Revenues - Summary of Net Revenues Disaggregated by Category (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Revenue	$ 63,125	$ 70,772	$ 63,355	$ 65,725	$ 73,720	$ 78,035	$ 74,196	$ 65,269	$ 262,977	$ 291,220	$ 227,830
Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue									187,896	186,704
Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue									75,081	104,516
Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member]
Disaggregation of Revenue [Line Items]
Revenue									222,702	254,785
Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member] | Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue									159,135	163,206
Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue									63,567	91,579
Stocking Distributors, Net of Sales Allowances [Member]
Disaggregation of Revenue [Line Items]
Revenue									37,599	31,732
Stocking Distributors, Net of Sales Allowances [Member] | Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue									27,797	22,362
Stocking Distributors, Net of Sales Allowances [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue									9,802	9,370
Non-recurring Engineering [Member]
Disaggregation of Revenue [Line Items]
Revenue									2,457	4,422
Non-recurring Engineering [Member] | Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue									843	1,066
Non-recurring Engineering [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue									1,614	3,356
Royalties [Member]
Disaggregation of Revenue [Line Items]
Revenue									145	210
Royalties [Member] | Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue									121	70
Royalties [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue									24	140
Other [Member]
Disaggregation of Revenue [Line Items]
Revenue									74	71
Other [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue									$ 74	$ 71