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Indebtedness (Details)
$ in Thousands
12 Months Ended
Dec. 02, 2013
USD ($)
Oct. 11, 2012
item
Dec. 31, 2015
USD ($)
Dec. 31, 2013
Dec. 31, 2014
USD ($)
Long-term debt          
Total long-term debt     $ 1,870   $ 2,866
Current installments     (1,011)   (993)
Long-term debt, excluding current installments     859   1,873
Aggregate maturities of long-term debt          
2016     1,011    
2017     859    
Total long-term debt     1,870   2,866
Revolving credit facility          
Indebtedness          
Maximum borrowing capacity $ 40,000        
Borrowings outstanding     $ 0    
Repayments of debt $ 5,100        
Revolving credit facility | LIBOR          
Indebtedness          
Variable interest rate       LIBOR  
Revolving credit facility | LIBOR | Minimum          
Indebtedness          
Margin over variable interest rate (as a percent)     1.00%    
Revolving credit facility | LIBOR | Maximum          
Indebtedness          
Margin over variable interest rate (as a percent)     1.50%    
Revolving credit facility | Prime rate          
Indebtedness          
Variable interest rate       prime rate  
Revolving credit facility | Prime rate | Minimum          
Indebtedness          
Margin over variable interest rate (as a percent)     0.00%    
Revolving credit facility | Prime rate | Maximum          
Indebtedness          
Margin over variable interest rate (as a percent)     0.25%    
Equipment Loans          
Indebtedness          
Debt instrument period     5 years    
Interest rate (as a percent)   1.83%      
Number of machines financed | item   2      
Amount advanced on loan     $ 5,000    
Long-term debt          
Total long-term debt     1,870   2,866
Aggregate maturities of long-term debt          
Total long-term debt     $ 1,870   $ 2,866