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


	Three months ended June 30,				Six months ended June 30,
	2023		2022		2023		2022
Revenue:
Products (1)	$	49,062	$	28,588	$	95,829	$	40,787
Services	1,532		785		2,773		1,465
	$	50,594	$	29,373	$	98,602	$	42,252

(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 June 30,				Six months ended June 30,
	2023		2022		2023		2022
Cost of sales:
Tangible goods sold	$	41,878	$	27,379	$	83,407	$	37,167
Services	156		105		296		53
Other	4,656		4,194		9,114		7,816
	$	46,690	$	31,678	$	92,817	$	45,036

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 June 30,				Six months ended June 30,
	2023		2022		2023		2022
Cost of sales:
Cost of sales for external customers	$	16,445	$	13,830	$	27,743	$	24,598
Cost of sales for related parties	30,245		17,848		65,074		20,438
	$	46,690	$	31,678	$	92,817	$	45,036