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Internal Use Software Development Costs
12 Months Ended
Dec. 31, 2015
Research and Development [Abstract]  
Internal Use Software Development Costs
Internal Use Software Development Costs
Internal use software development costs were as follows:

 
 
December 31, 2015
 
December 31, 2014
 
 
 
 
 
 
 
(in thousands)
Internal use software development costs, gross
 
$
27,265

 
$
20,926

Accumulated amortization
 
(13,336
)
 
(9,425
)
Internal use software development costs, net
 
$
13,929

 
$
11,501


During the years ended December 31, 2015, 2014 and 2013, the Company capitalized $9.2 million, $9.4 million, and $4.1 million of internal use software development costs. Amortization expense was $6.7 million, $5.1 million, and $2.7 million for the years ended December 31, 2015, 2014, and 2013. In the years ended December 31, 2015, 2014, and 2013, amortization expense included the write-off of software development costs, net, of $1.5 million, $0.7 million, and $0.2 million respectively. Based on the Company’s internal use software development costs at December 31, 2015, estimated amortization expense of $6.5 million, $4.9 million, $2.4 million, and $0.2 million is expected to be recognized in 2016, 2017, 2018, and 2019, respectively.
There were no impairment charges to internal use software development costs for the years ended December 31, 2015, 2014 and 2013.