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Internal-Use Software Development Costs
9 Months Ended
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