COMMITMENTS AND CONTINGENCIES (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Oct. 16, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Increase in royalties payable		$ 100	$ 100	$ 300	$ 300
Warranty reserve		200		200		$ 200
Subsequent Event [Line Items]
Recorded estimated loss provision		6,900
Unconditional purchase obligations				31,300
Operating lease payments under noncancelable operating leases		$ 10,200		$ 10,200
Subsequent Event
Subsequent Event [Line Items]
Litigation settlement, amount	$ 6,750