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Revenues - Summary of Net Revenues Disaggregated by Category (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 70,772	$ 78,035	$ 199,852	$ 217,500
Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	46,482	51,026	141,112	140,012
Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	24,290	27,009	58,740	77,488
Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member]
Disaggregation of Revenue [Line Items]
Revenue	62,279	67,777	170,020	191,071
Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member] | Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	39,705	44,269	120,496	123,147
Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	22,574	23,508	49,524	67,924
Stocking Distributors, Net of Sales Allowances [Member]
Disaggregation of Revenue [Line Items]
Revenue	8,256	8,009	27,567	22,858
Stocking Distributors, Net of Sales Allowances [Member] | Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	6,522	6,236	19,750	15,934
Stocking Distributors, Net of Sales Allowances [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,734	1,773	7,817	6,924
Non-recurring Engineering [Member]
Disaggregation of Revenue [Line Items]
Revenue	127	2,207	2,081	3,379
Non-recurring Engineering [Member] | Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	163	513	762	885
Non-recurring Engineering [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	(36)	1,694	1,319	2,494
Royalties [Member]
Disaggregation of Revenue [Line Items]
Revenue	92	24	128	138
Royalties [Member] | Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	92	8	104	46
Royalties [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	0	16	24	92
Other
Disaggregation of Revenue [Line Items]
Revenue	18	18	56	54
Other | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 18	$ 18	$ 56	$ 54

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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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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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