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Debt and Leases (Details)
ft² in Thousands, $ in Thousands
1 Months Ended 12 Months Ended
Apr. 30, 2016
Nov. 30, 2015
Oct. 31, 2016
USD ($)
ft²
transaction
Nov. 09, 2015
USD ($)
Oct. 31, 2015
USD ($)
Mar. 05, 2013
USD ($)
Debt Instrument [Line Items]            
Other Commitment, Due in Next Twelve Months     $ 5,275      
Other Commitment, Due in Second Year     26,530      
Other Commitment, Due in Third Year     3,426      
Other Commitment, Due in Fourth Year     3,954      
Other Commitment, Due in Fifth Year     3,743      
Other Commitment, Due after Fifth Year     40,250      
Line of Credit Facility, Amount Outstanding     0   $ 2,945  
Capital Lease Obligations     660   726  
Debt, Long-term and Short-term, Combined Amount     83,178   16,303  
Long-term Debt, Current Maturities     5,275   7,358  
Long-term Debt, Excluding Current Maturities     77,903   8,945  
Debt and Capital Leases, Future Minimum Payments Due     $ 83,178      
Manufacturing facility [Member]            
Debt Instrument [Line Items]            
Area of Real Estate Property | ft²     65      
Amount of Expected Increase in Real Estate Property | ft²     102      
Expected Area of Real Estate Property | ft²     167      
Hercules Capital, Inc. [Member]            
Debt Instrument [Line Items]            
Term of loan     30 months      
Other Deductions and Charges     $ 1,700      
Increase in end of term charge     2,100      
Proceeds from Issuance of Debt     $ 15,000      
Debt Instrument, Covenant Description     The loan contains a financial covenant whereby the Company is required to maintain an unrestricted cash balance of at least (a) 75% of the outstanding Loan balance plus (b) the amount of accounts payable (as defined under GAAP) not paid within 90 days of the date payment was issued.      
Debt Instrument, Interest Rate During Period     9.50%      
Line of Credit Facility, Amount Outstanding     $ 20,521   0  
Line of Credit Facility, Maximum Borrowing Capacity     $ 25,000      
PNC Energy Capital, LLC [Member]            
Debt Instrument [Line Items]            
Number of Sales-Leaseback Transactions Completed | transaction     3      
Line of Credit Facility, Amount Outstanding     $ 41,603   0  
State of Connecticut [Member]            
Debt Instrument [Line Items]            
Term of loan     15 years      
Debt Instrument, Interest Rate, Stated Percentage     2.00%      
Connecticut Development Authority Note [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount     $ 4,000      
Line of Credit Facility, Amount Outstanding     $ 2,589   2,817  
Debt Instrument, Interest Rate, Stated Percentage     5.00%      
Connecticut Clean Energy Fund [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Term     48 months      
Debt Instrument, Deferment Period     8 years      
Line of Credit Facility, Amount Outstanding     $ 6,050   6,052  
Line of Credit Facility, Maximum Borrowing Capacity           $ 5,900
Debt Instrument, Interest Rate, Stated Percentage           5.00%
NRG Energy [Member]            
Debt Instrument [Line Items]            
Term of loan     5 years      
Line of Credit Facility, Maximum Borrowing Capacity     $ 40,000      
CT Dept of Economic & Community Development [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount       $ 10,000    
NRG Energy, Inc. [Member]            
Debt Instrument [Line Items]            
Line of Credit Facility, Amount Outstanding     1,755   3,763  
First Tranche [Member] | Hercules Capital, Inc. [Member]            
Debt Instrument [Line Items]            
Loan Advance     5,000      
Loan and security agreement [Member] | Hercules Capital, Inc. [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Term 30 months          
Second Tranche [Member] | Hercules Capital, Inc. [Member]            
Debt Instrument [Line Items]            
Loan Advance     5,000      
CT Dept of Economic & Community Development [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount     $ 10,000   $ 0  
Debt Instrument, Deferment Period   4 years        
Minimum [Member] | NRG Energy [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Interest Rate During Period     8.00%      
Maximum [Member] | NRG Energy [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Interest Rate During Period     8.50%