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

Total contract liabilities consist of the following:

 

   June 30, 2019   December 31, 2018 
Contract liabilities, current  $1,794,457   $1,748,789 
Contract liabilities, non-current   1,864,989    1,991,091 
           
Total contract liabilities  $3,659,446   $3,739,880 
Schedule of Revenues

Revenues for six month ended June 30, 2019 and 2018 were derived from the following sources

 

   Six months ended June 30, 
   2019   2018 
DVM-800  $1,979,681   $2,860,907 
DVM-250 Plus   427,343    366,351 
FirstVu HD   735,222    642,665 
EVO   62,942     
DVM-100 & DVM-400   6,765    64,401 
DVM-750   72,549    213,935 
VuLink   73,919    133,001 
Repair and service   734,332    627,874 
Cloud service revenue   349,337    326,741 
Other service revenue   94,430    95,635 
Laser Ally   19,130    22,530 
Accessories and other revenues   542,129    681,023 
   $5,097,779   $6,035,063 
Summary of Sales by Geographic Area

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

 

   Three Months Ended June 30,   Six Months Ended June 30, 
   2019   2018   2019   2018 
Sales by geographic area:                    
United States of America  $2,477,717   $3,386,146   $4,992,059   $5,824,934 
Foreign   69,266    177,404    105,720    210,129 
                     
   $2,546,983   $3,563,550   $5,097,779   $6,035,063