In the following tables, sales are disaggregated by category, sales by geographic market and sales by product data. The following breaks down sales into the following categories (in thousands):

	Three Months Ended
	April 3, 2020		March 29, 2019
Non-consignment sales	$	30,400	$	28,266
Consignment sales		4,787		4,317
Total net sales	$	35,187	$	32,583

The Company markets and sells its products in over 75 countries and conducts its manufacturing in the United States. Other than China and Japan, the Company does not conduct business in any country in which its sales exceed 10% of worldwide consolidated net sales. Sales are attributed to countries based on location of customers. The composition of the Company’s net sales to unaffiliated customers was as follows (in thousands):

Note 14 — Disaggregation of Sales, Geographic Sales and Product Sales (Continued)

	Three Months Ended
	April 3, 2020		March 29, 2019
Domestic	$	1,739	$	1,952
Foreign:
China	$	11,715	$	11,771
Japan		8,302		5,519
Other⁽¹⁾		13,431		13,341
Total foreign sales		33,448		30,631
Total net sales	$	35,187	$	32,583

100% of the Company’s sales are generated from the ophthalmic surgical product segment and the chief operating decision maker makes operating decisions and allocates resources based upon the consolidated operating results, and therefore the Company operates as one operating segment for financial reporting purposes. The Company’s principal products are implantable Collamer lenses (“ICLs”) used in refractive surgery and intraocular lenses (“IOLs”) used in cataract surgery. The composition of the Company’s net sales by product line was as follows (in thousands):

	Three Months Ended
	April 3, 2020		March 29, 2019
ICLs	$	29,340	$	27,786
Other product sales
IOLs		3,994		4,017
Other surgical products		1,853		780
Total other product sales		5,847		4,797
Total net sales	$	35,187	$	32,583

One customer, the Company’s distributor in China, accounted for 33% and 36% of net sales for the three months ended April 3, 2020 and March 29, 2019, respectively. As of April 3, 2020 and January 3, 2020, respectively, one customer, the Company’s distributor in China, accounted for 48% and 43% of consolidated trade receivables.