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Commitments (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
Dec. 31, 2011
Nov. 30, 2010
Mar. 31, 2016
Mar. 31, 2015
Operating Leases        
Initial term of the operating lease   5 years    
Extension term upon the completion of the initial lease term 5 years      
Rent expense     $ 200 $ 200
Future minimum annual lease commitments under the noncancelable operating lease        
Remainder 2015     703  
2017     467  
Total     $ 1,170