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Income Taxes - Significant Components of Deferred Tax Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets:    
Net operating loss carryforwards $ 149,993 $ 126,794
Research and development tax credits 56,103 40,654
Stock-based compensation 10,586 9,959
Lease liability 8,646 7,908
Disallowed interest expense 11,859 8,122
Other 7,411 6,433
Total deferred tax assets 244,598 199,870
Deferred tax liabilities:    
Property and equipment (113)  
Equity component of Convertible Notes (18,302) (11,082)
Right of use assets (6,197) (6,480)
Total deferred tax liabilities 24,612 17,562
Net deferred tax assets before valuation allowance 219,986 182,308
Less valuation allowance (219,986) (182,308)
Net deferred tax assets $ 0 $ 0