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Revenues - Summary of Net Revenues Disaggregated by Category (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Revenue	$ 84,911	$ 78,112	$ 269,083	$ 212,274
Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	41,444	47,693	150,255	139,638
Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	43,467	30,419	118,828	72,636
Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member]
Disaggregation of Revenue [Line Items]
Revenue	65,867	68,338	208,990	178,360
Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member] | Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	29,801	40,916	111,223	116,127
Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	36,066	27,422	97,767	62,233
Stocking Distributors, Net of Sales Allowances [Member]
Disaggregation of Revenue [Line Items]
Revenue	13,480	8,124	49,433	29,198
Stocking Distributors, Net of Sales Allowances [Member] | Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	11,405	6,661	38,586	23,097
Stocking Distributors, Net of Sales Allowances [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	2,075	1,463	10,847	6,101
Non-recurring Engineering [Member]
Disaggregation of Revenue [Line Items]
Revenue	4,084	1,615	9,089	4,645
Non-recurring Engineering [Member] | Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	238	116	446	414
Non-recurring Engineering [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	3,846	1,499	8,643	4,231
Royalties [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,462	17	1,518	17
Royalties [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,462	17	1,518	17
Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	18	18	53	54
Other [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 18	$ 18	$ 53	$ 54

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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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