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Short-Term Borrowings (Details) - USD ($)
3 Months Ended
Sep. 19, 2016
Mar. 31, 2017
Dec. 31, 2016
Line of Credit Facility [Line Items]      
Outstanding balance   $ 40,000,000 $ 25,000,000
Remaining borrowing capacity   3,900,000  
Geographic Distribution, Foreign [Member] | Trade Accounts Receivable [Member] | Maximum [Member]      
Line of Credit Facility [Line Items]      
Borrowing formula, eligible accounts receivable 85.00%    
Swingline Loan [Member] | 2016 Debt Agreement [Domain]      
Line of Credit Facility [Line Items]      
Current borrowing capacity $ 10,000,000.0    
Letter of Credit [Member] | 2016 Debt Agreement [Domain]      
Line of Credit Facility [Line Items]      
Current borrowing capacity 10,000,000.0    
Line of Credit [Member] | 2016 Debt Agreement [Domain]      
Line of Credit Facility [Line Items]      
Current borrowing capacity 55,000,000.0    
Maximum borrowing capacity 25,000,000.0 55,000,000  
Borrowing formula, amount over eligible accounts receivable (up to $5.0 million) 7,500,000    
Liquidity threshold for the first and second month of any fiscal quarter 20,000,000.0    
Liquidity threshold for the last month of any fiscal quarter 25,000,000.0    
Annual administrative fee 25,000    
Annual commitment fee 82,500    
Loan origination fees $ 300,000    
Cancellation fee percentage 0.75%    
Line of Credit, Gross Borrowing Availability   $ 43,900,000  
Line of Credit [Member] | 2016 Debt Agreement [Domain] | Availability, 70 Percent Or More [Member]      
Line of Credit Facility [Line Items]      
Percentage of commitment fee on unused capacity 0.35%    
Line of Credit [Member] | 2016 Debt Agreement [Domain] | Availability, 30 Percent Or More And Less Than 70 Percent [Member]      
Line of Credit Facility [Line Items]      
Percentage of commitment fee on unused capacity 0.325%    
Line of Credit [Member] | 2016 Debt Agreement [Domain] | Availability, Below 30 Percent [Member]      
Line of Credit Facility [Line Items]      
Percentage of commitment fee on unused capacity 0.30%    
Line of Credit [Member] | 2016 Debt Agreement [Domain] | Prime Rate [Member] | Availability, 70 Percent Or More [Member]      
Line of Credit Facility [Line Items]      
Basis spread on variable interest rate 0.50% 0.25%  
Line of Credit [Member] | 2016 Debt Agreement [Domain] | Prime Rate [Member] | Availability, 30 Percent Or More And Less Than 70 Percent [Member]      
Line of Credit Facility [Line Items]      
Basis spread on variable interest rate 0.75% 0.50%  
Line of Credit [Member] | 2016 Debt Agreement [Domain] | Prime Rate [Member] | Availability, Below 30 Percent [Member]      
Line of Credit Facility [Line Items]      
Basis spread on variable interest rate 1.00% 0.75%  
Line of Credit [Member] | 2016 Debt Agreement [Domain] | Minimum [Member]      
Line of Credit Facility [Line Items]      
Liquidity threshold for the last month of any fiscal quarter     $ 40,000,000
Financial covenant, monthly liquidity as of the last day of the first and second month of any fiscal quarter $ 15,000,000.0    
Financial covenant, monthly liquidity as of the last day of the last month of the quarter $ 20,000,000.0    
Line of Credit [Member] | 2016 Debt Agreement [Domain] | Geographic Distribution, Domestic [Member] | Trade Accounts Receivable [Member]      
Line of Credit Facility [Line Items]      
Borrowing formula, eligible accounts receivable 85.00%    
Line of Credit [Member] | 2016 Debt Agreement [Domain] | Geographic Distribution, Foreign [Member] | Trade Accounts Receivable [Member] | Minimum [Member]      
Line of Credit Facility [Line Items]      
Borrowing formula, eligible accounts receivable 75.00%