The Company is operated and managed geographically and has production facilities in the United States, Mexico and China. The Company utilizes reportable segment’s site contribution (site revenues minus operating expenses, excluding unrealized foreign exchange gain (loss) on unsettled forward exchange contracts, corporate allocations and restructuring expenses) to monitor reportable segment performance. Site contribution is utilized by the chief operating decision-maker as the indicator of reportable segment performance, as it reflects costs which our operating site management is directly responsible for. Intersegment adjustments reflect intersegment sales that are generally recorded at prices that approximate arm’s-length transactions. In assessing the performance of the reportable segments, management attributes site revenue to the reportable segment that ships the product to the customer, irrespective of the product’s destination. Information about the reportable segments is as follows:

 

		Three months ended								Nine months ended
		September 30 , 201 8				October 1 , 201 7				September 30 , 201 8				October 1 , 201 7
Revenues
Mexico		$	40,485			$	23,907			$	105,139			$	70,394
China			8,073				6,934				19,092				23,031
U.S.			8,581				6,319				19,167				15,229
Total		$	57,139			$	37,160			$	143,398			$	108,654
Intersegment revenue
Mexico		$	(1,206	)		$	—			$	(1,944	)		$	(12	)
China			(2,183	)			(2,640	)			(5,962	)			(7,810	)
U.S.			(73	)			(103	)			(216	)			(242	)
Total		$	(3,462	)		$	(2,743	)		$	(8,122	)		$	(8,064	)
Net external revenue
Mexico		$	39,279			$	23,907			$	103,195			$	70,382
China			5,890				4,294				13,130				15,221
U.S.			8,508				6,216				18,951				14,987
Total segment revenue (which also equals consolidated revenue)		$	53,677			$	34,417			$	135,276			$	100,590
Site Contribution
Mexico		$	3,552			$	2,346			$	9,267			$	5,031
China			556				146				998				(1,028	)
U.S.			214				(55	)			175				(2,169	)
Total		$	4,322			$	2,437			$	10,440			$	1,834
Corporate allocations			2,878				2,237				8,249				7,686
Unrealized foreign exchange (gain) loss on unsettled forward exchange contracts			(108	)			118				(338	)			(1,438	)
Interest			485				229				1,195				625
Restructuring charges			58				326				154				1,677
Earnings (loss) before income tax expense		$	1,009			$	(473	)		$	1,180			$	(6,716	)

 

 

The following table contains additions to property, plant and equipment including those acquired through capital leases for the and months ended and

 

		Three months ended								Nine months ended
		September 30 , 2018				October 1 , 2017				September 30 , 2018				October 1 , 2017
Mexico		$	1,287			$	220			$	3,663			$	400
China			190				59				198				134
U.S.			21				171				579				480
Segment total			1,498				450				4,440				1,014
Corporate and other			7				—				117				124
Total		$	1,505			$	450			$	4,557			$	1,138

 

 

		September 30 , 201 8				December 3 1, 2017
Mexico		$	9,469			$	7,518
China			1,242				1,380
U.S			1,472				1,188
Segment total			12,183				10,086
Corporate and other			168				183
Segment assets		$	12,351			$	10,269

 

 

 

The following table contains geographic revenues based on the product shipment destination, for the and months ended and

 

		Three months ended								Nine months ended
		September 30 , 2018				October 1 , 2017				September 30 , 2018				October 1 , 2017
U.S.		$	43,324			$	27,044			$	108,153			$	77,219
Canada			7,413				4,390				20,431				14,894
China			2,940				1,488				6,692				3,844
Africa			—				1,495				—				4,633
Total		$	53,677			$	34,417			$	135,276			$	100,590

 

Sales of the Company’s products are concentrated in certain cases among specific customers in the same industry. The Company is subject to concentrations of credit risk in trade receivables. The Company considers concentrations of credit risk in establishing the allowance for doubtful accounts and believes the recorded allowances are adequate.

 

The Company expects to continue to depend upon a relatively small number of customers for a significant percentage of its revenue. In addition to having a limited number of customers, the Company manufactures a limited number of products for each customer. If the Company loses any of its larger customers or any product line manufactured for of its larger customers, it could experience a significant reduction in revenue. Also, the insolvency of or more of its larger customers or the inability of or more of its larger customers to pay for its orders could decrease revenue. As many costs and operating expenses are relatively fixed, a reduction in net revenue can decrease profit margins and adversely affect the business, financial condition and results of operations.

 

As of customers exceeded of total revenues representing and respectively ( customers represented and ) of total revenue for the quarter of During the months ended customers individually comprised and ( customers individually comprised and ) of total revenue for the period. other customers exceeded of the Company’s revenue in either period.

 

As of customers represented and ( customers represented and ), respectively of the Company’s trade accounts receivable. other customers exceeded of the Company’s trade accounts receivable.