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Consolidated Financial Statement Components
9 Months Ended
Sep. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Consolidated Financial Statement Components CONSOLIDATED FINANCIAL STATEMENT COMPONENTS
Depreciation and Accretion
Depreciation and accretion expenses consisted of the following for the periods stated:
For the Three Months Ended September 30,For the Nine Months Ended September 30,
(Dollars in thousands)2023202220232022
Depreciation
Leasehold improvements$24 $16 $51 $51 
Asset retirement costs66 (176)196 (526)
Paging and computer equipment959 763 2,864 2,413 
Furniture, fixtures and vehicles54 55 165 185 
Total depreciation1,103 658 3,276 2,123 
Accretion164 170 492 510 
Total depreciation and accretion expense$1,267 $828 $3,768 $2,633 
Accounts Receivable, Net
Accounts receivable was recorded net of an allowance of $1.2 million at September 30, 2023, and $1.8 million at December 31, 2022. Accounts receivable, net includes $6.0 million and $5.9 million of unbilled receivables at September 30, 2023, and December 31, 2022, respectively. Unbilled receivables are defined as the Company's right to consideration in exchange for goods or services that we have transferred to the customer but have not yet billed for, generally as a result of contractual billing terms.
Property and Equipment, Net
Property and equipment, net consisted of the following as of the dates stated:
(Dollars in thousands)Useful Life
 (In Years)
September 30, 2023December 31, 2022
Leasehold improvementsshorter of useful life or lease term$2,584 $2,497 
Asset retirement costs
1-5
3,848 3,848 
Paging and computer equipment
1-5
86,973 88,427 
Furniture, fixtures and vehicles
3-5
3,109 3,289 
Total property and equipment96,514 98,061 
Accumulated depreciation(89,138)(89,838)
Total property and equipment, net$7,376 $8,223