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Intangible Assets and Goodwill (Tables)
 3 Months Ended
Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Intangible Assets
The details of the intangibles are as follows:
 
March 31, 2018
(in thousands)
Average amortization period
 
Gross carrying amount
 
Accumulated amortization
 
Net value
 
Amortizing intangible assets:
 
 
 
 
 
 
 
Patents
5 yrs
 
$
3,971

 
$
(1,610
)
 
$
2,361

Arbor acquired technology
3 yrs
 
670

 
(670
)
 
—

Direct nanoparticle deposition technology
6 yrs
 
558

 
(558
)
 
—

 
 
 
$
5,199

 
$
(2,838
)
 
$
2,361

 
December 31, 2017
(in thousands)
Average amortization period
 
Gross carrying amount
 
Accumulated amortization
 
Net value
 
Amortizing intangible assets:
 
 
 
 
 
 
 
Patents
5 yrs
 
$
3,310

 
$
(1,474
)
 
$
1,836

Arbor acquired technology
3 yrs
 
670

 
(670
)
 
—

Direct nanoparticle deposition technology
6 yrs
 
543

 
(543
)
 
—

 
 
 
$
4,523

 
$
(2,687
)
 
$
1,836
Schedule of Estimated Future Amortization Expense
Estimated amortization expense for the remainder of 2018 and subsequent years is as follows:
(in thousands)
2018
$
489

2019
612

2020
539

2021
413

2022
266

Thereafter
42

 
$
2,361