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Revenues - Contract Balances (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2019
Sep. 30, 2019
Contract Assets Activity [Roll Forward]          
Balance at beginning of period $ 226 $ 175 $ 289 $ 289  
Tenant openings (142) (139) (139)    
Executed leases 118 190 25    
Balance at end of period 202 226 175 202  
Contract Liability Activity [Roll Forward]          
Contract liability 261 261 265 265  
Completed performance obligation 0 0 (4)    
Contract obligation 0 0 0    
Contract liability 261 261 261 261  
Contract with Customer, Asset, after Allowance for Credit Loss [Abstract]          
Contract assets 226 175 289 289 $ 202
Expected Settlement Period          
2019         (19)
2020         (136)
2021         (43)
2022         0
2023         (4)
Contract with Customer, Liability [Abstract]          
Contract liability $ 261 $ 261 $ 265 $ 265 261
Expected Settlement Period          
2019         (99)
2020         (54)
2021         (54)
2022         $ (54)
Lease commission recognized upon tenant opening (as a percent)       50.00%