Subsequent Events (Details) - Subsequent events $ in Thousands	Sep. 28, 2020 USD ($) ft²	Sep. 21, 2020 USD ($) ft²
5 and 7 Waterside Crossing
Subsequent events
Sale price of land		$ 6,250
Area of building | ft²		161,000
Office or Flex Building at 55 Griffin Road South
Subsequent events
Sale price of land	$ 1,400
Area of building | ft²	40,000
Sale as Per current terms of agreement | 5 and 7 Waterside Crossing
Subsequent events
Gain (loss) on sale of assets		$ 1,700
Sale as Per current terms of agreement | Office or Flex Building at 55 Griffin Road South
Subsequent events
Gain (loss) on sale of assets	$ 1,000