Inventories consist of the following:


	December 31, 2023		December 31, 2022
	(in thousands)
Finished goods	$	43,579	$	70,407
Raw materials		440		845
Total inventories	$	44,019	$	71,252

Property and equipment, net consists of the following:


	December 31, 2023			December 31, 2022
	(in thousands)
Machinery and equipment	$	2,597		$	2,373
Software and software development		2,438			2,396
Furniture and fixtures		1,700			1,713
Tooling		11,250			9,901
Leasehold improvements		1,988			2,050
Demonstration units and convention booths		15,767			15,379
Total property and equipment, gross		35,740			33,812
Less: accumulated depreciation and amortization		(30,916	)		(27,450	)
Total property and equipment, net	$	4,824		$	6,362

Depreciation and amortization expense on property and equipment for the years ended December 31, 2023, 2022 and 2021 was $3.8 million, $4.6 million and $4.1 million, respectively.

Other current liabilities consist of the following:


	December 31, 2023		December 31, 2022
	(in thousands)
Accrued employee expenses	$	3,944	$	4,171
Accrued marketing		3,335		4,147
Accrued royalty		5,275		2,527
Accrued tax-related payables		5,206		4,159
Accrued freight		2,917		1,746
Accrued expenses		8,747		8,683
Total other current liabilities	$	29,424	$	25,433

Other non-operating expense (income), net consists of the following:


	Year Ended
	December 31,
	2023		2022		2021
	(in thousands)
Change in fair value of contingent consideration	$	—	$	—	$	(1,928	)
Other non-operating expense (income)		394		1,753		1,827
Total other non-operating expense (income),net	$	394	$	1,753	$	(101	)