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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

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