The following table provides information about disaggregated revenue by primary geographical market and includes a reconciliation of the disaggregated revenue with reportable segments (in thousands):

	Three Months Ended September 30, 2019						Three Months Ended September 30, 2018
	Partner Solutions		Edge to Cloud		Total		Partner Solutions		Edge to Cloud		Total
Primary geographical markets:
North America	$	10,851	$	1,863	$	12,714	$	13,715	$	1,726	$	15,441
Europe		164		177		341		526		148		674
Asia		1,541		45		1,586		—		579		579
Total	$	12,556	$	2,085	$	14,641	$	14,241	$	2,453	$	16,694

	Nine Months Ended September 30, 2019						Nine Months Ended September 30, 2018
	Partner Solutions		Edge to Cloud		Total		Partner Solutions		Edge to Cloud		Total
Primary geographical markets:
North America	$	33,363	$	5,918	$	39,281	$	45,115	$	7,794	$	52,909
Europe		1,004		496		1,500		1,821		681		2,502
Asia		2,974		162		3,136		361		803		1,164
Total	$	37,341	$	6,576	$	43,917	$	47,297	$	9,278	$	56,575

We receive payments from customers based upon contractual billing schedules; accounts receivable is recorded when the right to consideration becomes unconditional. Contract assets include amounts related to our contractual right to consideration for completed performance obligations not yet invoiced and deferred contract acquisition costs, which are amortized over time as the associated revenue is recognized. Contract liabilities, presented as deferred revenue on our condensed consolidated balance sheets, include payments received in advance of performance under the contract and are realized when the associated revenue is recognized. We had no asset impairment charges related to contract assets for each of the three and nine months ended September 30, 2019 and 2018.

Significant changes in the contract assets and the deferred revenue balances during the three and nine months ended September 30, 2019 were as follows (in thousands):

	Three Months Ended September 30, 2019				Nine Months Ended September 30, 2019
	Contract Assets		Contract Liabilities		Contract Assets		Deferred Revenue
Revenue recognized that was included in deferred revenue at December 31, 2018	$	204	$	—	$	1,189	$	984
Transferred to receivables from contract assets recognized at December 31, 2018		—		—		302		—

We capitalize contract acquisition costs for contracts with a life exceeding one year, as was common with our DataV^TM software bookings. Amortization of contract acquisition costs was $35,000 and $7,000 for the three months ended September 30, 2019 and 2018, respectively, and was $42,000 and $93,000 for the nine months ended September 30, 2019 and 2018, respectively. There were no asset impairment charges for contract acquisition costs for any of the periods noted above.

The following table includes estimated revenue expected to be recognized in the future related to performance obligations that are unsatisfied or partially unsatisfied at the end of the reporting period (in thousands). The estimated revenue does not include contracts with original durations of one year or less, amounts of variable consideration attributable to royalties, or contract renewals that are unexercised as of September 30, 2019:

We apply a practical expedient and fully expense contract acquisition costs, such as sales commissions, as incurred because the amortization period is less than one year. We record these costs within selling, general and administrative expenses.