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Debt Obligations - Narrative (Details)
1 Months Ended 12 Months Ended
Aug. 31, 2018
USD ($)
Dec. 31, 2017
Nov. 30, 2014
USD ($)
Dec. 31, 2019
USD ($)
$ / shares
Aug. 30, 2018
USD ($)
Dec. 18, 2017
USD ($)
Debt Instrument            
Proceeds from Convertible Debt     $ 87,500,000      
Convertible Debt Instrument Interest Rate Stated Percentage       5.25%    
Debt Instrument, Convertible, Conversion Ratio     118.4553      
Debt Instrument, Convertible, Conversion Price | $ / shares       $ 8.442    
Repurchase price       100.00%    
Debt Issuance Cost     $ 3,400,000      
Debt instrument, term 2 years 5 years 7 years      
Unamortized Debt Issuance Expense       $ 900,000    
Debt Instrument, Fair Value Disclosure       64,800,000    
Recognition of gain or loss on extinguishment $ 0          
Mortgage Debt Instrument_Revere_LXRX         $ 12,900,000  
Estimated useful life of assets 10 years          
Mortgage Debt Interest Rate_Base_Revere_LXRX         5.50%  
Mortgage Debt Balloon Payment_LXRX         $ 10,300,000  
Mortgage Debt Issue Costs_Revere_LXRX       $ 100,000 $ 400,000  
Debt Instrument, Interest Rate, Stated Percentage       9.00%    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate       $ 11,000,000.0    
Buildings Collateral       59,200,000    
Land Collateral       2,700,000    
Debt Instrument, Face Amount           $ 150,000,000
Debt Issuance Costs, Gross       $ 2,400,000   $ 4,100,000
Mortgage Debt Interest Rate BasePlus_Revere_LXRX         7.50%