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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Operating activities:      
Net income $ 29,523,824 $ 38,765,537 $ 93,855,400
Less: (Loss) income from discontinued operations, net of tax 1,260,790 (23,032,181) (3,821,259)
Net income from continuing operations 28,263,034 61,797,718 97,676,659
Adjustments to reconcile net income to net cash provided by operating activities:      
Share-based compensation 17,896,942 13,788,049 4,200,273
Depreciation of property, plant and equipment 47,371,130 27,718,260 27,801,924
Non-cash lease expense 49,226    
Loss on disposal of property plant and equipment     130,666
Inventory write-down 326,598 0 0
Changes in operating assets and liabilities:      
Accounts receivable 1,162,813 (539,597) 1,172,506
Notes receivable 2,388,577 12,022,847 (10,197,038)
Prepaid expenses and other current assets (5,174,161) (4,699,699) 496,485
Advances to suppliers 1,757,996 (1,914,816) (62,384)
Inventories (21,635,212) (641,481) (7,919,605)
Amount due from related parties   82 212
Prepaid land use rights 582,469 586,034 572,722
Right-of-use assets (247,524)    
Accounts payable 3,660,080 (9,449,164) 4,038,950
Notes payable 78,385,678 (14,204,999) 199,562
Accrued expenses and other current liabilities 2,943,201 (918,399) 4,581,224
Income tax payable (605,281) (7,314,062) 7,253,601
Advances from customers 18,062,953 2,076,037 8,386,416
Amount due to related parties 102,542 8,793 1,000
Deferred government subsidies (170,589) (605,268) (591,519)
Lease liability 163,517    
Deferred taxes 4,696,450 (151,843) (85,302)
Net cash provided by operating activities-continuing operations 179,980,439 77,558,492 137,656,352
Net cash provided by operating activities-discontinued operations 1,010,130 17,994,548 5,048,042
Net cash provided by operating activities 180,990,569 95,553,040 142,704,394
Investing activities:      
Purchases of property, plant and equipment (279,044,684) (143,064,872) (64,084,712)
Purchases of land use rights (6,592,707)    
Investment in an affiliate     (63,793)
Purchase of short-term investments   (37,860,000)  
Repayment of short-term investments 21,726,000 15,144,000  
Acquisition of Xinjian Daqo Investment 627,157 443,579  
Net cash used in investing activities-continuing operations (263,284,234) (165,337,293) (64,148,505)
Net cash (used in) provided by investing activities-discontinued operations 1,456,521 616,988 (3,752,066)
Net cash used in investing activities (261,827,713) (164,720,305) (67,900,571)
Financing activities:      
Proceeds from related parties loans 20,388,371 34,831,200 19,382,389
Repayment of related parties loans (20,388,371) (34,831,200) (19,382,389)
Proceeds from bank borrowings 178,225,620 56,002,512 65,349,400
Repayment of bank borrowings (74,553,606) (59,819,936) (96,200,000)
Proceeds from options exercised 791,493 686,596 2,238,854
Proceeds from follow-on equity offering   113,540,845  
Insurance costs for follow-on equity offering   (6,919,202)  
Paid-in capital received from non-controlling interests 514,512    
Net cash (used in) provided by financing activities-continuing operations 104,978,019 103,490,815 (28,611,746)
Net cash used in financing activities-discontinued operations (2,650,931) (16,778,925) (8,742,573)
Net cash (used in) provided by financing activities 102,327,088 86,711,890 (37,354,319)
Effect of exchange rate changes on cash, cash equivalents and restricted cash (1,315,735) 4,909,097 3,335,715
Net increase in cash, cash equivalents and restricted cash 20,174,209 22,453,722 40,785,219
Cash, cash equivalents and restricted cash at the beginning of the year (includes $3,723,807, $8,952,260 and $1,091,190 of cash, cash equivalents and restricted cash in current assets associated with discontinued operations on December 31, 2016, 2017 and 2018) 95,119,886 72,666,164 31,880,945
Cash, cash equivalents and restricted cash at the end of the year (includes $8,952,260, $1,091,190 and $845,199 of cash, cash equivalents and restricted cash in current assets associated with discontinued operations on December 31, 2017, 2018 and 2019) 115,294,095 95,119,886 72,666,164
Cash and cash equivalents 52,684,734 66,401,408 60,676,605
Restricted cash 62,609,361 28,718,478 11,989,559
Total cash, cash equivalents, and restricted cash shown in the statements of cash flows 115,294,095 95,119,886 72,666,164
Supplemental disclosure of cash flow information:      
Interest paid, net of capitalized interest 10,214,566 10,787,862 16,308,829
Income taxes paid 5,546,373 19,452,799 9,526,485
Supplemental schedule of non-cash investing activities:      
Purchases of property, plant and equipment included in payables 135,701,791 56,153,860 22,018,200
Purchase of property, plant and equipment included in amounts due to related parties - short-term portion 26,539,448 2,240,686 $ 1,825,617
Payables for acquisition of Xinjiang Daqo Investment included in amounts due to related parties - short-term portion 7,899,100    
Payables for acquisition of Xinjiang Daqo Investment included in amounts due to related parties - long-term portion $ 7,899,100 $ 15,991,800