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Consolidated Financial Statement Components - Depreciation, Amortization and Accretion (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Property, Plant and Equipment [Line Items] |  |  |  |
Depreciation | $ 932 | $ 1,170 | $ 3,094 | $ 3,903
Amortization |  |  |  |
Intangible assets | 0 | 625 | 417 | 1,875
Capitalized software development costs | 1,482 | 422 | 3,779 | 422
Total amortization | 1,482 | 1,047 | 4,196 | 2,297
Accretion | 154 | 118 | 462 | 353
Total depreciation, amortization and accretion expense | 2,568 | 2,335 | 7,752 | 6,553
Leasehold improvements |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Depreciation | 18 | 13 | 52 | 43
Asset retirement costs |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Depreciation | 22 | 161 | 66 | 482
Paging and computer equipment |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Depreciation | 871 | 1,237 | 2,923 | 4,110
Furniture, fixtures and vehicles |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Depreciation | $ 65 | $ 81 | $ 185 | $ 232

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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 http://asc.fasb.org/extlink&oid=123570139&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 http://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 http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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- Definition Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848 + Details
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