XML 30 R19.htm IDEA: XBRL DOCUMENT v3.10.0.1
INTANGIBLE ASSETS (Tables)
 6 Months Ended
Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Intangible Assets
The components of these intangible assets are as follows:
 
June 30,
2018
 
December 31,
2017
 
(in thousands)
Patents
$
26,070

 
$
26,552

Less accumulated amortization
(19,586
)
 
(18,804
)
 
$
6,484

 
$
7,748