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Summary of Disaggregated Revenue by Primary Geographical Market, Major Product Line and Timing (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Revenues	$ 21,413	$ 24,044	$ 56,476	$ 65,906
Licensing and Related Revenue
Disaggregation of Revenue [Line Items]
Revenues	9,786	14,021	29,907	33,893
Royalties
Disaggregation of Revenue [Line Items]
Revenues	11,627	10,023	26,569	32,013
Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenues	18,505		48,732
Transferred at Point in Time | Licensing and Related Revenue
Disaggregation of Revenue [Line Items]
Revenues	6,878		22,163
Transferred at Point in Time | Royalties
Disaggregation of Revenue [Line Items]
Revenues	11,627		26,569
Transferred over Time
Disaggregation of Revenue [Line Items]
Revenues	2,908		7,744
Transferred over Time | Licensing and Related Revenue
Disaggregation of Revenue [Line Items]
Revenues	2,908		7,744
DSP Products
Disaggregation of Revenue [Line Items]
Revenues	15,252		42,318
DSP Products | Licensing and Related Revenue
Disaggregation of Revenue [Line Items]
Revenues	4,652		18,077
DSP Products | Royalties
Disaggregation of Revenue [Line Items]
Revenues	10,600		24,241
Connectivity Products
Disaggregation of Revenue [Line Items]
Revenues	6,161		14,158
Connectivity Products | Licensing and Related Revenue
Disaggregation of Revenue [Line Items]
Revenues	5,134		11,830
Connectivity Products | Royalties
Disaggregation of Revenue [Line Items]
Revenues	1,027		2,328
United States
Disaggregation of Revenue [Line Items]
Revenues	2,259	1,237	6,087	6,162
United States | Licensing and Related Revenue
Disaggregation of Revenue [Line Items]
Revenues	1,483		4,667
United States | Royalties
Disaggregation of Revenue [Line Items]
Revenues	776		1,420
Europe and Middle East
Disaggregation of Revenue [Line Items]
Revenues	6,139	1,267	11,305	7,451
Europe and Middle East | Licensing and Related Revenue
Disaggregation of Revenue [Line Items]
Revenues	534		3,286
Europe and Middle East | Royalties
Disaggregation of Revenue [Line Items]
Revenues	5,605		8,019
Asia Pacific
Disaggregation of Revenue [Line Items]
Revenues	13,015	$ 21,540	39,084	$ 52,293
Asia Pacific | Licensing and Related Revenue
Disaggregation of Revenue [Line Items]
Revenues	7,769		21,954
Asia Pacific | Royalties
Disaggregation of Revenue [Line Items]
Revenues	$ 5,246		$ 17,130

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Section 50
-Paragraph 4
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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