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.

	Six Months Ended June 30, 2019
	United States		International		Total
	(In thousands)
Restaurant solutions	$	1,517	$	241	$	1,758
POS Automation and Banking		2,898		23		2,921
Casino and Gaming		6,916		4,198		11,114
Lottery		829		2		831
Printrex		527		100		627
TransAct Services Group		5,035		614		5,649
Total net sales	$	17,722	$	5,178	$	22,900

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 June 30, 2019 or December 31, 2018. For the first six months of 2019, we recognized revenue of $309 thousand related to our contract liabilities at December 31, 2018. Total contract liabilities consist of the following:

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

Customer pre-payments	$	63	$	50
Deferred revenue, current		357		384
Deferred revenue, non-current		206		265
Total contract liabilities	$	626	$	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 June 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 $3.8 million of its remaining performance obligations within the next 12 months, $0.4 million within the next 24 months and the balance of these remaining performance obligations within the next 36 months.