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Revenue - Summary of Net Revenues Disaggregated by Category (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 63,355 | $ 74,196 | $ 129,080 | $ 139,465
Brick Products [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 48,005 | 48,349 | 94,630 | 88,986
Advanced Products [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 15,350 | 25,847 | 34,450 | 50,479
Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 53,027 | 66,534 | 107,741 | 123,294
Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member] | Brick Products [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 40,843 | 43,404 | 80,791 | 78,878
Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member] | Advanced Products [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 12,184 | 23,130 | 26,950 | 44,416
Stocking Distributors, Net of Sales Allowances [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 10,029 | 6,943 | 19,311 | 14,849
Stocking Distributors, Net of Sales Allowances [Member] | Brick Products [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 7,111 | 4,735 | 13,228 | 9,698
Stocking Distributors, Net of Sales Allowances [Member] | Advanced Products [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 2,918 | 2,208 | 6,083 | 5,151
Non-recurring Engineering [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 281 | 662 | 1,954 | 1,172
Non-recurring Engineering [Member] | Brick Products [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 51 | 197 | 599 | 372
Non-recurring Engineering [Member] | Advanced Products [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 230 | 465 | 1,355 | 800
Royalties [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 39 | 36 | 114
Royalties [Member] | Brick Products [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 13 | 12 | 38
Royalties [Member] | Advanced Products [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 26 | 24 | 76
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 18 | 18 | 38 | 36
Other | Advanced Products [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 18 | $ 18 | $ 38 | $ 36

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