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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES (Additional Information) (Details)
 1 Months Ended 12 Months Ended
Jan. 01, 2021
USD ($)
Jan. 01, 2020
USD ($)
Jan. 01, 2019
USD ($)
Feb. 28, 2021
MT
Jan. 31, 2021
item
Dec. 31, 2020
USD ($)
item
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Apr. 19, 2021
USD ($)
Liquidity risk                  
Excess of current liabilities over current assets           $ 103,900,000      
Capital commitments for purchases of property, plant and equipment $ 27,500,000         $ 56,300,000      
Capacity Of Polysilicon       35,000 70,000 30,000      
Amount of subsequent contracts signed                 $ 329,000,000.0
Restricted cash                  
Restricted cash           $ 41,800,000 $ 62,600,000    
Inventories                  
Inventory write-down           1,956,000 327,000 $ 900,000  
Property, Plant and Equipment                  
Interest expense capitalized           300,000 6,600,000 1,200,000  
Prepaid land use rights                  
Lease Expenses           700,000 600,000 600,000  
Impairment of long-lived assets                  
Long-lived asset impairment           0 0 11,500,000  
Revenue recognition                  
Accounts Receivable, Net, Current           0 13,300    
Revenue from polysilicon sales           675,602,000 349,991,000 301,600,000  
Government subsidies                  
Unrestricted cash government subsidies           500,000 5,600,000 13,100,000  
Government grants related to fixed assets           400,000 0 0  
Foreign currency translation                  
Aggregate amount of cash and cash equivalents and restricted cash denominated in RMB           117,500,000 113,100,000    
Noncontrolling interest                  
Noncontrolling interest           31,792,000 515,000    
Allocated Share-based Compensation Expense           17,908,000 17,897,000 13,788,000  
Contract with Customer, Liability           41,048,000 35,182,000    
Contract with Customer, Liability, Revenue Recognized   $ 33,000,000.0 $ 10,200,000            
CONCENTRATION OF CUSTOMERS                  
Allowance for doubtful accounts           0 0    
Investment In Affiliate [Abstract]                  
Impairment loss           0 0    
Leases                  
Future minimum operating lease commitments           122,000      
Right-of-use assets           119,000 197,000    
Lease liability, current           82,400 85,000    
Lease liability - long-term portion           0 77,000    
Accounts receivable | Credit concentration                  
Revenue recognition                  
Accounts Receivable, Net, Current             13,000    
Customer B                  
Revenue recognition                  
Revenue from polysilicon sales           369,333,000 187,217,000 57,859,000  
Customer A                  
Revenue recognition                  
Revenue from polysilicon sales           126,759,000 84,226,000 115,412,000  
Discontinued Operations                  
Inventories                  
Inventory write-down           2,000,000 300,000 900,000  
Impairment of long-lived assets                  
Long-lived asset impairment           0 0 18,800,000  
Discontinued Operations | Wafer Manufacturing operations                  
Impairment of long-lived assets                  
Long-lived asset impairment               7,300,000  
Shipping and Handling [Member]                  
Shipping and handling                  
Cost of Goods and Services Sold           $ 8,600,000 $ 6,300,000 $ 4,500,000