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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Deferred tax assets        
Deferred revenue $ 697 $ 694    
Accrued expenses 5,321 3,746    
Stock-based compensation 7,631 3,314    
Impairment on investment 1,445 1,445    
Net operating loss carryforwards 17,206 12,857    
Tax credit carryforwards 12,112 10,462    
Interest expense carryforward 10,851 7,679    
Capital loss carryforwards 452 0    
Derivatives and hedging 0 4,400    
Total deferred tax assets 55,715 44,597    
Valuation allowance (14,170) (12,950) $ (7,816) $ (7,707)
Net deferred tax assets 41,545 31,647    
Deferred tax liabilities        
Depreciation and amortization (10,865) (6,024)    
State taxes (3,026) (2,816)    
Net deferred tax liabilities (13,891) (8,840)    
Net deferred tax assets and liabilities $ 27,654 $ 22,807