| Property and equipment |
6. Property and equipment The following is a summary of property and equipment, at cost less accumulated depreciation and amortization: | | | | | | | | | June 30, | | December 31, | | | 2019 | | 2018 | Leasehold improvements | | $ | 520,923 | | $ | 474,808 | Construction in progress | | | 60,117 | | | 40,369 | Software | | | 56,360 | | | 51,534 | Computer equipment | | | 15,381 | | | 14,215 | Furniture, fixtures and office equipment | | | 2,148 | | | 2,141 | Total property and equipment | | | 654,929 | | | 583,067 | Less: accumulated depreciation and amortization | | | (304,757) | | | (268,888) | Total property and equipment, net | | $ | 350,172 | | $ | 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 | | Six Months Ended | | | June 30, | | June 30, | | | 2019 | | 2018 | | 2019 | | 2018 | Network access | | $ | 9,482 | | $ | 10,134 | | $ | 21,064 | | $ | 23,721 | Network operations | | | 4,322 | | | 4,314 | | | 8,708 | | | 8,570 | Development and technology | | | 2,808 | | | 2,568 | | | 5,587 | | | 5,076 | General and administrative | | | 262 | | | 246 | | | 524 | | | 501 | Total depreciation and amortization of property and equipment | | $ | 16,874 | | $ | 17,262 | | $ | 35,883 | | $ | 37,868 |
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