     $ 2,028,000  
Products and services transferred at a point in time     3,391,000       -       3,391,000  
Total   $ 5,419,000     $ -     $ 5,419,000  

 

    Three months ended March 31, 2020  
    Services Revenues     Products Revenue     Total Revenue  
Timing of revenue recognition:                  
Products and services transferred over time   $ 3,344,000     $ -     $ 3,344,000  
Products and services transferred at a point in time     1,092,000       246,000       1,338,000  
Total   $ 4,436,000     $ 246,000     $ 4,682,000  

 
Schedule of Changes in Deferred Revenue
Balance at December 31, 2020   $ 180,000  
Reclassification of beginning deferred revenue to revenue, as a result of performance obligations satisfied     ( 132,000 )
Cash received in advance and not recognized as revenue     652,000  
Balance at March 31, 2021   $ 700,000