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Revenues - Summary of Net Revenues Disaggregated by Category (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Revenue	$ 95,376	$ 70,761	$ 184,172	$ 134,162
Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	54,352	46,428	108,811	91,945
Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	41,024	24,333	75,361	42,217
Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member]
Disaggregation of Revenue [Line Items]
Revenue	70,258	59,516	143,123	110,022
Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member] | Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	37,614	39,472	81,422	75,211
Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	32,644	20,044	61,701	34,811
Stocking Distributors, Net of Sales Allowances [Member]
Disaggregation of Revenue [Line Items]
Revenue	21,268	8,390	35,953	21,074
Stocking Distributors, Net of Sales Allowances [Member] | Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	16,634	6,814	27,181	16,436
Stocking Distributors, Net of Sales Allowances [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	4,634	1,576	8,772	4,638
Non-recurring Engineering [Member]
Disaggregation of Revenue [Line Items]
Revenue	3,830	2,837	5,005	3,030
Non-recurring Engineering [Member] | Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	104	142	208	298
Non-recurring Engineering [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	3,726	2,695	4,797	2,732
Royalties [Member]
Disaggregation of Revenue [Line Items]
Revenue	3		56
Royalties [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	3		56
Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	17	18	35	36
Other [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 17	$ 18	$ 35	$ 36

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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

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