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Revenues - Summary of Net Revenues Disaggregated by Category (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 78,112	$ 70,772	$ 212,274	$ 199,852
Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	47,693	46,482	139,638	141,112
Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	30,419	24,290	72,636	58,740
Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member]
Disaggregation of Revenue [Line Items]
Revenue	68,338	62,279	178,360	170,020
Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member] | Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	40,916	39,705	116,127	120,496
Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	27,422	22,574	62,233	49,524
Stocking Distributors, Net of Sales Allowances [Member]
Disaggregation of Revenue [Line Items]
Revenue	8,124	8,256	29,198	27,567
Stocking Distributors, Net of Sales Allowances [Member] | Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	6,661	6,522	23,097	19,750
Stocking Distributors, Net of Sales Allowances [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,463	1,734	6,101	7,817
Non-recurring Engineering [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,615	127	4,645	2,081
Non-recurring Engineering [Member] | Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	116	163	414	762
Non-recurring Engineering [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,499	(36)	4,231	1,319
Royalties [Member]
Disaggregation of Revenue [Line Items]
Revenue	17	92	17	128
Royalties [Member] | Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue		92		104
Royalties [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	17		17	24
Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	18	18	54	56
Other [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 18	$ 18	$ 54	$ 56

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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
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