Summary of Significant Accounting Policies (Details 1)
Jun. 30, 2013
Dec. 31, 2012
Dec. 31, 2011
Customer A [Member]
     
Concentration Percentage Of Accounts Receivable With Customers 14.00% 19.00% 36.00%
Customer B [Member]
     
Concentration Percentage Of Accounts Receivable With Customers 8.00% 6.00% 7.00%
Customer C [Member]
     
Concentration Percentage Of Accounts Receivable With Customers 7.00% 0.00% 12.00%
Customer D [Member]
     
Concentration Percentage Of Accounts Receivable With Customers   1.00% 10.00%