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Consolidated Financial Statement Components (Tables)
 9 Months Ended
Sep. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Summary of 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)2021202020212020
Depreciation
Leasehold improvements$18 $13 $52 $43 
Asset retirement costs(22)(161)(66)(482)
Paging and computer equipment871 1,237 2,923 4,110 
Furniture, fixtures and vehicles65 81 185 232 
Total depreciation932 1,170 3,094 3,903 
Amortization
Intangible assets— 625 417 1,875 
Capitalized software development costs1,482 422 3,779 422 
Total amortization1,482 1,047 4,196 2,297 
Accretion154 118 462 353 
Total depreciation, amortization and accretion expense$2,568 $2,335 $7,752 $6,553 
Property, Plant and Equipment
Property and equipment, net consisted of the following as of the dates stated:
(Dollars in thousands)Useful Life
 (In Years)		September 30, 2021December 31, 2020
Leasehold improvementsshorter of useful life or lease term$3,179 $3,628 
Asset retirement costs
1-5
3,717 3,717 
Paging and computer equipment
1-5
90,684 92,608 
Furniture, fixtures and vehicles
3-5
3,556 3,517 
Total property and equipment101,136 103,470 
Accumulated depreciation(93,302)(95,655)
Total property and equipment, net$7,834 $7,815 
Schedule Of Capitalized Computer Software
The net consolidated balance of capitalized software development consisted of the following at September 30, 2021:
(Dollars in thousands)Useful Life
(In Years)		Gross Carrying
Amount		Accumulated
Amortization		Net Balance
Capitalized software development3$19,491 $(4,853)$14,638