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Investments in Other Entities and Noncontrolling Interest in a Subsidiary - NG Advantage (Details) - USD ($)
$ in Thousands
1 Months Ended 4 Months Ended 5 Months Ended 12 Months Ended
Nov. 27, 2019
Jun. 28, 2019
Jun. 11, 2019
Apr. 15, 2019
Feb. 15, 2019
Oct. 01, 2018
Feb. 28, 2018
Dec. 31, 2019
Feb. 28, 2019
Jan. 31, 2019
Dec. 31, 2018
Nov. 30, 2018
Feb. 28, 2019
Nov. 26, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Nov. 11, 2019
May 17, 2019
Jul. 14, 2017
Oct. 14, 2014
Business Acquisition [Line Items]                                          
Payments to acquire additional interest in subsidiaries                                 $ 1,928        
Outstanding balance               $ 88,885     $ 79,715       $ 88,885 $ 79,715          
Income (loss) attributable to noncontrolling interest                             $ (7,162) $ (5,393) (2,154)        
NG Advantage                                          
Business Acquisition [Line Items]                                          
Purchase of interest by parent, shares purchased (in shares)           1,000,001                              
Payments to acquire additional interest in subsidiaries           $ 5,000                              
Ownership interest before transaction (as a percent)           53.50% 53.30%                 63.00%          
Ownership interest after transaction (as a percent)           61.70% 53.50%               64.60%            
Income (loss) attributable to noncontrolling interest                             $ (7,200) $ (5,400) $ (2,200)        
Noncontrolling interest               9,600     $ 17,000       9,600 $ 17,000          
NG Advantage | 2019 Note                                          
Business Acquisition [Line Items]                                          
Debt Instrument, Face Amount         $ 5,000                                
Proceeds from issuance of debt       $ 2,500 $ 2,500                                
NG Advantage | 2019 Bridge Loan                                          
Business Acquisition [Line Items]                                          
Debt Instrument, Face Amount                                     $ 500    
Proceeds from issuance of debt     $ 100                                    
NG Advantage | June 2019 Convertible Note                                          
Business Acquisition [Line Items]                                          
Debt Instrument, Face Amount   $ 15,200                                      
Proceeds from issuance of debt   $ 3,500                       $ 7,400              
Number of common units to be called by warrants (in shares)   86,879                                      
NG Advantage | November 2019 Convertible Note                                          
Business Acquisition [Line Items]                                          
Debt Instrument, Face Amount $ 26,700                                        
Proceeds from Convertible Debt $ 3,400             6,600                          
Number of common units to be called by warrants (in shares) 2,000,000                                        
Interest rate (as a percent)                                   12.00%      
Outstanding balance               $ 26,700             $ 26,700            
NG Advantage | Payment Obligations                                          
Business Acquisition [Line Items]                                          
Aggregate payment obligation guaranty             $ 30,000                            
Purchase of interest by parent, shares purchased (in shares)             19,660   100,000 100,000 100,000 100,000 400,000                
NG Advantage                                          
Business Acquisition [Line Items]                                          
Ownership interest (as a percent)                                       53.30% 53.30%
Aggregate value of stock                                       $ 7,500