SIGNIFICANT ACCOUNTING POLICIES - Narrative (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Jan. 01, 2019
Disaggregation of Revenue [Line Items]
Revenue recognized adjustment	$ (247)	$ (143)	$ (234)	$ (149)	$ (189)	$ (333)	$ (326)	$ 0
Item Effected [Line Items]
Operating lease, right-of-use asset	2,202								$ 2,202	$ 4,048
Operating lease liabilities	$ 3,814								$ 3,814	4,850
Fixed fee license revenue | Minimum
Disaggregation of Revenue [Line Items]
Revenue, payment term									30 days
Fixed fee license revenue | Maximum
Disaggregation of Revenue [Line Items]
Revenue, payment term									45 days
Per-unit royalty revenue | Minimum
Disaggregation of Revenue [Line Items]
Revenue, payment term									30 days
Per-unit royalty revenue | Maximum
Disaggregation of Revenue [Line Items]
Revenue, payment term									60 days
ASU 2016-02
Item Effected [Line Items]
Operating lease, right-of-use asset										4,000
Operating lease liabilities										$ 4,900