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Accounts Receivable and Revenue Concentrations
9 Months Ended
Sep. 30, 2011
Accounts receivable and revenue concentrations [Abstract] 
Accounts receivable and revenue concentrations
2.Accounts receivable and revenue concentrations
  
Three customers accounted for 11%, 13% and 67%, respectively, of gross accounts receivable as of September 30, 2011. Three customers accounted for 13%, 23% and 52%, respectively, of gross accounts receivable as of September 30, 2010.
  
One customer accounted for 66% of total revenue for the three months ended September 30, 2011. One customer accounted for 21% of total revenue for the three months ended September 30, 2010.
  
One customer accounted for 37% of total revenue for the nine months ended September 30, 2011. Two customers accounted for 14% and 50% of total revenue for the nine months ended September 30, 2010.