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Segment Information (Tables)
9 Months Ended
Sep. 30, 2020
Segment Reporting [Abstract]  
Schedule of Revenue by Geographic Region
Revenue by geographic region, is as follows:
 Three Months EndedNine Months Ended
September 30,September 30,
 2020201920202019
Japan$5,296 $14,119 $21,297 $42,814 
China2,045 2,562 5,850 6,110 
United States384 694 2,483 2,031 
Korea275 15 308 108 
Taiwan120 667 1,019 1,565 
Europe70 — 260 104 
$8,190 $18,057 $31,217 $52,732 
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 EndedNine Months Ended
September 30,September 30,
 2020201920202019
Distributors:
All distributors50 %48 %51 %42 %
Distributor A24 %31 %28 %30 %
End customers: 1
Top five end customers68 %76 %61 %78 %
End customer A40 %46 %38 %49 %
End customer B10 %12 %%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:
September 30,
2020
December 31,
2019
Account X35 %24 %
Account Y39 %42 %
Account Z%26 %