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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Income Tax [Line Items]    
Cumulative change in ownership 50.00%  
Period of cumulative ownership change 3 years  
Derecognized deferred tax assets $ 270,000  
Deferred tax assets valuation allowance 261,444 $ 198,030
Deferred tax assets change in valuation allowance 63,400 18,800
Tax benefits credited to contributed capital $ 200  
Net operating loss carrybacks period 5 years  
Unrecognized tax benefits that would not impact effective tax rate $ 18,300  
Percentage of limitation on net operating losses and tax credits 80.00%  
Unrecognized Tax Benefits, Interest on Income Taxes Accrued $ 19,600 $ 10,700
Cumulative Earnings (Deficit) $ 0  
Tax Year 2020    
Income Tax [Line Items]    
Net operating loss carried forwards as percentage on taxable income 100.00%  
Tax Year 2021 and Thereafter    
Income Tax [Line Items]    
Net operating loss carried forwards as percentage on taxable income 80.00%  
Federal    
Income Tax [Line Items]    
Net operating loss carryforwards $ 979,100  
Net operating loss carryforwards will not expire $ 535,600  
Net operating loss carried forwards as percentage on taxable income 80.00%  
Net operating loss carryforwards expiration date 2021  
Federal | Minimum    
Income Tax [Line Items]    
Tax year open for examination 2017  
Federal | Maximum    
Income Tax [Line Items]    
Tax year open for examination 2019  
Federal | Research Tax Credits    
Income Tax [Line Items]    
Tax credit carryforwards $ 11,100  
Tax credit carryforward expiration period 2034  
State    
Income Tax [Line Items]    
Net operating loss carryforwards $ 841,700  
Net operating loss carryforwards will not expire $ 53,200  
Net operating loss carried forwards as percentage on taxable income 80.00%  
Net operating loss carryforwards expiration date 2021  
State | Minimum    
Income Tax [Line Items]    
Tax year open for examination 2016  
State | Maximum    
Income Tax [Line Items]    
Tax year open for examination 2019  
State | Research Tax Credits    
Income Tax [Line Items]    
Tax credit carryforwards $ 7,800  
Tax credit carryforward expiration period 2031  
Foreign    
Income Tax [Line Items]    
Net operating loss carryforwards $ 5,400  
Korea    
Income Tax [Line Items]    
Net operating loss carryforwards expiration date 2022  
Korea | Minimum    
Income Tax [Line Items]    
Tax year open for examination 2015  
Korea | Maximum    
Income Tax [Line Items]    
Tax year open for examination 2019  
Italian | Minimum    
Income Tax [Line Items]    
Tax year open for examination 2015  
Italian | Maximum    
Income Tax [Line Items]    
Tax year open for examination 2019