Segment Information (Tables)

6 Months Ended

Jun. 30, 2021

Segment Reporting [Abstract]

Schedule of Revenue by Geographic Region

Revenue by geographic region, is as follows:

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2021		2020		2021		2020
Japan	$	7,415	$	7,515	$	10,959	$	16,001
China	5,772		959		10,049		3,805
United States	417		433		1,183		2,099
Taiwan	376		161		1,042		899
Europe	71		185		71		190
Korea	—		—		17		33
	$	14,051	$	9,253	$	23,321	$	23,027

Schedule of Revenue from Significant Customers

The percentage of revenue attributable to our distributors, top five end customers, and individual distributors or end customers that represented 10% or more of revenue in at least one of the periods presented, is as follows:

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2021		2020		2021		2020
Distributors:
All distributors	51	%	65	%	54	%	51	%
Distributor A	24	%	—	%	28	%	4	%
Distributor B	12	%	54	%	11	%	29	%
End customers: 1
Top five end customers	79	%	73	%	76	%	61	%
End customer A	39	%	25	%	34	%	37	%
End customer B	20	%	—	%	19	%	—	%
End customer C	6	%	11	%	4	%	6	%
End customer D	4	%	14	%	5	%	7	%
End customer E	1	%	13	%	1	%	5	%
End customer F	—	%	10	%	—	%	5	%

1End customers include customers who purchase directly from us, as well as customers who purchase our products indirectly through distributors.

Schedule of Accounts Receivable Percentage from Significant Customers

The following accounts represented 10% or more of total accounts receivable in at least one of the periods presented:

	June 30, 2021		December 31, 2020
Account X	56	%	39	%
Account Y	24	%	20	%