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Summary of Significant Accounting Policies (Details Textual)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 15, 2019
shares
Jun. 02, 2016
USD ($)
Jun. 30, 2019
shares
Sep. 30, 2019
USD ($)
shares
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
renewable_identification_number
Sep. 30, 2018
USD ($)
Dec. 31, 2016
Jan. 31, 2019
USD ($)
Jan. 01, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2014
USD ($)
Business Acquisition [Line Items]                            
Restricted cash       $ 3,000,000 $ 3,000,000 $ 3,000,000 $ 3,000,000       $ 3,000,000      
Goodwill       16,080,000 16,080,000 16,080,000 16,080,000       16,080,000      
Impairment of property, plant and equipment       $ 11,145,000 0 11,613,000 0              
Shares covered by rebalancing call options               100.00%            
Termination of capped call options (in shares) | shares       625,558                    
Retained earnings       $ (299,281,000)   (299,281,000)         (427,244,000)      
Accounting Standards Update 2016-02                            
Business Acquisition [Line Items]                            
Retained earnings                   $ 7,000,000        
December 2017 Program                            
Business Acquisition [Line Items]                            
Security repurchase program, amount authorized to be repurchased                       $ 75,000,000    
June 2018 Program                            
Business Acquisition [Line Items]                            
Security repurchase program, amount authorized to be repurchased         75,000,000   75,000,000              
January 2019 Program                            
Business Acquisition [Line Items]                            
Security repurchase program, amount authorized to be repurchased                 $ 75,000,000          
2036 Senior Convertible Notes Repurchases | Convertible Notes                            
Business Acquisition [Line Items]                            
Face amount   $ 152,000,000                     $ 152,000,000  
Interest rate   4.00%                     4.00%  
Convertible Notes Repurchases   $ 147,118,000   $ 0 17,583,000 $ 0 59,346,000              
Principal amount of debt repurchased         10,000,000   34,500,000              
2036 Senior Convertible Notes Repurchases | Convertible Notes | December 2017 Program                            
Business Acquisition [Line Items]                            
Convertible Notes Repurchases         1,500,000   43,263,000              
2036 Senior Convertible Notes Repurchases | Convertible Notes | June 2018 Program                            
Business Acquisition [Line Items]                            
Convertible Notes Repurchases         16,083,000   16,083,000              
2019 Senior Convertible Notes | Convertible Notes                            
Business Acquisition [Line Items]                            
Face amount                           $ 143,800,000
Interest rate       2.75%   2.75%               2.75%
Convertible Notes Repurchases         0   6,689,000              
Principal amount of debt repurchased         0   6,311,000              
Settlement of 2019 Convertible Senior Notes conversion premium (in shares) | shares 1,902,781     1,902,781                    
Termination of capped call options (in shares) | shares     625,558                      
2019 Senior Convertible Notes | Convertible Notes | December 2017 Program                            
Business Acquisition [Line Items]                            
Convertible Notes Repurchases         0   6,689,000              
2019 Senior Convertible Notes | Convertible Notes | June 2018 Program                            
Business Acquisition [Line Items]                            
Convertible Notes Repurchases         $ 0   $ 0              
Services                            
Business Acquisition [Line Items]                            
Goodwill       $ 16,080,000   $ 16,080,000         $ 16,080,000      
Minimum percentage Increase in fair value of each of the reporting units over its carrying value through annual impairment test           5.00%                
REG New Boston                            
Business Acquisition [Line Items]                            
Impairment of property, plant and equipment       $ 11,145,000                    
Minimum                            
Business Acquisition [Line Items]                            
RINs per gallon | renewable_identification_number           1.5                
Allowed RINs per gallon | renewable_identification_number           0                
Maximum                            
Business Acquisition [Line Items]                            
RINs per gallon | renewable_identification_number           1.7                
Allowed RINs per gallon | renewable_identification_number           2.5