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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES (Details) (USD $) | 4 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Apr. 22, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Basis of presentation |  |  |  |  |
Short-term loan renewals | $ 22,400,000 |  |  |  |
Additional short-term working capital loans obtained | 4,800,000 |  |  |  |
Average selling price ("ASP") of polysilicon |  | 23 | 60 |  |
Operating loss |  | (88,517,894) | 50,752,147 | 95,633,534 |
Cash flow from operations |  | (10,307,234) | 44,857,910 | 125,623,550 |
Working capital |  | (163,799,978) |  |  |
Cash and cash equivalents |  | 6,679,024 | 92,697,098 | 203,635,798 | 81,414,436
Short-term bank borrowings |  | 51,273,360 |  |  |
Current portion of long-term debt |  | 69,006,400 | 59,470,875 |  |
Concentration of credit risk |  |  |  |  |
Accounts receivable, allowance for doubtful accounts |  | 1,592,467 | 1,202,940 |  |
Accounts receivable |  | 27,822,799 | 19,081,566 |  |
Percentage of revenues from major customers |  | 24.00% | 46.00% | 26.00% |
Restricted cash |  |  |  |  |
Restricted cash |  | 10,649,745 | 11,600,321 |  |
Inventories |  |  |  |  |
Inventory write-down |  | 14,821,620 | 14,252,701 |  |
Property, plant and equipment |  |  |  |  |
Interest expense capitalized |  | 7,245,747 | 3,429,496 | 233,640 |
Prepaid land use rights |  |  |  |  |
Lease Expenses |  | 958,558 | 166,355 | 150,853 |
Impairment of long-lived assets |  |  |  |  |
Long-lived asset impairment |  | 42,754,481 | 38,512,376 |  |
Impairment charges included in loss from discontinued operations |  |  | 3,844,799 |  |
Revenue recognition |  |  |  |  |
Revenue of other products |  | 19,862,424 | 36,916,531 | 24,764,173 |
Shipping and handling |  |  |  |  |
Shipping and handling costs |  | 1,033,808 | 1,215,110 | 1,030,695 |
Government subsidies |  |  |  |  |
Unrestricted cash government subsidies |  | 9,250,296 | 11,484,768 | 3,382,819 |
Government grants related to assets |  | 1,383,487 | 25,895,226 |  |
Government grants recognized as an offset to depreciation expense |  | 764,528 | 42,047 |  |
Deferred government subsidies |  | 26,472,135 | 25,853,179 |  |
Share-based compensation |  |  |  |  |
Share-based compensation |  | 2,249,834 | 2,206,025 | 1,614,755 |
Earnings per share |  |  |  |  |
Share options |  |  |  | 92,456 |
Foreign currency translation |  |  |  |  |
Aggregate amount of cash and cash equivalents and restricted cash denominated in RMB |  | 11,589,702 | 84,853,361 |  |
Selling, general and administrative expenses [Member] |  |  |  |  |
Share-based compensation |  |  |  |  |
Share-based compensation |  | 2,018,817 | 2,068,115 | 1,513,137 |
Research and development expenses [Member] |  |  |  |  |
Share-based compensation |  |  |  |  |
Share-based compensation |  | 175,242 | 75,508 | 96,827 |
Cost of sales [Member] |  |  |  |  |
Share-based compensation |  |  |  |  |
Share-based compensation |  | 55,775 | 62,402 | 4,791 |
Buildings and plant [Member] |  |  |  |  |
Property, plant and equipment |  |  |  |  |
Estimated useful lives |  | 20 years |  |  |
Machinery and equipment [Member] |  |  |  |  |
Property, plant and equipment |  |  |  |  |
Estimated useful lives |  | 10 years |  |  |
Furniture, fixtures and equipment [Member] | Minimum [Member] |  |  |  |  |
Property, plant and equipment |  |  |  |  |
Estimated useful lives |  | 3 years |  |  |
Furniture, fixtures and equipment [Member] | Maximum [Member] |  |  |  |  |
Property, plant and equipment |  |  |  |  |
Estimated useful lives |  | 5 years |  |  |
Motor vehicles [Member] |  |  |  |  |
Property, plant and equipment |  |  |  |  |
Estimated useful lives |  | 6 years |  |  |
Customer A [Member] |  |  |  |  |
Concentration of credit risk |  |  |  |  |
Accounts receivable |  | 12,529,889 | 2,655,592 |  |
Customer C [Member] |  |  |  |  |
Concentration of credit risk |  |  |  |  |
Accounts receivable |  | 3,568,910 | 2,549,318 |  |
Customer H [Member] |  |  |  |  |
Concentration of credit risk |  |  |  |  |
Accounts receivable |  |  | 5,947,325 |  |
Customer D [Member] |  |  |  |  |
Concentration of credit risk |  |  |  |  |
Accounts receivable |  | $ 1,842,310 | $ 2,823,130 |  |

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- Definition The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-BRD -Paragraph 80 -Subparagraph Exhibit 4-8, 3 -IssueDate 2006-05-01 -Chapter 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 + Details
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- Definition Cost incurred during the reporting period in transporting goods and services to customers. Includes freight-out costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 45 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6408413&loc=d3e221937-122793 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18726-107790 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 22 -Paragraph 8 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 00-10 -Paragraph 6 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Shipping Costs -URI http://asc.fasb.org/extlink&oid=6525344 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Handling Costs -URI http://asc.fasb.org/extlink&oid=6514758 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 45 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6408196&loc=d3e61069-111654 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 45 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=21915142&loc=d3e60635-111653 + Details
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