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Other Non-Current Liabilities
 12 Months Ended
Dec. 31, 2023
Asset Retirement Obligation Disclosure [Abstract]  
Other Non-Current Liabilities Other Non-Current Liabilities
The Company’s other non-current liabilities at December 31, 2023 consisted of AROs of $2,016, and the fair value of the put option on the 12.5% Notes of $0. The Company’s other non-current liabilities at December 31, 2022 consisted of AROs of $1,989 and the long-term portion of fair value of the put option on the 12.5% Notes of $45. See Note 14, Long-Term Debt for discussion of 12.5% Notes.
AROs consists of estimated future spending related to removing certain leasehold improvements at the Company’s facilities in Portage, Indiana and Warren, New Jersey, and returning all facilities to their original condition. Depreciation expense related to the ARO assets included in overall depreciation expense for the periods ended December 31, 2023 and 2022 were $7 and $25, respectively.
Below is a schedule of activity in the Company’s liability for AROs for the year ended December 31, 2023 and 2022.
Balance at December 31, 2021$1,712 
Additions110 
Accretion167 
Balance at December 31, 20221,989 
Additions— 
Accretion27 
Balance at December 31, 2023$2,016