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Other Intangible Assets
 12 Months Ended
Dec. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Other Intangible Assets
OTHER INTANGIBLE ASSETS

The following table present details of our acquired other intangible assets, net:
(In thousands)
 
Gross
 
Accumulated
Amortization
 
Net
As of December 30, 2018:
 
 
 
 
 
 
Patents and purchased technology1
 
$
42,893

 
$
(30,311
)
 
$
12,582

 
 
$
42,893

 
$
(30,311
)
 
$
12,582

 
 
 
 
 
 
 
As of December 31, 2017:
 
 
 
 
 
 
Patents and purchased technology
 
$
52,313

 
$
(26,794
)
 
$
25,519

 
 
$
52,313

 
$
(26,794
)
 
$
25,519

1 In connection with the divestment of our microinverter business on August 9, 2018, we disposed patents and purchased technology with gross amount of $10.2 million and net book value of $4.1 million. Refer to "Note 4. Business Combinations and Divestiture" for further details on the transaction.

Aggregate amortization expense for intangible assets totaled $9.6 million and $19.7 million and $13.0 million for fiscal year 2018, 2017 and 2016, respectively. Aggregate impairment loss for intangible assets amounted to zero, zero and $4.7 million for fiscal year 2018, 2017 and 2016, respectively.

As of December 30, 2018, the estimated future amortization expense related to intangible assets with finite useful lives is as follows:
(In thousands)
 
Amount
Fiscal Year
 
 
2019
 
$
7,819

2020
 
4,749

Thereafter
 
14

Total future amortization expense
 
$
12,582