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Revenue - Summary of Net Revenues Disaggregated by Category (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 63,355	$ 74,196	$ 129,080	$ 139,465
Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	48,005	48,349	94,630	88,986
Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	15,350	25,847	34,450	50,479
Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member]
Disaggregation of Revenue [Line Items]
Revenue	53,027	66,534	107,741	123,294
Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member] | Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	40,843	43,404	80,791	78,878
Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	12,184	23,130	26,950	44,416
Stocking Distributors, Net of Sales Allowances [Member]
Disaggregation of Revenue [Line Items]
Revenue	10,029	6,943	19,311	14,849
Stocking Distributors, Net of Sales Allowances [Member] | Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	7,111	4,735	13,228	9,698
Stocking Distributors, Net of Sales Allowances [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	2,918	2,208	6,083	5,151
Non-recurring Engineering [Member]
Disaggregation of Revenue [Line Items]
Revenue	281	662	1,954	1,172
Non-recurring Engineering [Member] | Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	51	197	599	372
Non-recurring Engineering [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	230	465	1,355	800
Royalties [Member]
Disaggregation of Revenue [Line Items]
Revenue		39	36	114
Royalties [Member] | Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue		13	12	38
Royalties [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue		26	24	76
Other
Disaggregation of Revenue [Line Items]
Revenue	18	18	38	36
Other | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 18	$ 18	$ 38	$ 36

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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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