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Liabilities (Details 3) - Mortgage Payable - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Debt    
Mortgage payable outstanding $ 1.6 $ 1.8
Annual interest rate accrued on mortgage (as a percent) 7.91%  
Level 3    
Debt    
Fair value of debt instrument $ 1.7 $ 2.0