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Liabilities - Long-term Debt (Details) - Mortgage Payable
$ in Millions
Sep. 30, 2016
USD ($)
building
Dec. 31, 2015
USD ($)
Long-term debt    
Mortgage payable outstanding $ 1.3 $ 1.5
Number of buildings held for sale | building 1  
Annual interest rate accrued on mortgage (as a percent) 7.91%  
Fair value of debt instrument $ 1.3 $ 1.6