Accounts receivable and revenue concentrations

9 Months Ended

Sep. 30, 2012

Accounts Receivable and revenue concentrations [Abstract]

Accounts receivable and revenue concentrations

2. Accounts receivable and revenue concentrations

Four customers accounted for 10%, 13%, 22% and 37%, respectively, of gross accounts receivable as of September 30, 2012. Three customers accounted for 11%, 13% and 67%, respectively, of gross accounts receivable as of September 30, 2011.

Two customers accounted for 14% and 28% of total revenue for the three months ended September 30, 2012. One customer accounted for 66% of total revenue for the three months ended September 30, 2011.

Three customers accounted for 10%, 12% and 26% of total revenue for the nine months ended September 30, 2012. One customer accounted for 37% of total revenue for the nine months ended September 30, 2011.