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Property and Equipment (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Property and equipment          
Accumulated depreciation $ (340)   $ (340)   $ (330)
Property and equipment, net 1,834   1,834   375
Depreciation expense 60 $ 12 105 $ 37  
Construction in Progress          
Property and equipment          
Property and equipment, gross 598   598    
Furniture, computers and equipment          
Property and equipment          
Property and equipment, gross 1,540   1,540   687
Leasehold improvements          
Property and equipment          
Property and equipment, gross $ 36   $ 36   $ 18