The following customers represented 10% or more of the Company’s net revenues for the respective three months ended March 31, 2022 and 2021, respectively:



Customer	March 31, 2022		March 31, 2021
Distributor A	39	%	40	%
Distributor B	13		14	%
Distributor C	31	%	32	%

The Company considers the domicile of its end customers, rather than the distributors it sells to directly, to be the basis for attributing revenues from external customers to individual countries. Revenues for the three months ending March 31, 2022 and 2021, were attributable to end customers in the following countries:



Country	March 31, 2022		March 31, 2021
China	58	%	86	%
United States	33		4
Taiwan	5		—
Korea	4		8
All others	—		2
Total	100	%	100	%

The following customers represented 10% or more of accounts receivable:


Customer	March 31, 2022		December 31, 2021
Distributor A	26	%	44	%
Distributor B	*		14	%
Distributor C	12	%	14	%
Distributor D	12	%	*
Distributor E	10	%	*
Distributor F	21	%	*

*Total customer accounts receivable was less than 10% of net accounts receivables.