6. Contract assets and contract liabilities

The opening and closing balances of our contract asset, net, contract liability, net, and receivables balances from contracts with customers for the six months ended June 30, 2018 are as follows:

	Contract assets, net			Contract liabilities, net
Balance at January 1, 2018	$	798		$	204,472
Balance at June 30, 2018	217			202,896

Change	$	(581	)	$	(1,576	)

The current and non-current portions of our contract assets, net are included within prepaid expenses and other current assets and other assets, respectively, and current and non-current portions of our contract liabilities, net are included within deferred revenue and deferred revenue, net of current portion, respectively, in our condensed consolidated balance sheets. Contract assets, net are generated from our wholesale Wi-Fi contracts and the change in the contract assets, net balance includes activity related to amounts invoiced offset by revenue recognized from performance obligations satisfied in the current reporting period.

Contract liabilities are recorded when fees are collected or we have an unconditional right to consideration (a receivable) in advance of delivery of goods or services. The change in contract liabilities, net balance is related to customer activity associated with each of our product offerings including the receipt of cash payments and the satisfaction of our performance obligations. Revenues for the three and six months ended June 30, 2018 include the following:

	Three Months Ended June 30, 2018		Six Months Ended June 30, 2018
Amounts included in the beginning of period contract liability balance	$	23,598	$	50,292
Amounts associated with performance obligations satisfied in previous periods	97		190

As of June 30, 2018, the aggregate amount of the transaction price allocated to remaining service performance obligations for our DAS contracts was $190,219. We expect to recognize this revenue as service is provided over the remaining contract term. As of June 30, 2018, our DAS contracts have a remaining duration of less than one year to sixteen years.

Certain of our wholesale Wi-Fi contracts include variable consideration based on usage. This variable consideration has been excluded from the disclosure of remaining performance obligations. As of June 30, 2018, the aggregate amount of the transaction price allocated to remaining service performance obligations for certain of our wholesale Wi-Fi contracts with guaranteed minimum consideration was $7,365. We expect to recognize this revenue as service is provided over the remaining contract term. As of June 30, 2018, our wholesale Wi-Fi contracts have a remaining duration of less than one year to sixteen years.

Information about remaining performance obligations that are part of a contract that has an original expected duration of one year or less have been excluded from the above, which primarily consists of monthly service contracts.