Information about Geographic Areas

12 Months Ended

Dec. 31, 2018

The following table is based on the geographic location of distributors or end users who purchased products and services and collaborators. For sales to distributors, their geographic location may be different from the geographic locations of the ultimate end user. Revenue by geography as of December 31 was as follows (in thousands):



	2018		2017		2016
Americas	$	74,137	$	86,099	$	60,330
Europe & Middle East	25,715		21,791		18,497
Asia Pacific	6,880		7,015		7,662
Total revenue	$	106,732	$	114,905	$	86,489

Total revenue in the United States was $71.2 million, $84.0 million, and $58.0 million for the years ended December 31, 2018, 2017, and 2016, respectively. The Company’s assets are primarily located in the United States and not allocated to any specific geographic region. Substantially all of the Company’s long-lived assets are located in the United States.