Accounts receivable and revenue concentrations (Tables)

9 Months Ended

Sep. 30, 2013

Accounts Receivable and revenue concentrations [Abstract]

Summary of 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,
	2013	2012	2013	2012	2013	2012
Customer #1	26%
Customer #2	47%	37%	31%		18%	10%
Customer #3		10%
Customer #4		13%		13%
Customer #5		22%		29%		10%
Customer #6						26%
Customer #7			10%		12%
Total concentration	73%	82%	41%	42%	30%	46%