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Revenues - Summary of Net Revenues Disaggregated by Category (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 70,761 | $ 63,355 | $ 134,162 | $ 129,080
Brick Products [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 46,428 | 48,005 | 91,945 | 94,630
Advanced Products [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 24,333 | 15,350 | 42,217 | 34,450
Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 59,516 | 53,027 | 110,022 | 107,741
Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member] | Brick Products [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 39,472 | 40,843 | 75,211 | 80,791
Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member] | Advanced Products [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 20,044 | 12,184 | 34,811 | 26,950
Stocking Distributors, Net of Sales Allowances [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 8,390 | 10,029 | 21,074 | 19,311
Stocking Distributors, Net of Sales Allowances [Member] | Brick Products [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 6,814 | 7,111 | 16,436 | 13,228
Stocking Distributors, Net of Sales Allowances [Member] | Advanced Products [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,576 | 2,918 | 4,638 | 6,083
Non-recurring Engineering [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 2,837 | 281 | 3,030 | 1,954
Non-recurring Engineering [Member] | Brick Products [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 142 | 51 | 298 | 599
Non-recurring Engineering [Member] | Advanced Products [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 2,695 | 230 | 2,732 | 1,355
Royalties [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  |  | 36
Royalties [Member] | Brick Products [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  |  | 12
Royalties [Member] | Advanced Products [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  |  | 24
Other [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 18 | 18 | 36 | 38
Other [Member] | Advanced Products [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 18 | $ 18 | $ 36 | $ 38

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