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Accounts receivable and revenue concentrations
9 Months Ended
Sep. 30, 2013
Accounts Receivable and revenue concentrations [Abstract]  
Accounts receivable and revenue concentrations

2. Accounts receivable and revenue concentrations

The following table summarizes accounts receivable and revenue concentrations:

Accounts Receivable
As of September 30,
Total Revenue
for the three months
ended September 30,
Total Revenue
for the nine months
ended September 30,
201320122013201220132012
Customer #126%
Customer #247%37%31%18%10%
Customer #310%
Customer #413%13%
Customer #522%29%10%
Customer #626%
Customer #710%12%
Total concentration73%82%41%42%30%46%