. SEGMENT AND GEOGRAPHIC INFORMATION

The Company operates in

one

reportable segment that includes the design, development, marketing and sale of high-performance analog solutions for the consumer, computing and storage, industrial, automotive and communications markets. The Company’s chief operating decision maker is its Chief Executive Officer, who reviews financial information presented on a consolidated basis for purposes of allocating resources and evaluating financial performance. The Company derives a majority of its revenue from sales to customers located outside North America, with geographic revenue based on the customers’ ship-to locations.

The Company sells its products primarily through

third

-party distributors and value-added resellers, and directly to original equipment manufacturers, original design manufacturers and electronic manufacturing service providers. The following table summarizes those customers with sales equal to or greater than

10%

of the Company's total revenue, or with accounts receivable balances greater than

10%

of the Company’s total accounts receivable:

	Revenue												Accounts Receivable
	Three Months Ended June 30,						Six Months Ended June 30,						June 30,			December 31,
Customer	2018			2017			2018			2017			2018			2017
A (distributor)		20	%		17	%		20	%		17	%		19	%		16	%
B (distributor)		10	%		*			10	%		*			15	%		*
C (value-added reseller)		*			*			*			*			*			15	%

__________________

* Represents less than

10%.

The Company’s agreements with these

third

-party distributors and value-added reseller were made in the ordinary course of business and

may

be terminated with or without cause by these customers with advance notice. Although the Company

may

experience a short-term disruption in the distribution of its products and a short-term decline in revenue if its agreement with any of these customers was terminated, the Company believes that such termination would

not

have a material adverse effect on its financial statements because it would be able to engage alternative distributors, resellers and other distribution channels to deliver its products to end customers within a short period following the termination of the agreement with the customer.

The following is a summary of revenue by geographic regions (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
Country or Region	2018		2017		2018		2017
China	$	81,207	$	62,325	$	154,072	$	118,409
Taiwan		18,150		17,286		34,541		32,161
Europe		12,651		9,593		24,116		17,501
Korea		8,853		8,154		18,640		16,315
Southeast Asia		7,977		6,925		17,002		13,297
Japan		6,486		4,945		12,100		9,771
United States		4,274		2,888		8,029		4,930
Other		163		82		411		176
Total	$	139,761	$	112,198	$	268,911	$	212,560

The following is a summary of revenue by product family (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
Product Family	2018		2017		2018		2017
DC to DC	$	127,496	$	102,187	$	246,765	$	193,611
Lighting Control		12,265		10,011		22,146		18,949
Total	$	139,761	$	112,198	$	268,911	$	212,560

The following is a summary of long-lived assets by geographic regions (in thousands):

	June 30,		December 31,
Country	2018		2017
China	$	95,152	$	89,472
United States		67,116		65,618
Taiwan		16,879		17,238
Bermuda		7,075		7,522
Other		736		388
Total	$	186,958	$	180,238