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Lease Abandonment Charge (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Lease Abandonment Charge      
Current portion of lease abandonment $ 42 $ 433  
Accrued expenses and other current liabilities      
Lease Abandonment Charge      
Current portion of lease abandonment 41    
Lease abandonment      
Lease Abandonment Charge      
Balance at beginning of year 474    
Charged to expense   740  
Paid or settled (433) (266)  
Balance at end of year 41 474  
Lease abandonment | General and administrative expenses      
Lease Abandonment Charge      
Charged to expense $ 0 $ 800 $ 0