Segment Information (Tables)

6 Months Ended

Jun. 30, 2020

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,
	2020		2019		2020		2019
Japan	$	7,515	$	15,234	$	16,001	$	28,694
China	959		1,686		3,805		3,548
United States	433		623		2,099		1,337
Europe	185		71		190		104
Taiwan	161		380		899		899
Korea	—		33		33		93
	$	9,253	$	18,027	$	23,027	$	34,675

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,
	2020		2019		2020		2019
Distributors:
All distributors	65	%	45	%	51	%	36	%
Distributor A	54	%	37	%	29	%	30	%
End customers: 1
Top five end customers	73	%	81	%	61	%	80	%
End customer A	25	%	45	%	37	%	50	%
End customer B	14	%	7	%	7	%	5	%
End customer C	13	%	7	%	5	%	5	%
End customer D	11	%	9	%	6	%	6	%
End customer E	10	%	12	%	5	%	14	%

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, 2020		December 31, 2019
Account X	63	%	24	%
Account Y	15	%	42	%
Account Z	—	%	26	%