Revenues

12 Months Ended

Dec. 31, 2020

Revenue from Contract with Customer [Abstract]

Revenues

REVENUES

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).

We capitalize commission expenses related to deliverables transferred to a customer over time and amortize such costs ratably over the term of the contract. As of December 31, 2020, the deferred cost asset related to deferred commissions was approximately $4.1 million. For classification purposes, $2.6 million and $1.5 million are comprised within the Prepaid expenses and other current assets and Other long-term assets, respectively, on our consolidated balance sheet as of December 31, 2020. As of December 31, 2019, the deferred cost asset related to deferred commissions was approximately $3.1 million. For classification purposes, $2.1 million and $1.0 million are comprised within the Prepaid expenses and other current assets and Other long-term assets, respectively, on our consolidated balance sheet as of December 31, 2019.

The unearned service revenue liabilities reported on our consolidated balance sheets reflect the contract liabilities to satisfy the remaining performance obligations for extended warranties and software maintenance. The current portion of unearned service revenues on our consolidated balance sheets is what we expect to recognize to revenue within twelve months after the applicable balance sheet date relating to extended warranty and software maintenance contract liabilities. The Unearned service revenues - less current portion on our consolidated balance sheets is what we expect to recognize to revenue extending beyond twelve months after the applicable balance sheet date relating to extended warranty and software maintenance contract liabilities. Customer deposits on our consolidated balance sheets represent customer prepayments on contracts for performance obligations that we must satisfy in the future to recognize the related contract revenue. These amounts are generally related to performance obligations which are delivered in less than 12 months. During the year ended December 31, 2020, we recognized $35.2 million of revenue that was deferred on our consolidated balance sheet as of December 31, 2019. During the year ended December 31, 2019, we recognized $30.2 million of revenue that was deferred on our consolidated balance sheet as of December 31, 2018.

The nature of certain of our contracts gives rise to variable consideration, primarily related to an allowance for sales returns. We are required to estimate the contract asset related to sales returns and record a corresponding adjustment to Cost of Sales. Our allowance for sales returns for December 31, 2020 and December 31, 2019 was approximately $0.3 million and $0.1 million, respectively.

Shipping and handling fees billed to customers in a sales transaction are recorded in Product Sales and shipping and handling costs incurred are recorded in Cost of Sales. We exclude from Sales any value-added, sales and other taxes that we collect concurrently with revenue-producing activities.