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Debt and Capital Lease Arrangements (Narrative) (Details)
12 Months Ended
Apr. 14, 2014
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Line of Credit Facility [Line Items]      
Line of credit   $ 0 $ 0
Silicon Valley Bank | Line of Credit | Revolving Credit Facility | 2011 Loan Agreement      
Line of Credit Facility [Line Items]      
Line of credit facility, maximum borrowing capacity   40,000,000.0  
Debt instrument, minimum net cash balance before increase in variable rate   $ 1  
Line of credit facility, unused capacity, commitment fee percentage   0.15%  
Debt instrument, covenant, fixed charge coverage ratio, minimum allowed   1.1  
Debt instrument, covenant, fixed charge coverage ratio, calculation period   12 months  
Line of credit facility, remaining borrowing capacity   $ 40,000,000  
Line of credit   $ 0  
Debt instrument, covenant, minimum remaining borrowing capacity threshold, percent   20.00%  
Repayments of lines of credit $ 3,800,000    
Debt Instrument, Maturity Date   Sep. 27, 2018  
Silicon Valley Bank | Line of Credit | Revolving Credit Facility | 2011 Loan Agreement | Prime Rate | Net Cash Balance Exceeding One Dollar, Maintained      
Line of Credit Facility [Line Items]      
Debt instrument, basis spread on variable rate   0.00%  
Silicon Valley Bank | Line of Credit | Revolving Credit Facility | 2011 Loan Agreement | Prime Rate | Net Cash Balance Exceeding One Dollar, Not Maintained      
Line of Credit Facility [Line Items]      
Debt instrument, basis spread on variable rate   1.50%  
Silicon Valley Bank | Line of Credit | Revolving Credit Facility | 2011 Loan Agreement | London Interbank Offered Rate (LIBOR) | Net Cash Balance Exceeding One Dollar, Maintained      
Line of Credit Facility [Line Items]      
Debt instrument, basis spread on variable rate   2.00%