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Debt - Narrative (Details)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 25, 2021
USD ($)
$ / shares
shares
Jan. 12, 2021
Mar. 31, 2021
USD ($)
Mar. 31, 2021
USD ($)
tradingDay
businessDay
shares
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Oct. 20, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jul. 23, 2018
USD ($)
Debt Instrument [Line Items]                  
Inventory     $ 97,371 $ 97,371   $ 49,158      
Cash, cash equivalents, restricted cash and restricted cash equivalents     1,343,045 1,343,045 $ 230,712 945,820   $ 247,448  
Proceeds from issuance of convertible senior notes, net of issuance costs       488,691 0        
Cost incurred       $ 54,450          
Debt Instrument, Redemption, Period Two                  
Debt Instrument [Line Items]                  
Conversion price, percentage       98.00%          
1.75% Convertible Senior Notes due 2023                  
Debt Instrument [Line Items]                  
Aggregated principal amount     23,777 $ 23,777          
Debt conversion       39          
Repurchase amount     1,849 1,849          
0% Convertible Senior Notes due 2025                  
Debt Instrument [Line Items]                  
Aggregated principal amount     661,250 661,250          
0.5% Convertible Senior Notes Due 2027                  
Debt Instrument [Line Items]                  
Aggregated principal amount     500,000 500,000          
Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Net assets     141,067 141,067   65,191      
Inventory     92,914 92,914   47,620      
Cash, cash equivalents, restricted cash and restricted cash equivalents     $ 27,369 27,369   11,818      
Amortization of debt issuance costs       86 154        
Interest expense, debt       $ 340 80        
Western Alliance Bank | Warehouse Agreement Borrowings                  
Debt Instrument [Line Items]                  
Stated Cash Interest Rate     3.25% 3.25%          
Western Alliance Bank | Warehouse Agreement Borrowings | London Interbank Offered Rate (LIBOR)                  
Debt Instrument [Line Items]                  
Debt instrument, basis spread on variable rate       2.00%          
Texas Capital Bank, N.A. | Warehouse Agreement Borrowings                  
Debt Instrument [Line Items]                  
Stated Cash Interest Rate     3.35% 3.35%          
Decrease in rate of interest accruing on outstanding principal       0.25%          
Goldman Sachs Bank USA | Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Debt instrument, term       6 months          
Flagstar Bank, FSB | Warehouse Agreement Borrowings                  
Debt Instrument [Line Items]                  
Stated Cash Interest Rate     3.00% 3.00%          
Facility termination period       30 days          
Flagstar Bank, FSB | Warehouse Agreement Borrowings | London Interbank Offered Rate (LIBOR)                  
Debt Instrument [Line Items]                  
Debt instrument, basis spread on variable rate       2.00%          
Minimum | Goldman Sachs Bank USA | Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Debt instrument, floor rate of basis spread on variable rate   0.50% 0.30%            
Maximum | Goldman Sachs Bank USA | Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Debt instrument, basis spread on variable rate     3.00%            
Senior Notes                  
Debt Instrument [Line Items]                  
Amortization of debt issuance costs       $ 789 186        
Interest expense, debt       $ 139 629        
Senior Notes | 1.75% Convertible Senior Notes due 2023                  
Debt Instrument [Line Items]                  
Stated Cash Interest Rate     1.75% 1.75%          
Amortization of debt issuance costs       $ 72 186        
Interest expense, debt       104 629        
Aggregated principal amount     $ 23,777 23,777   25,626     $ 143,750
Repurchased face amount     119,973 119,973          
Portion settled in cash       $ 1,886          
Issuance of common stock in connection with conversion of convertible senior notes (in shares) | shares       36,980          
Senior Notes | 0% Convertible Senior Notes due 2025                  
Debt Instrument [Line Items]                  
Amortization of debt issuance costs       $ 690 0        
Interest expense, debt       0 0        
Aggregated principal amount     $ 661,250 $ 661,250   $ 661,250 $ 661,250    
Senior Notes | 0.5% Convertible Senior Notes Due 2027                  
Debt Instrument [Line Items]                  
Stated Cash Interest Rate     0.50% 0.50%          
Amortization of debt issuance costs       $ 27 0        
Interest expense, debt       35 $ 0        
Aggregated principal amount     $ 500,000 $ 500,000          
Proceeds from issuance of convertible senior notes, net of issuance costs $ 488,234                
Common stock covered under capped calls (in shares) | shares 5,346,000                
Senior Notes | Convertible Senior Notes | Debt Instrument, Redemption, Period One                  
Debt Instrument [Line Items]                  
Threshold trading days | tradingDay       20          
Threshold consecutive trading days | tradingDay       30          
Threshold percentage of stock price trigger       130.00%          
Senior Notes | Convertible Senior Notes | Debt Instrument, Redemption, Period Two                  
Debt Instrument [Line Items]                  
Threshold trading days | businessDay       5          
Threshold consecutive trading days | tradingDay       5          
Senior Notes | Minimum | 0.5% Convertible Senior Notes Due 2027 | Call Option | Capped Call Transaction                  
Debt Instrument [Line Items]                  
Capped call price (in dollars per share) | $ / shares $ 93.53                
Senior Notes | Maximum | 0.5% Convertible Senior Notes Due 2027 | Call Option | Capped Call Transaction                  
Debt Instrument [Line Items]                  
Capped call price (in dollars per share) | $ / shares $ 138.56