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Agreement with New York University on Behalf of New York University Medical Center (Details)
1 Months Ended 12 Months Ended
Jul. 31, 2018
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2019
USD ($)
Installment
Dec. 31, 2018
USD ($)
Dec. 31, 2016
USD ($)
Party
Dec. 31, 2009
USD ($)
Dec. 31, 2008
USD ($)
Oct. 31, 2018
USD ($)
Jun. 30, 2017
USD ($)
Apr. 30, 2016
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Agreement With New York University [Abstract]                        
Lease obligation     $ 990,000                  
NYU Revenue Recognition [Abstract]                        
Maintenance services revenue     3,070,000 $ 3,424,000                
NYU Accounts Receivable and Contract Balances [Abstract]                        
Accounts receivable     356,000 318,000                
Perfexion Gamma Knife [Member]                        
Agreement With New York University [Abstract]                        
Lease obligation     $ 990,000 2,387,000                
Monthly lease payment                       $ 78,000
Maximum estimated site work cost   $ 1,088,000                    
ICON Imaging Technology [Member]                        
Agreement With New York University [Abstract]                        
Lease obligation         $ 879,000              
Monthly lease payment         20,000              
Gamma Knife Cobalt Reload [Member]                        
Agreement With New York University [Abstract]                        
Lease obligation               $ 833,000        
Monthly lease payment               $ 30,000        
NYU [Member]                        
Agreement With New York University [Abstract]                        
Term of lease agreement with NYC     7 years                  
Term of option     3 years                  
Purchase price of gamma knife equipment   2,400,000                    
Number of monthly installments | Installment     41                  
Monthly lease payment   50,000                    
Final lease payment amount   $ 350,000                    
Estimated fair value of equipment                 $ 2,570,000      
NYU Revenue Recognition [Abstract]                        
Maintenance services revenue     $ 3,070,000 3,424,000                
Lease Income     2,754,000 3,108,000                
NYU [Member] | Maintenance [Member]                        
NYU Revenue Recognition [Abstract]                        
Maintenance services revenue     $ 316,000 316,000                
NYU [Member] | Perfexion Gamma Knife [Member]                        
Agreement With New York University [Abstract]                        
Term of lease agreement with NYC     7 years                  
Extension of agreement     12 years                  
Cost of new equipment installed           $ 3,742,000 $ 3,742,000          
NYU [Member] | Perfexion Gamma Knife, Purchase and Replacement [Member]                        
Agreement With New York University [Abstract]                        
Term of lease agreement with NYC     6 years                  
Lease obligation                     $ 4,700,000  
Monthly lease payment                   $ 20,000    
NYU [Member] | Perfexion Gamma Knife, New Installation and Related Construction Costs [Member]                        
Agreement With New York University [Abstract]                        
Term of lease agreement with NYC     2 years                  
Lease obligation                     $ 250,000  
NYU [Member] | ICON Imaging Technology [Member]                        
Agreement With New York University [Abstract]                        
Term of lease agreement with NYC     4 years                  
Cost of new equipment installed         816,000              
Lease obligation         879,000              
Monthly maintenance agreement cost         $ 6,000              
Number of parties agreed to receive payment | Party         2              
Monthly lease payment       30,000           $ 30,000    
Final lease payment amount       350,000                
NYU [Member] | Gamma Knife Cobalt Reload [Member]                        
Agreement With New York University [Abstract]                        
Term of lease agreement with NYC     30 months                  
Cost of new equipment installed $ 925,000                      
Lease obligation 833,000                      
Installation costs of technology $ 578,000                      
Monthly lease payment       50,000                
Cobalt reload cost       $ 1,503,000