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Debt Financing and Revolving Credit Facilities (Narrative) (Details)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Aug. 06, 2021
USD ($)
$ / shares
Jul. 31, 2021
USD ($)
May 14, 2021
USD ($)
$ / shares
Nov. 24, 2020
USD ($)
$ / shares
Oct. 08, 2020
USD ($)
Jul. 30, 2021
USD ($)
Sep. 30, 2021
USD ($)
$ / shares
shares
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Item
$ / shares
shares
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
$ / shares
shares
Jul. 14, 2021
USD ($)
Dec. 18, 2020
USD ($)
Oct. 13, 2020
USD ($)
Aug. 07, 2020
USD ($)
Apr. 16, 2020
USD ($)
Line of Credit Facility [Line Items]                                
Class of warrant or right percentage of outstanding common shares     5.00%                          
Gain on extinguishment of debt             $ 10,129,000 $ 0 $ 10,129,000 $ 0            
Common Stock, Par or Stated Value Per Share | $ / shares     $ 0.01 $ 0.01     $ 0.01   $ 0.01   $ 0.01          
Class Of Warrant Or Right, Percentage Of Oustanding Common Shares       23.00%                        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares             5,386,591   5,386,591   5,307,539          
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares             $ 0.01   $ 0.01   $ 0.01          
Additional warrant liability                 $ 7,351,000              
Warrants and Rights Outstanding             $ 31,699,000   31,699,000   $ 12,730,000          
Letter of Credit [Member]                                
Line of Credit Facility [Line Items]                                
Equity Fee             500,000   500,000              
Paycheck Protection Program Loan [Member]                                
Line of Credit Facility [Line Items]                                
Aggregate principal amount                       $ 10,000,000       $ 10,000,000
Gain on extinguishment of debt             10,129,000                  
Remaining Balance Of Loan             0   0              
Siena Loan Agreement [Member]                                
Line of Credit Facility [Line Items]                                
Line of Credit Facility, Remaining Borrowing Capacity             31,000   31,000   9,701,000          
deferred financing costs, gross         $ 1,101,000   1,037,000   1,037,000              
Maximum borrowing capacity, description           the outstanding balance of all Revolving Loans may not exceed the lesser of (A) the Maximum Revolving Facility Amount minus the Availability Block and (B) an amount equal to the issued and undrawn portion of the Third Amendment Letter of Credit (as defined above) minus the Availability Block. The term “Availability Block”, as defined in the Amended and Restated Loan and Security Agreement, means 3.0% of the issued and undrawn amount under the Third Amendment Letter of Credit.                    
Issued and undrawn amount, Percentage           3.00%                    
Maximum borrowing capacity         $ 20,000,000   25,000,000   25,000,000              
Outstanding borrowings             $ 24,164,000   $ 24,164,000   6,874,000          
Value of eligible accounts         85.00%                      
Liquidation value         85.00%                      
Cost of eligible inventory         50.00%                      
Debt Instrument, Basis Spread on Variable Rate           2.00%                    
Interest rate             5.26%   5.26%              
Term Loan Credit Agreement [Member]                                
Line of Credit Facility [Line Items]                                
deferred financing costs     $ 480,000 $ 2,872,000     $ 2,827,000   $ 2,827,000   $ 2,814,000          
Aggregate principal amount     $ 56,000,000 $ 40,000,000                   $ 40,000,000    
Class of warrant or right percentage of outstanding common shares     5.00%                          
Term                 5 years              
Additional loan amount     $ 16,000,000           $ 16,000,000              
Debt Instrument Covenant For Additional Financing   $ 15,000,000                            
Additional loan interest rate                 14.00%              
Debt payment terms     Pursuant to the Amendment, in the event that the Additional Loan is not repaid in full by March 31, 2022, the Company shall issue to the Lender and/or an affiliate of the Lender a warrant (the “Additional Warrant”) to purchase a number of shares of the Company’s common stock, par value $0.01 per share, equal to 5% of the Company’s outstanding common stock on a fully-diluted basis at the time the Additional Warrant is exercised (after giving effect to such issuance).                          
Warrants outstanding term     10 years                          
Interest rate             14.00%   14.00%              
Common Stock, Par or Stated Value Per Share | $ / shares     $ 0.01                          
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares     $ 0.01                          
Additional warrant liability                 $ 7,351,000              
Term Loan Credit Agreement [Member] | Letter of Credit [Member]                                
Line of Credit Facility [Line Items]                                
Aggregate principal amount           $ 25,000,000                    
Term Loan Credit Agreement Third Amendment [Member]                                
Line of Credit Facility [Line Items]                                
Percentage of common stock 5.00%                              
Rail repayment liquidity condition to covert equity fee to cash $ 15,000                              
Cash fee $ 1,000                              
Percentage of common stock, Maximum 9.99%                              
Common Stock, Par or Stated Value Per Share | $ / shares $ 0.01                              
Equity Fee $ 1,000                              
M & T Bank [Member] | Revolving Credit Facility [Member]                                
Line of Credit Facility [Line Items]                                
Line of Credit Facility, Collateral                 6,842   6,975          
Maximum borrowing capacity             $ 40,000,000   $ 40,000,000              
Outstanding borrowings             $ 10,161,000   $ 10,161,000   $ 10,105,000          
Payment demand                         $ 10,114,000   $ 5,081,000  
Payment term                 5 days              
Interest coverage ratio | Item                 1.25              
Interest rate             4.18%   4.18%