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Summary of Significant Accounting Policies - Major customers as a percentage of net accounts receivable balances (Details)
Dec. 31, 2012
Dec. 31, 2011
Company A
    
Percent of net accounts receivable balances 16.00% 33.00%
Threshold percentage for disclosure 10.00% 10.00%
Company B
    
Percent of net accounts receivable balances 28.00% 11.00%
Threshold percentage for disclosure 10.00% 10.00%
Company C
    
Percent of net accounts receivable balances 12.00% 10.00%
Threshold percentage for disclosure 10.00% 10.00%
Company D
    
Percent of net accounts receivable balances 12.00%   
Threshold percentage for disclosure 10.00% 10.00%
Company E
    
Percent of net accounts receivable balances 11.00%   
Threshold percentage for disclosure 10.00% 10.00%