The following tables present our revenues by sales type as presented in our condensed consolidated statements of operations disaggregated by the timing of transfer of goods or services (in thousands, unaudited):


	For the Three Months Ended September 30,
	2020		2019
Product sales
Product transferred to customers at a point in time	$	44,561	$	63,806
Product transferred to customers over time	3,521		2,982
	$	48,082	$	66,788


	For the Nine Months Ended September 30,
	2020		2019
Product sales
Product transferred to customers at a point in time	$	137,324	$	200,982
Product transferred to customers over time	9,542		8,429
	$	146,866	$	209,411


	For the Three Months Ended September 30,
	2020		2019
Service sales
Service transferred to customers at a point in time	$	9,623	$	12,361
Service transferred to customers over time	13,031		11,367
	$	22,654	$	23,728


	For the Nine Months Ended September 30,
	2020		2019
Service sales
Service transferred to customers at a point in time	$	27,268	$	35,650
Service transferred to customers over time	36,681		32,563
	$	63,949	$	68,213

The following table presents our revenues disaggregated by geography, based on the billing addresses of our customers (in thousands, unaudited):


	For the Three Months Ended September 30,
	2020		2019
Total sales to external customers
United States	$	28,865	$	37,166
EMEA (1)	20,648		26,424
Other APAC (1)	11,463		16,120
China	7,758		7,751
Other Americas (1)	2,002		3,055
	$	70,736	$	90,516


	For the Nine Months Ended September 30,
	2020		2019
Total sales to external customers
United States	$	86,401	$	108,174
EMEA (1)	61,058		87,554
Other APAC (1)	37,532		46,550
China	19,991		25,007
Other Americas (1)	5,833		10,339
	$	210,815	$	277,624

(1) Regions represent Europe, the Middle East, and Africa (EMEA); Asia-Pacific, excluding China (Other APAC); and Canada, Mexico, and Brazil (Other Americas).