Revenues (Tables)

3 Months Ended

Mar. 31, 2019

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

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 March 31,
	2019		2018
Product sales
Product transferred to customers at a point in time	$	68,800	$	70,581
Product transferred to customers over time	—		—
	$	68,800	$	70,581

	For the Three Months Ended March 31,
	2019		2018
Service sales
Service transferred to customers at a point in time	$	11,854	$	9,452
Service transferred to customers over time	12,963		12,801
	$	24,817	$	22,253

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 March 31,
	2019		2018
Total sales to external customers
United States	$	35,848	$	37,302
EMEA (1)	31,100		29,680
APAC (1)	23,337		22,589
Other Americas (1)	3,332		3,263
	$	93,617	$	92,834

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