Total revenue disaggregated by revenue source is as follows (in thousands):


	Three months ended September 30,				Nine months ended September 30,
	2023		2022		2023		2022
Revenue:
Products (1)	$	45,865	$	44,574	$	141,695	$	85,356
Services	1,403		1,049		4,175		2,518
	$	47,268	$	45,623	$	145,870	$	87,874

(1) Product revenue includes sales to related parties as described in Note 16, “Related Party Transactions.”

The Company differentiates cost of sales based on whether the cost is attributable to tangible goods sold, cost of services sold or other costs which cannot be directly attributable to either tangible goods or services.

Total cost of sales disaggregated is as follows (in thousands):


	Three months ended September 30,				Nine months ended September 30,
	2023		2022		2023		2022
Cost of sales:
Tangible goods sold	$	33,350	$	43,734	$	116,755	$	80,900
Services	128		126		425		179
Other	4,743		3,605		13,857		11,421
	$	38,221	$	47,465	$	131,037	$	92,500

Other cost of sales represent costs directly associated with the generation of revenue but which cannot be attributed directly to tangible goods sold or services. Examples of other costs of sales are certain personnel costs and equipment rental and insurance costs.

Cost of sales split between external and related party sales is as follows (in thousands):


	Three months ended September 30,				Nine months ended September 30,
	2023		2022		2023		2022
Cost of sales:
Cost of sales for external customers	$	14,399	$	15,820	$	42,471	$	58,265
Cost of sales for related parties	23,822		31,645		88,566		34,235
	$	38,221	$	47,465	$	131,037	$	92,500