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Income Taxes - Significant Components of Deferred Tax Assets and Tax Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets:    
Net operating loss carry-forwards $ 587,211 $ 268,173
Stock-based compensation 33,089 43,978
Capitalized licenses, research and development and start-up costs 13,985 19,891
Tax credit carry-forwards 99,024 77,222
Accrued expenses 26,962 7,377
Deferred revenue 29,785 53,475
Operating lease liabilities 22,313 26,571
Lease financing obligation 23,718 10,570
Capitalized inventory 38,058 0
Other 0 11
Total gross deferred tax assets 874,145 507,268
Less: valuation allowance (823,468) (470,753)
Total deferred tax assets, net of valuation allowance 50,677 36,515
Deferred tax liabilities:    
Financing right-of-use assets (11,539) (2,612)
Operating right-of-use assets (20,349) (24,944)
Fixed assets (18,276) (8,959)
Other (513) 0
Total deferred tax liabilities (50,677) (36,515)
Net deferred tax assets $ 0 $ 0