7. Concentrations

Financial Risks — As of December 31, 2017 and 2016, the Company held cash of approximately $56,000 and $67,000 respectively, in the name of its subsidiaries, at banks in Pakistan, India, Sri Lanka and Poland. The banking systems in these countries do not provide deposit insurance coverage. Additionally, from time to time, the Company maintains cash balances at financial institutions in the United States in excess of federal insurance limits. The Company has not experienced any losses on such accounts.

Concentrations of credit risk with respect to trade accounts receivable are managed by periodic credit evaluations of customers. The Company does not require collateral for outstanding trade accounts receivable. As of December 31, 2017, two customers individually accounted for approximately 8% and 6% of accounts receivable respectively. As of December 31, 2016, one customer accounted for approximately 5% of accounts receivable. During the year ended December 31, 2017, there was one customer with sales of approximately 9% of the total revenue. During the year ended December 31, 2016, there were no customers with sales of 3% or more of the total.

Geographical Risks — The Company’s offices in Islamabad and Bagh, Pakistan, and Colombo, Sri Lanka conduct significant back-office operations for the Company. The Company has no revenue earned outside of the United States. The office in Bagh is located in a different territory of Pakistan from the Islamabad office. The Bagh office was opened in 2009 for the purpose of providing operational support and operating as a backup to the Islamabad office. The Company’s operations outside the United States are subject to special considerations and significant risks not typically associated with companies in the United States. The Company’s business, financial condition and results of operations may be influenced by the political, economic, and legal environment in the countries in which it operated and by the general state of these countries’ economies. The Company’s results may be adversely affected by, among other things, changes in governmental policies with respect to laws and regulations, changes in local countries’ telecommunications industries, regulatory rules and policies, anti-inflationary measures, currency conversion and remittance, and rates and methods of taxation.

Carrying amounts of net assets located outside the United States were approximately $157,000 and $288,000 as of December 31, 2017 and 2016, respectively. These balances exclude intercompany receivables of approximately $6.5 million and $5.3 million as of December 31, 2017 and 2016, respectively. The following is a summary of the net assets located outside the United States as of December 31, 2017 and 2016: