Property and Equipment |
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| Property and Equipment | 4. Property and Equipment Property and equipment consisted of the following as of:
Amortization expense related to the capitalized internally-developed software was $1.6 million, $1.4 million and $1.5 million for the years ended December 31, 2015, 2014 and 2013, respectively, and is included in technology and content development costs in the accompanying consolidated statements of operations. The net book value of capitalized internally-developed software was $4.5 million and $3.3 million at December 31, 2015 and 2014, respectively. Depreciation and amortization expense of property and equipment (inclusive of amortization expense related to the capitalized internally-developed software) was $2.7 million, $2.4 million and $2.1 million for the years ended December 31, 2015, 2014 and 2013, respectively. As of December 31, 2015, the estimated future depreciation and amortization expense for property and equipment is as follows (in thousands):
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