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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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+ 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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