Revenues

12 Months Ended

Dec. 31, 2023

Revenue from Contract with Customer [Abstract]

Revenues

10. REVENUES

The following tables present the Company’s net revenues disaggregated by geography based on the location of the customer, by product line (in thousands):

	Year Ended December 31, 2023
	Brick Products		Advanced Products		Total
United States	$	82,400	$	67,056	$	149,456
Europe		31,792		27,950		59,742
Asia Pacific		63,631		128,636		192,267
All other		3,343		251		3,594
	$	181,166	$	223,893	$	405,059

	Year Ended December 31, 2022
	Brick Products		Advanced Products		Total
United States	$	76,306	$	53,116	$	129,422
Europe		27,856		10,522		38,378
Asia Pacific		49,076		179,259		228,335
All other		2,520		424		2,944
	$	155,758	$	243,321	$	399,079

	Year Ended December 31, 2021
	Brick Products		Advanced Products		Total
United States	$	74,280	$	44,360	$	118,640
Europe		32,762		5,145		37,907
Asia Pacific		80,344		120,459		200,803
All other		1,758		256		2,014
	$	189,144	$	170,220	$	359,364

The following tables present the Company’s net revenues disaggregated by the category of revenue, by product line (in thousands):

	Year Ended December 31, 2023
	Brick Products		Advanced Products		Total
Direct customers, contract manufacturers and non-stocking    distributors	$	113,448	$	163,549	$	276,997
Stocking distributors, net of sales allowances		66,544		29,893		96,437
Non-recurring engineering		1,174		13,421		14,595
Royalties		—		15,872		15,872
Other		—		1,158		1,158
	$	181,166	$	223,893	$	405,059

	Year Ended December 31, 2022
	Brick Products		Advanced Products		Total
Direct customers, contract manufacturers and non-stocking    distributors	$	102,905	$	216,685	$	319,590
Stocking distributors, net of sales allowances		51,819		13,831		65,650
Non-recurring engineering		1,034		9,933		10,967
Royalties		—		2,801		2,801
Other		—		71		71
	$	155,758	$	243,321	$	399,079

	Year Ended December 31, 2021
	Brick Products		Advanced Products		Total
Direct customers, contract manufacturers and    non-stocking distributors	$	139,099	$	144,180	$	283,279
Stocking distributors, net of sales allowances		49,359		14,123		63,482
Non-recurring engineering		686		10,027		10,713
Royalties		—		1,819		1,819
Other		—		71		71
	$	189,144	$	170,220	$	359,364

The following table presents the changes in certain contract assets and (liabilities) (in thousands):

	December 31, 2023			December 31, 2022			Change
Short-term deferred revenue and customer prepayments	$	(3,157	)	$	(13,197	)	$	10,040
Long-term deferred revenue		(1,020	)		(145	)		(875	)
Deferred expenses		—			577			(577	)
Sales allowances		(3,482	)		(1,661	)		(1,821	)

Deferred expenses are included in Other current assets, in the accompanying Consolidated Balance Sheets.

During 2023, 2022, and 2021, one customer accounted for approximately 10.7%, 12.4%, and 14.9% of net revenues, respectively, which included net revenues from both business product lines in each of the three years.

Net revenues from customers in Taiwan accounted for approximately 14.6% of total net revenues in 2023, 26.4% in 2022 and 16.1% in 2021, respectively.

Net revenues from customers in China (including Hong Kong), accounted for approximately 17.7% of total net revenues in 2023, 18.8% in 2022 and 27.5% in 2021, respectively.