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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Millions
Total
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Income (Loss)
Retained Earnings (Accumulated Deficit)
Balance at beginning of period (in shares) at Dec. 31, 2019   337,000      
Balance at beginning of period at Dec. 31, 2019 $ 1,175 $ 0 $ 2,670 $ 2 $ (1,497)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Proceeds from public offering of common stock, net of issuance costs (in shares)   48,000      
Proceeds from public offering of common stock, net of issuance costs of $1 1,853   1,853    
Exercise of options to purchase common stock, net (in shares)   8,000      
Exercise of options to purchase common stock 106   106    
Purchase of common stock under employee stock purchase plan 3   3    
Stock-based compensation 45   45    
Other comprehensive income, net of tax 6     6  
Net income (loss) (241)       (241)
Balance at end of period (in shares) at Jun. 30, 2020   393,000      
Balance at end of period at Jun. 30, 2020 2,947 $ 0 4,677 8 (1,738)
Balance at beginning of period (in shares) at Mar. 31, 2020   370,000      
Balance at beginning of period at Mar. 31, 2020 1,641 $ 0 3,268 (6) (1,621)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Proceeds from public offering of common stock, net of issuance costs (in shares)   18,000      
Proceeds from public offering of common stock, net of issuance costs of $1 1,303   1,303    
Exercise of options to purchase common stock, net (in shares)   5,000      
Exercise of options to purchase common stock 78   78    
Purchase of common stock under employee stock purchase plan 3   3    
Stock-based compensation 25   25    
Other comprehensive income, net of tax 14     14  
Net income (loss) (117)       (117)
Balance at end of period (in shares) at Jun. 30, 2020   393,000      
Balance at end of period at Jun. 30, 2020 2,947 $ 0 4,677 8 (1,738)
Balance at beginning of period (in shares) at Dec. 31, 2020   399,000      
Balance at beginning of period at Dec. 31, 2020 2,561 $ 0 4,802 3 (2,244)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Other comprehensive income, net of tax (2)        
Balance at end of period (in shares) at Mar. 31, 2021   401,000      
Balance at end of period at Mar. 31, 2021 3,838 $ 0 4,860 1 (1,023)
Balance at beginning of period (in shares) at Dec. 31, 2020   399,000      
Balance at beginning of period at Dec. 31, 2020 $ 2,561 $ 0 4,802 3 (2,244)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Exercise of options to purchase common stock, net (in shares) 3,860 4,000      
Exercise of options to purchase common stock $ 59   59    
Purchase of common stock under employee stock purchase plan 5   5    
Stock-based compensation 65   65    
Other comprehensive income, net of tax 13     13  
Net income (loss) 4,001       4,001
Balance at end of period (in shares) at Jun. 30, 2021   403,000      
Balance at end of period at Jun. 30, 2021 6,704 $ 0 4,931 16 1,757
Balance at beginning of period (in shares) at Mar. 31, 2021   401,000      
Balance at beginning of period at Mar. 31, 2021 3,838 $ 0 4,860 1 (1,023)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Exercise of options to purchase common stock, net (in shares)   2,000      
Exercise of options to purchase common stock 31   31    
Purchase of common stock under employee stock purchase plan 5   5    
Stock-based compensation 35   35    
Other comprehensive income, net of tax 15     15  
Net income (loss) 2,780       2,780
Balance at end of period (in shares) at Jun. 30, 2021   403,000      
Balance at end of period at Jun. 30, 2021 $ 6,704 $ 0 $ 4,931 $ 16 $ 1,757