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Revenues - Summary of Net Revenues Disaggregated by Category (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Revenue	$ 88,796	$ 63,401
Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	54,459	45,517
Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	34,337	17,884
Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member]
Disaggregation of Revenue [Line Items]
Revenue	72,865	50,506
Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member] | Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	43,808	35,739
Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	29,057	14,767
Stocking Distributors, Net of Sales Allowances [Member]
Disaggregation of Revenue [Line Items]
Revenue	14,685	12,684
Stocking Distributors, Net of Sales Allowances [Member] | Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	10,547	9,622
Stocking Distributors, Net of Sales Allowances [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	4,138	3,062
Non-recurring Engineering [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,175	193
Non-recurring Engineering [Member] | Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	104	156
Non-recurring Engineering [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,071	37
Royalties [Member]
Disaggregation of Revenue [Line Items]
Revenue	53
Royalties [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	53
Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	18	18
Other [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 18	$ 18

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+ References

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