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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
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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%

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