Quarterly report pursuant to Section 13 or 15(d)

PREPAID EXPENSES AND OTHER CURRENT ASSETS & INTANGIBLE ASSETS - Schedule of Intangible Assets (Details)

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PREPAID EXPENSES AND OTHER CURRENT ASSETS & INTANGIBLE ASSETS - Schedule of Intangible Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
Patents $ 26,070 $ 26,552
Less accumulated amortization (20,075) (18,804)
Intangible assets, net $ 5,995 $ 7,748