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Nature of Business and Summary of Significant Accounting Policies (Tables)
9 Months Ended
Sep. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Contract Liabilities

Total contract liabilities consist of the following:

 

   

September 30,

2019

   

December 31,

2018

 
Contract liabilities, current   $ 1,698,560     $ 1,748,789  
Contract liabilities, non-current     1,830,471       1,991,091  
Total contract liabilities   $ 3,529,031     $ 3,739,880  

Schedule of Revenues

Revenues for nine month ended September 30, 2019 and 2018 were derived from the following sources

 

    Nine months ended September 30,  
    2019     2018  
DVM-800   $ 2,964,862     $ 3,956,816  
DVM-250 Plus     844,140       617,705  
FirstVu HD     1,019,287       1,070,245  
EVO     186,369        
DVM-100 & DVM-400     7,140       69,496  
DVM-750     115,589       378,660  
VuLink     113,894       146,896  
Repair and service     386,806       288,073  
Cloud service revenue     543,999       500,305  
Other service revenue     1,050,677       805,068  
Laser Ally     19,130       79,155  
Accessories and other revenues     769,034       1,000,703  
    $ 8,020,927     $ 8,913,122  

Summary of Sales by Geographic Area

For the three and nine months ended September 30, 2019 and 2018, sales by geographic area were as follows:

 

    Three Months Ended
September 30,
    Nine Months Ended
September 30,
 
    2019      2018      2019      2018   
Sales by geographic area:                                
United States of America   $ 2,854,501     $ 2,787,618     $ 7,846,560     $ 8,612,552  
Foreign     68,647       90,441       174,367       300,570  
    $ 2,923,148     $ 2,878,059     $ 8,020,927     $ 8,913,122