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Segment Information
12 Months Ended
Dec. 31, 2020
Segment Reporting [Abstract]  
Segment Information SEGMENT INFORMATION
We have identified a single operating segment: the design and development of ICs for use in electronic display devices. Substantially all of our assets are located in the U.S.
Geographic Information
Revenue by geographic region, was as follows:
 Year Ended December 31,
 20202019
Japan$26,554 $53,628 
China8,935 10,213 
U.S.3,057 3,105 
Taiwan1,668 1,597 
Europe333 104 
Korea308 108 
$40,855 $68,755 

Significant Customers
 
The percentage of revenue attributable to our distributors, top five end customers, and individual distributors or end customers that represented more than 10% of revenue in at least one of the periods presented, is as follows:
 Year Ended December 31,
 20202019
Distributors:
All distributors49 %44 %
Distributor A23 %28 %
End Customers: 1
Top five end customers58 %77 %
End customer A40 %49 %
End customer B%12 %
1 End customers include customers who purchase directly from us, as well as customers who purchase our products indirectly through distributors.
 
Each of the following accounts represented 10% or more of total accounts receivable in at least one of the periods presented:
 December 31,
 20202019
Account X39 %42 %
Account Y20 %26 %
Account Z%24 %