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Summary of Disaggregated Revenue by Primary Geographical Market, Major Product Line and Timing (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 17,494 | $ 20,575 | $ 35,063 | $ 41,862
Licensing and Related Revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 10,038 | 10,337 | 20,121 | 19,872
Royalties |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 7,456 | 10,238 | 14,942 | 21,990
Transferred at Point in Time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 15,217 |  | 30,227 |
Transferred at Point in Time | Licensing and Related Revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 7,761 |  | 15,285 |
Transferred at Point in Time | Royalties |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 7,456 |  | 14,942 |
Transferred over Time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 2,277 |  | 4,836 |
Transferred over Time | Licensing and Related Revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 2,277 |  | 4,836 |
DSP Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 12,813 |  | 27,066 |
DSP Products | Licensing and Related Revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 6,050 |  | 13,425 |
DSP Products | Royalties |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 6,763 |  | 13,641 |
Connectivity Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 4,681 |  | 7,997 |
Connectivity Products | Licensing and Related Revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 3,988 |  | 6,696 |
Connectivity Products | Royalties |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 693 |  | 1,301 |
United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 2,121 | 3,622 | 3,828 | 4,925
United States | Licensing and Related Revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,824 |  | 3,184 |
United States | Royalties |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 297 |  | 644 |
Europe and Middle East |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 2,713 | 2,253 | 5,166 | 6,184
Europe and Middle East | Licensing and Related Revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,414 |  | 2,752 |
Europe and Middle East | Royalties |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,299 |  | 2,414 |
Asia Pacific |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 12,660 | $ 14,700 | 26,069 | $ 30,753
Asia Pacific | Licensing and Related Revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 6,800 |  | 14,185 |
Asia Pacific | Royalties |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 5,860 |  | $ 11,884 |

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