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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% |

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