| Property and equipment |
6. Property and equipment The following is a summary of property and equipment, at cost less accumulated depreciation and amortization: | | | | | | | | | September 30, | | December 31, | | | 2019 | | 2018 | Leasehold improvements | | $ | 534,794 | | $ | 474,808 | Construction in progress | | | 72,552 | | | 40,369 | Software | | | 57,912 | | | 51,534 | Computer equipment | | | 15,986 | | | 14,215 | Furniture, fixtures and office equipment | | | 2,142 | | | 2,141 | Total property and equipment | | | 683,386 | | | 583,067 | Less: accumulated depreciation and amortization | | | (321,510) | | | (268,888) | Total property and equipment, net | | $ | 361,876 | | $ | 314,179 |
Depreciation and amortization expense, which includes depreciation and amortization for property and equipment under finance leases, is allocated as follows in the accompanying condensed consolidated statements of operations: | | | | | | | | | | | | | | | Three Months Ended | | Nine Months Ended | | | September 30, | | September 30, | | | 2019 | | 2018 | | 2019 | | 2018 | Network access | | $ | 9,463 | | $ | 11,531 | | $ | 30,527 | | $ | 35,252 | Network operations | | | 4,361 | | | 4,447 | | | 13,069 | | | 13,017 | Development and technology | | | 2,782 | | | 2,664 | | | 8,369 | | | 7,740 | General and administrative | | | 261 | | | 259 | | | 785 | | | 760 | Total depreciation and amortization of property and equipment | | $ | 16,867 | | $ | 18,901 | | $ | 52,750 | | $ | 56,769 |
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