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Related Party Transactions - Additional Information (Details) - USD ($)
1 Months Ended 12 Months Ended
Aug. 31, 2020
Nov. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Mar. 31, 2020
Jul. 01, 2017
Dec. 31, 2012
Related Party Transaction [Line Items]                
Total revenue from related parties     $ 7,562,000 $ 228,100,000 $ 32,381,000      
Interest paid     71,651,000 $ 69,851,000 59,549,000      
Unamortized premium, reclassified to additional paid-in capital     $ 2,300,000          
Convertible promissory notes | Convertible Promissory Notes Interest Rate 6% Due December 2020, Recourse                
Related Party Transaction [Line Items]                
Debt instrument convertible principal   $ 6,900,000            
Interest rate percentage     10.00% 6.00%        
Convertible stock price (in dollars per share)   $ 11.25            
Debt conversion, shares issued (in shares)   616,302            
Convertible debt | Convertible Promissory Notes Interest Rate 6% Due December 2020, Recourse                
Related Party Transaction [Line Items]                
Debt face amount           $ 289,300,000    
Convertible debt | Additional Convertible Notes                
Related Party Transaction [Line Items]                
Debt face amount           $ 30,000,000.0    
Term loan | Term Loan due September 2028, Non-Recourse                
Related Party Transaction [Line Items]                
Interest rate percentage     7.50% 7.50%        
PPA IIIa                
Related Party Transaction [Line Items]                
Repayments of debt     $ 10,513,000 $ 6,631,000 $ 4,431,000      
PPA IIIa | Term loan | Term Loan due September 2028, Non-Recourse                
Related Party Transaction [Line Items]                
Interest rate percentage               7.50%
Debt face amount               $ 46,800,000
NEA | Class B common stock                
Related Party Transaction [Line Items]                
Converted instrument, amount $ 33,900,000              
Conversion of notes (in shares) 4,200,000              
Foris Ventures LLC | Class B common stock                
Related Party Transaction [Line Items]                
Converted instrument, amount $ 10,000,000.0              
Conversion of notes (in shares) 1,300,000              
KPCB | Class B common stock                
Related Party Transaction [Line Items]                
Converted instrument, amount $ 6,900,000              
Conversion of notes (in shares) 900,000              
SK Engineering & Construction Co., Ltd.                
Related Party Transaction [Line Items]                
Total revenue from related parties     4,200,000          
Accounts receivable     0          
Equity Method Investee | Softbank Corp.                
Related Party Transaction [Line Items]                
Accounts receivable     2,400,000 2,400,000        
Affiliated entity | Convertible promissory notes | Convertible Promissory Notes Interest Rate 6% Due December 2020, Recourse                
Related Party Transaction [Line Items]                
Interest rate percentage             6.00%  
Affiliated entity | PPA IIIa | Term loan | Term Loan due September 2028, Non-Recourse                
Related Party Transaction [Line Items]                
Repayments of debt     2,100,000 2,200,000        
Interest paid     700,000 3,000,000.0        
Service | Equity Method Investee | Softbank Corp.                
Related Party Transaction [Line Items]                
Total revenue from related parties     $ 3,400,000 $ 4,200,000