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REVENUE RECOGNITION - DISAGGREGATED REVENUE (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 8,743	$ 6,144	$ 13,865	$ 91,560
Contract with customer, asset, current	7,400		7,400		$ 9,000
Contract assets - long-term	7,136		7,136		$ 7,231
Increase (decrease) in contract with customer, asset			(1,700)
Total royalty and license revenue
Disaggregation of Revenue [Line Items]
Revenue	8,668	5,992	13,715	91,327
Fixed fee license revenue
Disaggregation of Revenue [Line Items]
Revenue	4,254	1,881	5,994	77,637
Per-unit royalty revenue
Disaggregation of Revenue [Line Items]
Revenue	4,414	4,111	7,721	13,690
Development, services, and other revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 75	$ 152	$ 150	$ 233