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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES (Details) (USD $) | 12 Months Ended |  | 3 Months Ended
--- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Mar. 31, 2013 Subsequent event Short term bank loan agreements entered into between January 1, 2013 to March 31, 2013 | Mar. 31, 2013 Subsequent event Short term bank loan agreements entered into between January 1, 2013 to March 31, 2013 Repayment due in 2014
SUMMARY OF PRINCIPAL ACCOUNTING POLICIES |  |  |  |  |  |
Net loss | $ 195,155,097 | $ 90,903,374 | $ (50,828,396) |  |  |
Cash used in operations | (147,758,937) | 60,124,114 | (58,487,119) |  |  |
Cash and cash equivalents | 141,968,182 | 343,994,679 | 288,651,701 | 160,110,887 |  |
Restricted cash | 422,356,794 | 178,270,427 |  |  |  |
Bank borrowings due within one year | 858,926,732 | 743,687,062 |  |  |  |
Amount by which current liabilities exceeded current assets | 98,045,603 |  |  |  |  |
Basis of presentation |  |  |  |  |  |
Bank borrowings renewed and drew down |  |  |  |  | 304,583,061 |
Bank borrowings due beyond December 31, 2013 |  |  |  |  |  | 159,438,369
Allowance for doubtful receivables |  |  |  |  |  |
Receivable from Sinosure recorded in prepaid expenses and other current assets | $ 9,515,899 | $ 5,337,282 | $ 4,212,532 |  |  |

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