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 June 30,
	2020		2019
Product sales
Product transferred to customers at a point in time	$	39,209	$	68,202
Product transferred to customers over time	3,050		2,843
	$	42,259	$	71,045


	For the Six Months Ended June 30,
	2020		2019
Product sales
Product transferred to customers at a point in time	$	92,764	$	137,176
Product transferred to customers over time	6,020		5,446
	$	98,784	$	142,622


	For the Three Months Ended June 30,
	2020		2019
Service sales
Service transferred to customers at a point in time	$	6,649	$	11,609
Service transferred to customers over time	11,656		10,837
	$	18,305	$	22,446


	For the Six Months Ended June 30,
	2020		2019
Service sales
Service transferred to customers at a point in time	$	17,644	$	23,290
Service transferred to customers over time	23,651		21,196
	$	41,295	$	44,486

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 June 30,
	2020		2019
Total sales to external customers
United States	$	24,445	$	35,161
EMEA ⁽¹⁾	16,720		30,030
Other APAC ⁽¹⁾	10,582		15,387
China	7,485		8,961
Other Americas ⁽¹⁾	1,332		3,952
	$	60,564	$	93,491


	For the Six Months Ended June 30,
	2020		2019
Total sales to external customers
United States	$	57,536	$	71,009
EMEA ⁽¹⁾	40,410		61,130
Other APAC ⁽¹⁾	26,069		30,429
China	12,233		17,256
Other Americas ⁽¹⁾	3,831		7,284
	$	140,079	$	187,108

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