Revenues

3 Months Ended

Mar. 31, 2024

Revenue from Contract with Customer [Abstract]

Revenues

5. 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):

	Three Months Ended March 31, 2024
	Brick Products		Advanced Products		Total
United States	$	20,974	$	27,186	$	48,160
Europe		6,857		3,999		10,856
Asia Pacific		12,268		12,052		24,320
All other		493		43		536
	$	40,592	$	43,280	$	83,872

	Three Months Ended March 31, 2023
	Brick Products		Advanced Products		Total
United States	$	21,256	$	13,710	$	34,966
Europe		7,546		4,027		11,573
Asia Pacific		16,847		33,444		50,291
All other		876		110		986
	$	46,525	$	51,291	$	97,816

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

	Three Months Ended March 31, 2024
	Brick Products		Advanced Products		Total
Direct customers, contract manufacturers and    non-stocking distributors	$	20,810	$	21,640	$	42,450
Stocking distributors, net of sales allowances		19,407		9,632		29,039
Non-recurring engineering		375		3,468		3,843
Royalties		—		8,180		8,180
Other		—		360		360
	$	40,592	$	43,280	$	83,872

	Three Months Ended March 31, 2023
	Brick Products		Advanced Products		Total
Direct customers, contract manufacturers and    non-stocking distributors	$	30,486	$	42,013	$	72,499
Stocking distributors, net of sales allowances		15,737		5,052		20,789
Non-recurring engineering		302		2,128		2,430
Royalties		—		2,020		2,020
Other		—		78		78
	$	46,525	$	51,291	$	97,816

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

	March 31, 2024			December 31, 2023			Change
Short-term deferred revenue and customer prepayments	$	(2,684	)	$	(3,157	)	$	473
Long-term deferred revenue		(660	)		(1,020	)		360
Sales allowances		(3,130	)		(3,482	)		352

The Company records deferred revenue, which represents a contract liability, when cash payments are received or due in advance of performance under a contract with a customer. The Company recognized revenue of $360,000 and approximately $1,609,000 for the three months ended March 31, 2024 and 2023, respectively, that was included in deferred revenue at the beginning of the respective period.