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Business Segments, Concentration of Credit Risk and Significant Customers - Schedule of Revenue from Shipment of Product and Licensing of its Technologies to Customers by Geographical Location (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Business Segments
Total net revenue	$ 3,066	$ 4,598	$ 6,586	$ 8,806
North America [Member]
Business Segments
Total net revenue	2,587	3,384	5,074	6,741
Japan [Member]
Business Segments
Total net revenue	346	1,128	1,252	1,842
Taiwan [Member]
Business Segments
Total net revenue	54	73	128	156
Rest of world [Member]
Business Segments
Total net revenue	$ 79	$ 13	$ 132	$ 67

X

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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