Note 2. Revenues

Disaggregation of Revenue

We sell our products and services primarily in North America and in selected international markets. Revenue by geography is attributed based on the current billing address of the customer. The following table depicts the disaggregation of revenue by geographic region (in thousands):


	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2020		2019		2020		2019
United States
Product sales	$	3,687	$	21,069	$	21,127	$	40,633
Services		917		5,674		4,445		11,455
Total United States		4,604		26,743		25,572		52,088
Canada
Product sales		1,171		8,801		21,978		25,422
Services		329		2,705		8,888		11,080
Total Canada		1,500		11,506		30,866		36,502
Other Countries
Product sales		-		75		1,183		1,122
Services		2,628		1,444		5,661		2,906
Total Other Countries		2,628		1,519		6,844		4,028
Total
Product sales		4,858		29,945		44,288		67,177
Services		3,874		9,823		18,994		25,441
Total revenues	$	8,732	$	39,768	$	63,282	$	92,618

Contract Balances

When the timing of the delivery of products and provision of services is different from the timing of the customer payments, we recognize either a contract asset (performance precedes contractual due date in connection with estimates of variable consideration) or a contract liability (customer payment precedes performance) on our condensed consolidated balance sheet. We currently do not have any contract assets or non-current contract liabilities. The following table includes the current contract liabilities as of June 30, 2020 and December 31, 2019 (in thousands):


Balance at December 31, 2019	$	59
Additions		-
Revenue recognized		(8)
Balance at June 30, 2020	$	51

Our contract liability as of June 30, 2020 and December 31, 2019 is included in current liabilities on our condensed consolidated balance sheet. Our performance obligations for our product and service revenues are satisfied before the customer’s payment however prepayments may occasionally be required for international sales. Revenue recognized from the contract liability balance was $3 thousand and $14 thousand for the three months ended June 30, 2020 and 2019, respectively, and $8 thousand and $0.5 million for the six months ended June 30, 2020 and 2019, respectively.

Practical Expedient

We do not disclose the value of unsatisfied performance obligations when the related contract has a duration of one year or less or we recognize revenue equal to what we have the right to invoice when that amount corresponds directly with the value to the customer of our performance to date.