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Commitments and Contingencies (Details) - USD ($)
12 Months Ended
Oct. 05, 2018
Dec. 31, 2018
Loss Contingencies    
Commitment to fund amount $ 20,000,000.0  
Revolving Credit Facility | Unsecured Debt    
Loss Contingencies    
Letters of credit outstanding   $ 2,600,000
Geographic Concentration Risk | California    
Loss Contingencies    
Contribution risk, percentage   90.10%
Customer Concentration Risk | Rentable Square Feet    
Loss Contingencies    
Contribution risk, percentage   29.10%
Customer Concentration Risk | Rentable Square Feet | Media And Entertainment Sector    
Loss Contingencies    
Contribution risk, percentage   19.60%
Customer Concentration Risk | Rentable Square Feet | Technology Sector    
Loss Contingencies    
Contribution risk, percentage   30.20%