10. Geographical Information

The Company’s principal markets include North America, Asia and Europe. The Company’s foreign operations are conducted primarily through its wholly-owned subsidiaries in China, Singapore and the Czech Republic. Sales by geographic area represent sales to unaffiliated customers and are based upon the location to which the products were shipped. The following table sets forth revenue by geographic area (in thousands):

	Three Months Ended
	March 30,		March 31,
	2018		2017
United States	$	184,775	$	104,356
China		2,166		12,947
Singapore		102,633		60,240
Austria		13,535		11,221
Other		11,733		15,830
	$	314,842	$	204,594

At March 30, 2018, approximately $10.6 million and $1.6 million of the Company’s net long-lived assets were located in Asia and the Czech Republic, respectively, and the remaining balances were located in the United States. At March 31, 2017, approximately $6.9 million and $1.6 million of the Company’s net long-lived assets were located in Asia and the Czech Republic, respectively, and the remaining balances were located in the United States.