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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, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Aug. 30, 2018
USD ($)
Dec. 18, 2017
USD ($)
Debt Instrument                
Proceeds from Convertible Debt     $ 87,500,000 $ 75,800,000        
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       $ 100,000        
Debt Instrument, Fair Value Disclosure       9,200,000        
Recognition of gain or loss on extinguishment $ 0     $ 1,003,000 $ 0 $ 0    
Estimated useful life of assets 10 years              
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        
Debt Instrument, Face Amount               $ 150,000,000
Debt Issuance Costs, Gross               $ 4,100,000
Convertible Debt       11,600,000        
Convertible Debt Exchange - Total cash consideration       $ 50,000,000.0        
2020 Convertible debt exchange - share payment total | shares       10,368,956        
2020 convertible debt exchange - percentage of principal       85.00%        
2020 convertible debt exchange - accrued interest       $ 1,300,000        
Principal amount of convertible notes       1,000        
Convertible debt exchange       $ 9,600,000        
Mortgage Debt Interest Rate_Base_Revere_LXRX             5.50%  
Mortgage Debt Interest Rate BasePlus_Revere_LXRX             7.50%  
Mortgage Debt Instrument_Revere_LXRX             $ 12,900,000  
Mortgage Debt Balloon Payment_LXRX             $ 10,300,000