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Revenues - Contract Balances (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2019
Jun. 30, 2019
Contract Assets Activity [Roll Forward]        
Balance at beginning of period $ 175 $ 289 $ 289  
Tenant openings (139) (139)    
Executed leases 190 25    
Balance at end of period 226 175 226  
Change in Contract with Customer, Liability [Roll Forward]        
Contract liability 261 265 265  
Completed performance obligation 0 (4)    
Contract obligation 0 0    
Contract liability 261 261 261  
Contract with Customer, Asset, after Allowance for Credit Loss [Abstract]        
Contract assets 175 289 289 $ 226
Expected Settlement Period        
2019       (155)
2020       (25)
2021       (42)
2022       0
2023       (4)
Contract with Customer, Liability [Abstract]        
Contract liability $ 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%