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Real Estate and Intangible Assets - Summary of Acquired Properties (Details) $ in Thousands |  |  | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 22, 2017 USD ($) ft² | May 26, 2016 USD ($) ft² | Jun. 30, 2017 USD ($) ft² | Jun. 30, 2016 USD ($) | Dec. 31, 2016 ft² | Jul. 25, 2014 ft²
Business Acquisition [Line Items] |  |  |  |  |  |
Square Footage (unaudited) | ft² |  |  |  |  |  | 81,371
Purchase Price |  |  | $ 15,697 | $ 17,000 |  |
Series of Property Acquisitions |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Square Footage (unaudited) | ft² |  |  | 60,016 |  | 107,062 |
Lease Term |  |  |  | 6 years |  |
Purchase Price |  |  | $ 15,697 | $ 17,000 |  |
Acquisition Expenses |  |  | 247 | 105 |  |
Annualized GAAP Rent |  |  |  | 1,393 |  |
Debt Issued or Assumed |  |  | 11,179 | 9,900 |  |
Conshohocken, Pennsylvania |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Square Footage (unaudited) | ft² | 60,016 |  |  |  |  |
Lease Term | 8 years 6 months |  |  |  |  |
Purchase Price |  |  | 15,700 |  |  |
Annualized GAAP Rent | $ 1,680 |  |  |  |  |
Debt assumed |  |  | 11,200 |  |  |
Capital expenditure | $ 200 |  |  |  |  |
Stated interest rate (as percent) | 1.80% |  |  |  |  |
Conshohocken, Pennsylvania | Interest rate swap |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Interest rate swap | $ 40 |  | 200 |  |  |
Conshohocken, Pennsylvania | Interest rate swap | LIBOR |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Basis spread | 3.55% |  |  |  |  |
Salt Lake City, Utah |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Square Footage (unaudited) | ft² |  | 107,062 |  |  |  |
Lease Term |  | 6 years |  |  |  |
Purchase Price |  | $ 17,000 |  |  |  |
Annualized GAAP Rent |  | 1,400 |  |  |  |
Debt Issued or Assumed |  | $ 9,900 |  |  |  |
Asset acquisition |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Purchase Price |  |  | $ 15,697 | $ 0 |  |

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