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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, 2021
USD ($)
Installment
Dec. 31, 2020
USD ($)
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 ($)
NYU Revenue Recognition [Abstract]                          
Maintenance services revenue     $ 1,061,000 $ 3,173,000                  
Lease Income       7,000                  
NYU Accounts Receivable and Contract Balances [Abstract]                          
Accounts receivable     0 346,000                  
Perfexion Gamma Knife [Member]                          
Agreement With New York University [Abstract]                          
Lease obligation     $ 0 89,000                  
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                    
Monthly lease payment   50,000                      
Purchase price of gamma knife equipment   2,400,000                      
Number of monthly installments | Installment     41                    
Final lease payment amount   $ 350,000                      
Estimated fair value of equipment                   $ 2,570,000      
NYU Revenue Recognition [Abstract]                          
Maintenance services revenue     $ 1,061,000 3,173,000                  
Lease Income     982,000 2,857,000                  
NYU [Member] | Maintenance [Member]                          
NYU Revenue Recognition [Abstract]                          
Maintenance services revenue     $ 79,000 $ 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