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Related Party Transactions - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Nov. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Mar. 31, 2020
Jul. 01, 2017
Dec. 31, 2012
Related Party Transaction [Line Items]                  
Total revenue from related parties   $ 881,000 $ 81,572,000 $ 1,930,000 $ 82,354,000        
Interest paid       34,487,000 35,702,000        
Softbank Corp. | Equity Method Investee                  
Related Party Transaction [Line Items]                  
Accounts receivable   100,000   100,000   $ 2,400,000      
Softbank Corp. | Equity Method Investee | Service                  
Related Party Transaction [Line Items]                  
Total revenue from related parties   $ 900,000 800,000 $ 1,900,000 1,600,000        
Convertible promissory notes | Convertible Promissory Notes Interest Rate 6% Due December 2020, Recourse                  
Related Party Transaction [Line Items]                  
Debt Instrument, Convertible, Principal Converted $ 6,900,000                
Convertible stock price (in dollars per share) $ 11.25                
Debt conversion, shares issued (in shares) 616,302                
Interest rate percentage           6.00%      
Convertible promissory notes | Convertible Promissory Notes Interest Rate 6% Due December 2020, Recourse | Affiliated entity                  
Related Party Transaction [Line Items]                  
Interest rate percentage               6.00%  
Term loan | Term Loan due September 2028, Non-Recourse                  
Related Party Transaction [Line Items]                  
Interest rate percentage   7.50%   7.50%   7.50%      
Convertible debt | Additional Convertible Notes                  
Related Party Transaction [Line Items]                  
Debt face amount             $ 30,000,000.0    
Interest rate percentage             10.00%    
Convertible debt | Convertible Promissory Notes Interest Rate 6% Due December 2020, Recourse                  
Related Party Transaction [Line Items]                  
Debt face amount   $ 289,300,000   $ 289,300,000          
PPA IIIa                  
Related Party Transaction [Line Items]                  
Repayments of debt       9,293,000   $ 6,631,000      
PPA IIIa | Term loan | Term Loan due September 2028, Non-Recourse                  
Related Party Transaction [Line Items]                  
Debt face amount                 $ 46,800,000
Interest rate percentage                 7.50%
PPA IIIa | Term loan | Term Loan due September 2028, Non-Recourse | Affiliated entity                  
Related Party Transaction [Line Items]                  
Repayments of debt   0 400,000 2,100,000 1,200,000        
Interest paid   $ 0 $ 700,000 $ 700,000 $ 1,500,000