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Debt Obligations
 9 Months Ended
Sep. 30, 2021
Debt Disclosure [Abstract]  
Debt Obligations Debt Obligations
As of
(in thousands)September 30, 2021December 31, 2020
Finance lease obligations$4,441 $5,526 
PPP Loan— 3,305 
Senior Term Loan due December 2021, related party— 16,000 
Less: net unamortized debt issuance costs— (465)
Less: net unamortized debt discount— (480)
Senior Term Loan due December 2021, net— 15,055 
4,441 23,886 
Less: Current maturities(1,033)(18,441)
Total long-term debt$3,408 $5,445 
Senior Term Loan
On December 7, 2018, the Company, and ADA-ES, Inc. ("ADA"), a wholly-owned subsidiary, and certain other subsidiaries of the Company as guarantors, The Bank of New York Mellon as administrative agent, and Apollo Credit Strategies Master Fund Ltd and Apollo A-N Credit Fund (Delaware) L.P. (collectively "Apollo"), affiliates of a beneficial owner of greater than five percent of the Company's common stock and a related party, entered into the Term Loan and Security Agreement (the "Senior Term Loan") in the amount of $70.0 million less original issue discount of $2.1 million. Proceeds from the Senior Term Loan were used to fund the acquisition of Carbon Solutions. The Company also paid debt issuance costs of $2.0 million related to the Senior Term Loan. The Senior Term Loan bore interest at a rate equal to 3-month LIBOR (subject to a 1.5% floor) + 4.75% per annum, which was adjusted quarterly to the current 3-month LIBOR rate, and interest was payable quarterly in arrears.
On June 1, 2021 and prior to the Senior Term Loan's maturity date, the Company paid-off in its entirety the Senior Term Loan and all remaining accrued interest through this date. The Company did not incur any prepayment fees associated with the early pay-off.
Line of Credit
In September 2013, ADA, as borrower, and the Company, as guarantor, entered into a line credit (the "Line of Credit") with a bank (the "Lender") for an aggregate borrowing amount of $10.0 million, which was secured by certain amounts due to the Company from certain Tinuum Group RC leases. The Line of Credit has been amended 16 times from the period from December 2, 2013 through September 30, 2021 and included a reduction in the borrowing amount to $5.0 million in September 2018.
On March 23, 2021, ADA, the Company and the Lender entered into an amendment to the Line of Credit (the "Fifteenth Amendment"), which extended the maturity date of the Line of Credit to December 31, 2021 and increased the minimum cash requirement from $5.0 million to $6.0 million.
On July 29, 2021, the Company and the Lender entered into the Sixteenth Amendment (the "Sixteenth Amendment") to the Line of Credit. The Sixteenth Amendment amends certain terms and conditions related to collateral securing the Line of Credit.
As of September 30, 2021 and December 31, 2020, there were no outstanding borrowings under the Line of Credit.