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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Deferred tax assets:    
Accrued expenses and reserves $ 7,990 $ 6,402
Share-based compensation 10,078 8,979
Net operating loss and credits carryforwards 147,465 188,329
Property and equipment, textbooks and intangibles assets 0 1,849
Convertible senior notes 16,648 32,254
Research and experimental expenditures capitalization 37,719 0
Other items 6,777 7,221
Gross deferred tax assets 226,677 245,034
Valuation allowance (36,122) (238,317)
Total deferred tax assets 190,555 6,717
Deferred tax liabilities:    
Property and equipment, textbooks and intangibles assets (14,766) 0
Other (10,070) (7,878)
Total deferred tax liabilities (24,836) (7,878)
Net deferred tax asset (liability) $ 165,719  
Net deferred tax asset (liability)   $ (1,161)