Revenues (Tables)

12 Months Ended

Dec. 31, 2020

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,
	2020		2019		2018
Product Sales
Products transferred to a customer at a point in time	$	205,849	$	277,841	$	311,102
Products transferred to a customer over time	12,738		11,838		9,482
	$	218,587	$	289,679	$	320,584

	Years ended December 31,
	2020		2019		2018
Service Sales
Service transferred to a customer at a point in time	$	36,732	$	48,593	$	42,932
Service transferred to a customer over time	48,449		43,493		40,111
	$	85,181	$	92,086	$	83,043

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

	Years ended December 31,
	2020		2019		2018
Total Sales to External Customers
United States and Canada	$	119,769	$	151,646	$	156,242
EMEA (1)	91,390		122,279		127,261
Other APAC (1)	51,804		60,796		68,908
China	31,748		32,934		36,130
Other Americas (1)	9,057		14,110		15,086
	$	303,768	$	381,765	$	403,627

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