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Debt Additional Details (Details) - USD ($)
3 Months Ended 9 Months Ended
Jan. 30, 2020
Mar. 01, 2019
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Oct. 12, 2017
Jul. 31, 2016
Oct. 15, 2015
Jan. 05, 2015
Debt Instrument [Line Items]                      
Membership interest   1.25%                  
Long-term debt, fair value     $ 267,538,000   $ 267,538,000   $ 246,091,000        
Carrying value     257,163,000   257,163,000   253,256,000        
Gain (loss) included in earnings         500,000            
Gain (loss) on change in fair value of debt     610,000 $ (1,450,000) 2,104,000 $ (2,511,000)          
Change in fair value of debt attributable to instrument-specific credit risk     (951,000) $ 658,000 (2,646,000) $ 1,002,000          
Current interest payable     7,400,000   7,400,000            
Bank loans                      
Debt Instrument [Line Items]                      
Long-term debt, fair value     13,887,000   13,887,000   3,829,000        
Carrying value     10,757,000   10,757,000   3,917,000        
Notes payable                      
Debt Instrument [Line Items]                      
Long-term debt, fair value     203,086,000   203,086,000   192,239,000        
Carrying value     195,841,000   195,841,000   199,316,000        
Mortgage                      
Debt Instrument [Line Items]                      
Debt face amount                 $ 180,000,000    
Interest rate                 4.07%    
Long-term debt, fair value     185,368,000   185,368,000   174,265,000   $ 191,700,000    
Unamortized premium                 $ 11,700,000    
Carrying value     179,394,000   179,394,000   182,548,000        
PWSC Loan | Bank loans                      
Debt Instrument [Line Items]                      
Debt face amount               $ 5,000,000.0      
Interest rate               5.00%      
Long-term debt, fair value     1,856,000   1,856,000   3,829,000        
Carrying value     1,877,000   1,877,000   3,917,000        
KWH Loan | Bank loans                      
Debt Instrument [Line Items]                      
Debt face amount   $ 10,000,000.0                  
Proceeds from issuance of debt   400,000                  
Unamortized discount (premium), net   $ 1,000,000                  
Long-term debt, fair value     12,031,000   12,031,000   0        
Carrying value     8,880,000   8,880,000   0        
KWH Loan | LIBOR | Bank loans                      
Debt Instrument [Line Items]                      
Annual interest rate   9.25%                  
Flower Note | Notes payable                      
Debt Instrument [Line Items]                      
Debt face amount                     $ 9,200,000
Interest rate                     4.81%
Long-term debt, fair value     8,269,000   8,269,000   8,565,000        
Carrying value     7,447,000   7,447,000   7,768,000        
Net Lease Note | Notes payable                      
Debt Instrument [Line Items]                      
Debt face amount                   $ 9,000,000  
Interest rate                   10.25%  
Long-term debt, fair value     9,449,000   9,449,000   9,409,000        
Carrying value     $ 9,000,000   $ 9,000,000   $ 9,000,000        
Forecast | PWSC Loan | Bank loans                      
Debt Instrument [Line Items]                      
Repayments of debt $ 300,000