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Revenues - Summary of Net Revenues Disaggregated by Geography (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 70,772	$ 78,035	$ 199,852	$ 217,500
Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	46,482	51,026	141,112	140,012
Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	24,290	27,009	58,740	77,488
United States [Member]
Disaggregation of Revenue [Line Items]
Revenue	29,555	29,660	89,851	81,702
United States [Member] | Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	25,265	20,508	73,289	55,794
United States [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	4,290	9,152	16,562	25,908
Europe [Member]
Disaggregation of Revenue [Line Items]
Revenue	6,466	8,200	21,477	19,725
Europe [Member] | Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	5,577	7,013	17,960	16,615
Europe [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	889	1,187	3,517	3,110
Asia Pacific [Member]
Disaggregation of Revenue [Line Items]
Revenue	33,385	38,714	84,526	112,333
Asia Pacific [Member] | Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	14,510	22,136	46,908	64,223
Asia Pacific [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	18,875	16,578	37,618	48,110
All Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,366	1,461	3,998	3,740
All Other [Member] | Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,130	1,369	2,955	3,380
All Other [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 236	$ 92	$ 1,043	$ 360

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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