Note 15 - Credit Risk and Concentrations

Financial instruments that subject the Company to credit risk consist principally of trade accounts receivable and cash and cash equivalents. The Company performs certain credit evaluation procedures and does not require collateral for financial instruments subject to credit risk. The Company believes that credit risk is limited because the Company routinely assesses the financial strength of its customers and, based upon factors surrounding the credit risk of its customers, establishes an allowance for uncollectible accounts and, as a consequence, believes that its accounts receivable credit risk exposure beyond such allowances is limited.

The Company maintains cash deposits with financial institutions, which, from time to time, may exceed federally insured limits. Cash is also maintained at a foreign financial institution for its majority-owned subsidiary. Cash in foreign financial institutions as of September 30, 2015 and December 31, 2014 was immaterial. The Company has not experienced any losses and believes it is not exposed to any significant credit risk from cash.

The following table sets forth the percentages of revenue derived by the Company from those customers which accounted for at least 10% of revenues during the nine months ended September 30, 2015 and 2014 (in thousands):

The following table sets forth the percentages of revenue derived by the Company from those customers which accounted for at least 10% of revenues during the three months ended September 30, 2015 and 2014 (in thousands):

As of September 30, 2015, Customer A represented approximately 11%, and Customer B represented approximately 8% of total accounts receivable. As of September 30, 2014, Customer A represented approximately 9%, and Customer B represented approximately 8% of total accounts receivable. 

As of September 30, 2015, one vendor represented approximately 54% of total gross accounts payable. Purchases from this vendor during the three months ended September 30, 2015 were $5 million. Purchases from this vendor during the nine months ended September 30, 2015 were $17.7 million.  As of September 30, 2014, one vendor represented approximately 43% of total gross accounts payable. Purchases from this vendor during the three months ended September 30, 2014 were $4.7 million. Purchases from this vendor during the nine months ended September 30, 2014 were $18.9 million.

For the three months ended September 30, 2015, one vendor represented approximately 61% of total purchases. For the nine months ended September 30, 2015, two vendors represented approximately 62% and 11% of total purchases. For the three months ended September 30, 2014, two vendors represented approximately 42% and 25% of total purchases. For the nine months ended September 30, 2014, three vendors represented approximately 51%, 17% and 12% of total purchases.