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Consolidated Financial Statement Components
 6 Months Ended
Jun. 30, 2020
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 June 30,
 
For the Six Months Ended June 30,
(Dollars in thousands)
2020
 
2019
 
2020
 
2019
Depreciation
 
 
 
 
 
 
 
Leasehold improvements
$
14

 
$
12

 
$
30

 
$
36

Asset retirement costs
(160
)
 
(192
)
 
(321
)
 
(384
)
Paging and computer equipment
1,395

 
1,657

 
2,873

 
3,323

Furniture, fixtures and vehicles
81

 
95

 
151

 
193

Total depreciation
1,330

 
1,572

 
2,733

 
3,168

Amortization
625

 
625

 
1,250

 
1,250

Accretion
117

 
138

 
235

 
276

Total depreciation, amortization and accretion expense
$
2,072

 
$
2,335

 
$
4,218

 
$
4,694


Accounts Receivable, Net
Accounts receivable was recorded net of an allowance of $2.2 million and $1.3 million at June 30, 2020 and December 31, 2019, respectively. Accounts receivable, net includes $7.3 million and $6.4 million of unbilled receivables at June 30, 2020 and December 31, 2019, 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)
 
June 30, 2020
 
December 31, 2019
Leasehold improvements
shorter of useful life or lease term
 
$
3,620

 
$
3,620

Asset retirement costs
1-5
 
1,922

 
1,922

Paging and computer equipment
1-5
 
94,421

 
96,562

Furniture, fixtures and vehicles
3-5
 
3,490

 
3,716

Total property and equipment

 
103,453

 
105,820

Accumulated depreciation

 
(96,284
)
 
(97,820
)
Total property and equipment, net

 
$
7,169

 
$
8,000


Capitalized Software Development
Capitalized software development is amortized on a straight-line basis over the estimated useful life of the asset, typically three years. Capitalized software development costs were $3.6 million and $5.3 million for the three and six months ended June 30, 2020 and no capitalized costs were recorded for the three and six months ended June 30, 2019. There was no amortization expense with respect to software development costs for the six months ended June 30, 2020 and 2019.