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				Six Months Ended
	June 29,		June 30,		June 29,		June 30,
	2018		2017		2018		2017
United States	$	159,187	$	129,349	$	343,962	$	233,705
China		16,812		5,166		18,978		18,113
Singapore		82,904		73,810		185,537		134,050
Austria		16,393		8,491		29,929		19,712
Other		14,917		11,445		26,649		27,275
	$	290,213	$	228,261	$	605,055	$	432,855

At June 29, 2018, approximately $10.0 million and $1.5 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 June 30, 2017, approximately $6.5 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.