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Investment in Unconsolidated Real Estate Ventures - Summary of Results of Operations of Real Estate Ventures with Interests (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 USD ($) ft² property | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) ft² property | Sep. 30, 2018 USD ($) | Dec. 11, 2018 ft² property | Mar. 31, 2018
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity in income (loss) of Real Estate Ventures | $ (1,965) | $ 1 | $ (4,814) | $ (1,182) |  |
Number of properties | property | 95 |  | 95 |  |  |
Net rentable area (in square feet) | ft² | 16,711,387 |  | 16,711,387 |  |  |
DRA (G&I) Austin |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Revenue | $ 0 | 14,232 | $ 0 | 42,492 |  |
Operating expenses | 0 | (6,428) | 0 | (18,245) |  |
Interest expense, net | 0 | (2,549) | 0 | (7,070) |  |
Depreciation and amortization | 0 | (4,896) | 0 | (15,622) |  |
(Gain) loss on early extinguishment of debt | 0 | 0 | 0 | 0 |  |
Net income (loss) | $ 0 | $ 359 | $ 0 | $ 1,555 |  |
Ownership interest % | 0.00% | 50.00% | 0.00% | 50.00% | 50.00% |
Company's share of net income (loss) | $ 0 | $ 180 | $ 0 | $ 778 |  |
Basis adjustments and other | 0 | 243 | 0 | 378 |  |
Equity in income (loss) of Real Estate Ventures | 0 | 423 | 0 | 1,156 |  |
Number of properties | property |  |  |  |  | 12 |
Net rentable area (in square feet) | ft² |  |  |  |  | 1,570,123 |
Brandywine-AI Ventures LLC |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Revenue | 1,360 | 5,962 | 5,050 | 17,768 |  |
Operating expenses | (871) | (2,589) | (2,473) | (8,010) |  |
Interest expense, net | (222) | (873) | (698) | (2,606) |  |
Depreciation and amortization | (540) | (2,232) | (2,055) | (6,915) |  |
(Gain) loss on early extinguishment of debt | 4,371 | 0 | 4,371 | 0 |  |
Net income (loss) | $ 4,098 | $ 268 | $ 4,195 | $ 237 |  |
Ownership interest % | 50.00% | 50.00% | 50.00% | 50.00% |  |
Company's share of net income (loss) | $ 2,049 | $ 134 | $ 2,098 | $ 119 |  |
Basis adjustments and other | 31 | 31 | 101 | 33 |  |
Equity in income (loss) of Real Estate Ventures | $ 2,080 | $ 165 | 2,199 | 152 |  |
Evo At Cira Centre South Venture |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Revenue |  |  | 0 | 995 |  |
Operating expenses |  |  | 0 | (250) |  |
Interest expense, net |  |  | 0 | (388) |  |
Depreciation and amortization |  |  | 0 | (376) |  |
(Gain) loss on early extinguishment of debt |  |  | 0 | (718) |  |
Net income (loss) |  |  | $ 0 | $ (737) |  |
Ownership interest % | 0.00% | 50.00% | 0.00% | 50.00% |  | 50.00%
Company's share of net income (loss) |  |  | $ 0 | $ (369) |  |
Basis adjustments and other |  |  | 0 | 11 |  |
Equity in income (loss) of Real Estate Ventures |  |  | 0 | (358) |  |
MAP Venture |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Revenue | $ 17,476 | $ 17,243 | 53,560 | 50,976 |  |
Operating expenses | (11,981) | (10,219) | (35,747) | (30,347) |  |
Interest expense, net | (2,436) | (2,894) | (7,504) | (10,426) |  |
Depreciation and amortization | (6,247) | (4,654) | (19,146) | (14,096) |  |
(Gain) loss on early extinguishment of debt | 0 | (334) | 0 | (334) |  |
Net income (loss) | $ (3,188) | $ (858) | $ (8,837) | $ (4,227) |  |
Ownership interest % | 50.00% | 50.00% | 50.00% | 50.00% |  |
Company's share of net income (loss) | $ (1,594) | $ (429) | $ (4,419) | $ (2,114) |  |
Basis adjustments and other | (28) | (15) | (69) | (39) |  |
Equity in income (loss) of Real Estate Ventures | (1,622) | (444) | (4,488) | (2,153) |  |
Other |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Revenue | 13,890 | 4,580 | 42,538 | 13,708 |  |
Operating expenses | (5,017) | (1,904) | (15,736) | (5,145) |  |
Interest expense, net | (3,522) | (1,228) | (8,219) | (3,132) |  |
Depreciation and amortization | (6,307) | (1,481) | (19,078) | (4,430) |  |
(Gain) loss on early extinguishment of debt | 0 | 0 | 0 | 0 |  |
Net income (loss) | (956) | (33) | (495) | 1,001 |  |
Company's share of net income (loss) | (2,400) | (121) | (2,444) | 168 |  |
Basis adjustments and other | (23) | (22) | (81) | (147) |  |
Equity in income (loss) of Real Estate Ventures | (2,423) | 144 | (2,525) | 21 |  |
Unconsolidated Real Estate Ventures |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Revenue | 32,726 | 42,017 | 101,148 | 125,939 |  |
Operating expenses | (17,869) | (21,140) | (53,956) | (61,997) |  |
Interest expense, net | (6,180) | (7,544) | (16,421) | (23,622) |  |
Depreciation and amortization | (13,094) | (13,263) | (40,279) | (41,439) |  |
(Gain) loss on early extinguishment of debt | 4,371 | (334) | 4,371 | (1,052) |  |
Net income (loss) | (46) | (264) | (5,137) | (2,171) |  |
Company's share of net income (loss) | (1,945) | (236) | (4,765) | (1,418) |  |
Basis adjustments and other | (20) | 237 | (49) | 236 |  |
Equity in income (loss) of Real Estate Ventures | $ (1,965) | $ 1 | $ (4,814) | $ (1,182) |  |
Minimum |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership interest % | 15.00% |  | 15.00% |  |  |
Minimum | Unconsolidated Real Estate Ventures |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership interest % | 15.00% | 25.00% | 15.00% | 25.00% |  |
Maximum |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership interest % | 70.00% |  | 70.00% |  |  |
Maximum | Unconsolidated Real Estate Ventures |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership interest % | 70.00% | 70.00% | 70.00% | 70.00% |  |

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