Concentration of credit risk

9 Months Ended

Sep. 30, 2011

Concentration of credit risk

Concentration of credit risk

4.     Concentration of credit risk

For the three and nine months ended September 30, 2011, one customer contributed 81% and 85%, respectively, of revenues.  For the three and nine months ended September 30, 2010, one customer contributed 80% and 48%, respectively, of revenues.

Three customers comprised 100% of the accounts receivable balance at September 30, 2011. Three customers comprised 92% of the accounts receivable balance at December 31, 2010.