2. Revenue

We account for revenue in accordance with ASC Topic 606: Revenue from Contracts with Customers.

Disaggregation of revenue

The following table disaggregates our revenue by market-type, as we believe it best depicts how the nature, amount, timing and uncertainty of our revenue and cash flows are affected by economic factors. Sales and usage-based taxes are excluded from revenues.

	Three Months Ended						Three Months Ended
	September 30, 2019						September 30, 2018
	(In thousands)
	United States		International		Total		United States		International		Total
Restaurant Solutions	$	1,730	$	221	$	1,951	$	1,326	$	155	$	1,481
POS automation and banking		1,494		20		1,514		1,910		23		1,933
Casino and gaming		2,849		2,225		5,074		5,733		2,534		8,267
Lottery		95		–		95		655		–		655
Printrex		213		83		296		304		147		451
TSG		2,490		266		2,756		2,739		312		3,051
Total net sales	$	8,871	$	2,815	$	11,686	$	12,667	$	3,171	$	15,838

	Nine Months Ended						Nine Months Ended
	September 30, 2019						September 30, 2018
	(In thousands)
	United States		International		Total		United States		International		Total
Restaurant Solutions	$	3,825	$	462	$	4,287	$	3,609	$	327	$	3,936
POS automation and banking		4,392		43		4,435		5,765		136		5,901
Casino and gaming		9,765		6,423		16,188		14,084		7,190		21,274
Lottery		924		2		926		1,724		47		1,771
Printrex		740		183		923		833		229		1,062
TSG		6,947		880		7,827		8,180		708		8,888
Total net sales	$	26,593	$	7,993	$	34,586	$	34,195	$	8,637	$	42,832

Contract balances

Our contract liabilities consist of customer pre-payments and deferred revenue. Customer prepayments are reported as “Accrued Liabilities” in current liabilities in the Condensed Consolidated Balance Sheets. Customer prepayments represent customer payments made in advance of performance obligations in instances where credit has not been extended and are recognized as revenue when the performance obligation is complete. Deferred revenue is reported separately in current liabilities and non-current liabilities and consists of our extended warranty contracts, technical support for our restaurant solution terminals, prepaid subscription revenue for our BOHA! software, EPICENTRAL™ maintenance contracts and testing service contracts, and is recognized as revenue as (or when) we perform under the contract. We do not have any contract asset balances as of September 30, 2019 or December 31, 2018. For the first nine months of 2019, we recognized revenue of $489 thousand related to our contract liabilities at December 31, 2018. Total contract liabilities consist of the following:

	September 30, 2019		December 31, 2018
	(In thousands)

Customer pre-payments	$	69	$	50
Deferred revenue, current		517		384
Deferred revenue, non-current		190		265
Total contract liabilities	$	776	$	699

Remaining performance obligations

Remaining performance obligations represent the transaction price of firm orders for which a good or service has not been delivered to our customer. As of September 30, 2019, the aggregate amount of the transaction price allocated to remaining performance obligations was $4.3 million. The Company expects to recognize revenue on $4.1 million of its remaining performance obligations within the next 12 months, $0.1 million within the next 24 months and the balance of these remaining performance obligations within the next 36 months.