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Significant Customers, Concentrations of Credit Risk, and Geographic Information (Tables)

6 Months Ended

Jun. 30, 2021

Significant Customers, Concentrations of Credit Risk, and Geographic Information

Schedule of net revenues from customers

​

​	​	​	​	​	​	​	​	​	​
​	​	Three months ended June 30,			​	Six months ended June 30,			​
​		2021		2020		2021	​	2020	​
Customer A		22	%	15	%	25	%	13	%
Customer B		14	%	*	%	*	%	15	%
Customer C		10	%	10	%	*	%	*	%
Customer D		*	%	12	%	12	%	11	%

*    Less than 10% of total net revenues

Schedule of net revenues by geographical area

​

​	​	​	​	​	​	​	​	​	​	​	​	​
​	​	Three months ended June 30,					​	Six months ended June 30,
​		2021			2020			2021			2020
​		(in thousands)
United States	​	$	590	​	$	680	​	$	860	​	$	1,422
Asia and Middle East	​		1,378	​		871	​		2,490	​		1,642
Europe and other	​		96	​		151	​		282	​		329
Revenue, net	​	$	2,064	​	$	1,702	​	$	3,632	​	$	3,393

Schedule of assets by geographical area

​

​	​	​	​	​	​	​
​		June 30,			December 31,
​		2021			2020
​		(in thousands)
United States	​	$	1,191	​	$	1,194
Asia	​		243	​		332
Total long-lived assets	​	$	1,434	​	$	1,526

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