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Income taxes - Significant components of deferred taxes (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets:        
Net operating loss carryforwards $ 84,633 $ 71,917    
Operating lease liabilities 10,612 9,300    
Intangible assets 3,826 2,039    
Accrued expenses and other current liabilities 1,862 1,312    
Property, plant and equipment 510 971    
Inventory   148    
Research and development tax credit carryforwards 144 105    
Interest carryforwards 3,697      
Total deferred tax assets 105,284 85,792    
Less valuation allowance (74,547) (60,289) $ (150,113) $ (109,856)
Deferred tax assets, net of valuation allowance 30,737 25,503    
Deferred tax liabilities:        
Acquired IPR&D Intangible Asset (see Note 3, "Corlieve transaction") (15,033) (15,189)    
Operating lease right-of-use assets (9,323) (7,493)    
Other current assets and receivables (110) (87)    
Deferred tax liability (24,466) (22,769)    
Net deferred tax asset $ 6,271 $ 2,734