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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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