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Internal-Use Software Development Costs | 9 Months Ended
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Sep. 30, 2017
Research and Development [Abstract] |
Internal-Use Software Development Costs | Internal-Use Software Development Costs Internal-use software development costs were as follows (in thousands):
|  | September 30, 2017 |  | December 31, 2016
Internal use software development costs, gross |  | $ | 41,902 |  |  | $ | 33,545 |
Less: Accumulated amortization |  | (24,582 | ) |  | (18,006 | )
Internal use software development costs, net |  | $ | 17,320 |  |  | $ | 15,539 |
Capitalized software development costs were $2.9 million and $3.3 million for the three months ended September 30, 2017 and 2016, respectively, and were $8.4 million and $8.8 million for the nine months ended September 30, 2017 and 2016, respectively. Amortization expense with respect to software development costs totaled $2.3 million and $1.7 million for the three months ended September 30, 2017 and 2016, respectively, and $6.6 million and $4.4 million for the nine months ended September 30, 2017 and 2016, respectively. Future amortization expense with respect to capitalized software development costs as of September 30, 2017, is estimated as follows (in thousands):
Years Ending December 31,
2017 |  | $ | 2,409 |
2018 |  | 8,431 |
2019 |  | 5,153 |
2020 |  | 1,327 |
Total amortization expense |  | $ | 17,320 |

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- Definition The entire disclosure for research, development, and computer software activities, including contracts and arrangements to be performed for others and with federal government. Includes costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility and in-process research and development acquired in a business combination consummated during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 730 -URI http://asc.fasb.org/subtopic&trid=2197926 + Details
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