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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Taxes [Line Items]        
Income (loss) before taxes from U.S. operations $ (315,700) $ (275,400) $ (28,900)  
Income before taxes from foreign operations $ 1,800 $ 800 $ 600  
Statutory tax rate 21.00% 21.00% 21.00%  
Valuation allowance $ 445,574 $ 366,940    
Net operating loss carryforwards 400,600      
Research and development credit carryforward 71,500      
Total unrecognized tax benefit $ 10,410 8,335 $ 5,954 $ 21,979
Probability of benefit Realized Upon Settlement Uncertain Tax Position 50.00%      
Accrued interest or penalties   $ 0 $ 0  
Probability of benefit Realized Upon Settlement Uncertain Tax Position 50.00%      
Federal [Member]        
Income Taxes [Line Items]        
Net operating loss carryforwards $ 1,573,800      
Research and development credit carryforward $ 47,200      
Research and development tax credit carryforward, expiration 2024      
Benefit of federal net operating loss deferred tax assets $ 1,573,800      
Federal [Member] | With Expiration [Member]        
Income Taxes [Line Items]        
Net operating loss carryforwards 774,900      
State [Member]        
Income Taxes [Line Items]        
Net operating loss carryforwards 1,071,800      
Benefit of state net operating loss deferred tax assets 1,071,800      
State [Member] | No Expiration [Member]        
Income Taxes [Line Items]        
Research and development credit carryforward $ 42,600      
Minimum [Member] | Federal [Member]        
Income Taxes [Line Items]        
Net operating loss carryforward, expiration 2024