Revenues (Tables)

12 Months Ended

Dec. 31, 2019

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

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

	Years ended December 31,
	2019		2018		2017
Product Sales
Products transferred to a customer at a point in time	$	277,841	$	311,102	$	277,922
Products transferred to a customer over time	11,838		9,482		9,326
	$	289,679	$	320,584	$	287,248

	Years ended December 31,
	2019		2018		2017
Service Sales
Service transferred to a customer at a point in time	$	48,593	$	42,932	$	36,164
Service transferred to a customer over time	43,493		40,111		37,505
	$	92,086	$	83,043	$	73,669

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

	Years ended December 31,
	2019		2018		2017
Total Sales to External Customers
United States	$	151,646	$	156,242	$	141,595
EMEA (1)	122,279		127,261		115,061
Other APAC (1)	60,796		68,908		60,325
China	32,934		36,130		30,405
Other Americas (1)	14,110		15,086		13,531
	$	381,765	$	403,627	$	360,917

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