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Consolidated Financial Statement Components - Depreciation, Amortization and Accretion (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Property, Plant and Equipment [Line Items] |  |  |  |
Total depreciation | $ 658 | $ 932 | $ 2,123 | $ 3,094
Amortization |  |  |  |
Intangible assets | 0 | 0 | 0 | 417
Capitalized software development costs | 0 | 1,482 | 0 | 3,779
Total amortization | 0 | 1,482 | 0 | 4,196
Accretion | 170 | 154 | 510 | 462
Total depreciation, amortization and accretion expense | 828 | 2,568 | 2,633 | 7,752
Leasehold improvements |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Depreciation | 16 | 18 | 51 | 52
Asset retirement costs |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Asset retirement costs | (176) | (22) | (526) | (66)
Paging and computer equipment |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Depreciation | 763 | 871 | 2,413 | 2,923
Furniture, fixtures and vehicles |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Depreciation | $ 55 | $ 65 | $ 185 | $ 185

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI https://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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