saggregation of Revenue

Based on the information provided to and reviewed by the Company’s Chief Executive Officer, the Company believes that the nature, amount, timing, and uncertainty of its revenue and cash flows and how they are affected by economic factors is most appropriately depicted through the Company’s primary geographical markets and subscription product categories. The Company’s primary geographical markets are North and South America (“Americas”); Europe, Middle East and Africa (“EMEA”); and Asia Pacific. The Company also disaggregates its subscription products between its MongoDB Atlas-related offerings, which includes mLab, and other subscription products, which includes MongoDB Enterprise Advanced.

The following table presents the Company’s revenues disaggregated by primary geographical markets, subscription product categories and services (in thousands):



	Years Ended January 31,
	2019		2018 *As Adjusted		2017 *As Adjusted
Primary geographical markets:
Americas	$	172,688	$	110,616	$	78,442
EMEA	79,757		48,129		32,800
Asia Pacific	14,571		7,283		3,563
Total	$	267,016	$	166,028	$	114,805

Subscription product categories and services:
MongoDB Atlas-related	$	60,241	$	11,265	$	726
Other subscription	188,150		140,588		103,307
Services	18,625		14,175		10,772
Total	$	267,016	$	166,028	$	114,805

* See Note 2 for a summary of adjustments.

Customers located in the United States accounted for 61%, 63% and 66% of total revenue for the years ended January 31, 2019, 2018 and 2017, respectively. Customers located in the United Kingdom accounted for 10%, 11% and 11% of total revenue for the years ended January 31, 2019, 2018 and 2017, respectively. No other country accounted for 10% or more of revenue for the periods presented.

As of January 31, 2019 and 2018, substantially all of the Company’s long-lived assets were located in the United States.

Contract Liabilities

The Company’s contract liabilities are recorded as deferred revenue in the Company’s consolidated balance sheet and consists of customer invoices issued or payments received in advance of revenues being recognized from the Company’s subscription and services contracts. Deferred revenue, including current and non-current balances as of January 31, 2019, 2018 and 2017 was $137.7 million, $100.9 million and $68.5 million, respectively. For the years ended January 31, 2019 and 2018, revenue recognized from deferred revenue at the beginning of each period was $84.4 million and $59.0 million, respectively.

Remaining Performance Obligations

Remaining performance obligations represent the aggregate amount of the transaction price in contracts allocated to performance obligations not delivered, or partially undelivered, as of the end of the reporting period. Remaining performance obligations include unearned revenue, multi-year contracts with future installment payments and certain unfulfilled orders against accepted customer contracts at the end of any given period. As of January 31, 2019, the aggregate transaction price allocated to remaining performance obligations was $173.1 million. Approximately 53% is expected to be recognized as revenue over the next 12 months and the remainder thereafter. The Company applied the practical expedient to omit disclosure with respect to the amount of the transaction price allocated to remaining performance obligations if the related contract has a total duration of 12 months or less.

Unbilled Receivables

Revenue recognized in excess of invoiced amounts creates an unbilled receivable, which represents the Company’s unconditional right to consideration in exchange for goods or services that the Company has transferred to the customer. Unbilled receivables were recorded as part of accounts receivable, net in the Company’s consolidated balance sheets. As of January 31, 2019, 2018 and 2017, unbilled receivables were $8.0 million, $3.8 million and $3.6 million, respectively.

Costs Capitalized to Obtain Contracts with Customers

The company capitalizes the incremental costs that are directly associated with non-cancelable subscription contracts with customers and consist of sales commissions paid to the Company’s sales force, which were recorded as deferred commissions and other assets, depending on the expected length of the deferral, in the Company’s consolidated balance sheets.

Deferred commissions were $48.6 million and $32.5 million as of January 31, 2019 and 2018, respectively. Amortization expense with respect to deferred commissions was $14.1 million, $9.9 million, and $6.3 million for years ended January 31, 2019, 2018, and 2017, respectively. There was no impairment loss in relation to the costs capitalized for the periods presented.