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Intangible Assets, net
6 Months Ended
Jun. 30, 2019
Intangible Assets, Net (Excluding Goodwill) [Abstract]  
Intangible Assets, Net and Goodwill
Intangible Assets, net
The following table summarizes the Company’s intangible assets as of June 30, 2019 and December 31, 2018:
 
 
Estimated Useful Life (Years)
 
Gross Carrying Amount at December 31, 2018
 
Accumulated Amortization
 
Net Book Value at June 30, 2019
Developed technology
 
13
 
$
18,800

 
$
1,567

 
$
17,233

Customer relationships
 
1
 
270

 
270

 

 
 
 
 
$
19,070

 
$
1,837

 
$
17,233


The Company uses the straight-line method to determine the amortization expense for its definite lived intangible assets. The weighted-average remaining useful life for the intangible assets is 11.9 years. Amortization expense related to the purchased intangible assets was $407 and $284 for the three months ended June 30, 2019 and 2018, respectively, and $837 and $284 for the six months ended June 30, 2019 and 2018, respectively. The table below reflects the future estimated amortization expense for amortizable intangible assets as of June 30, 2019.
 
 
 
Remainder of 2019
 
$
723

2020
 
1,446

2021
 
1,446

2022
 
1,446

2023
 
1,446

Thereafter
 
10,726

Total
 
$
17,233