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Debt - Convertible Senior Notes (Details)
$ / shares in Units, shares in Millions
1 Months Ended 6 Months Ended 12 Months Ended
Feb. 14, 2020
USD ($)
$ / shares
shares
Oct. 02, 2018
USD ($)
shares
Sep. 21, 2017
USD ($)
shares
Feb. 28, 2015
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
$ / shares
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Deferred Revenue Arrangement [Line Items]                
Issuance of common shares for debt conversion         $ 13,757,000 $ 0 $ 92,307,000 $ 0
Interest on non-recourse debt         19,288,000 39,929,000 19,791,000 0
Amortization of debt issuance costs         179,000 $ 50,000 1,679,000 730,000
Four Point Seven Five Percent Convertible Senior Notes                
Deferred Revenue Arrangement [Line Items]                
Debt instrument, face amount       $ 100,000,000.0        
Proceeds from debt, net of issuance costs       96,300,000        
Payments of debt issuance costs       $ 3,700,000        
Debt instrument, interest rate, stated percentage       4.75%        
Debt instrument, interest rate, effective percentage           5.48%    
Convertible preferred stock, shares issued upon conversion (in shares) | shares       19.6        
Conversion ratio       195.8336        
Conversion price (in USD per share) | $ / shares       $ 5.11   $ 1,000    
Percentage of principal amount redeemed       100.00%        
Issuance of common shares for debt conversion     $ 80,000,000.0          
Issuance of common stock due to debt conversion (in shares) | shares     16.8          
Convertible beneficial conversion feature (in shares) | shares   0.1 1.1          
Induced conversion of convertible debt expense   $ 900,000 $ 13,000,000.0          
Outstanding balance           $ 7,100,000    
Interest on non-recourse debt         500,000 400,000 3,500,000 5,500,000
Amortization of debt issuance costs         200,000 $ 100,000 1,700,000 $ 700,000
Accelerated amortization of financing costs         $ 100,000   $ 1,400,000  
October 2018 Exchange Agreement                
Deferred Revenue Arrangement [Line Items]                
Issuance of common shares for debt conversion   $ 12,900,000            
Issuance of common stock due to debt conversion (in shares) | shares   2.6            
Subsequent Event | Four Point Seven Five Percent Convertible Senior Notes                
Deferred Revenue Arrangement [Line Items]                
Conversion price (in USD per share) | $ / shares $ 5.11              
Issuance of common stock due to debt conversion (in shares) | shares 1.4              
Outstanding balance $ 7,100,000