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Lease Abandonment Charge (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Lease Abandonment Charge        
Lease abandonment liability recorded in accrued expenses   $ 262   $ 433
Lease abandonment        
Lease Abandonment Charge        
Charged to expense   0    
Balance at beginning of year   474    
Paid or settled   (212)    
Balance at end of year   $ 262    
Lease abandonment | General and administrative expenses        
Lease Abandonment Charge        
Charged to expense $ 200   $ 700