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Consolidated Financial Statement Components | 9 Months Ended
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Sep. 30, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Consolidated Financial Statement Components | CONSOLIDATED FINANCIAL STATEMENT COMPONENTS Depreciation, Amortization and Accretion Depreciation, amortization 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) | 2022 |  | 2021 |  | 2022 |  | 2021
Depreciation |  |  |  |  |  |  |
Leasehold improvements | $ | 16 |  |  | $ | 18 |  |  | $ | 51 |  |  | $ | 52 |
Asset retirement costs | (176) |  |  | (22) |  |  | (526) |  |  | (66) |
Paging and computer equipment | 763 |  |  | 871 |  |  | 2,413 |  |  | 2,923 |
Furniture, fixtures and vehicles | 55 |  |  | 65 |  |  | 185 |  |  | 185 |
Total depreciation | 658 |  |  | 932 |  |  | 2,123 |  |  | 3,094 |
Amortization |  |  |  |  |  |  |
Intangible assets | — |  |  | — |  |  | — |  |  | 417 |
Capitalized software development costs | — |  |  | 1,482 |  |  | — |  |  | 3,779 |
Total amortization | — |  |  | 1,482 |  |  | — |  |  | 4,196 |
Accretion | 170 |  |  | 154 |  |  | 510 |  |  | 462 |
Total depreciation, amortization and accretion expense | $ | 828 |  |  | $ | 2,568 |  |  | $ | 2,633 |  |  | $ | 7,752 |
Accounts Receivable, Net Accounts receivable was recorded net of an allowance of $1.6 million at both September 30, 2022, and December 31, 2021. Accounts receivable, net includes $6.8 million and $7.1 million of unbilled receivables at September 30, 2022, and December 31, 2021, 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, 2022 |  | December 31, 2021
Leasehold improvements | shorter of useful life or lease term |  | $ | 2,496 |  |  | $ | 3,307 |
Asset retirement costs | 1-5 |  | 2,307 |  |  | 2,307 |
Paging and computer equipment | 1-5 |  | 87,183 |  |  | 89,844 |
Furniture, fixtures and vehicles | 3-5 |  | 3,321 |  |  | 3,668 |
Total property and equipment |  |  | 95,307 |  |  | 99,126 |
Accumulated depreciation |  |  | (88,928) |  |  | (92,380) |
Total property and equipment, net |  |  | $ | 6,379 |  |  | $ | 6,746 |

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- Definition The entire disclosure for supplemental balance sheet disclosures, including descriptions and amounts for assets, liabilities, and equity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -URI https://asc.fasb.org/topic&trid=2122208 + Details
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