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Commitments and Contingencies (Details) - Direct sublease agreement - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Lease        
Expenses incurred under related party transactions     $ 178 $ 86
Director        
Lease        
Expenses incurred under related party transactions $ 66 $ 34    
Future minimum lease payments under the sublease        
2016 65   65  
2017 263   263  
2018 268   268  
2019 251   251  
Total $ 847   $ 847