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Income Taxes - Deferred tax assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Deferred tax assets    
Net operating tax loss carryforwards $ 27,362 $ 30,751
Contingent payment obligations 461 407
Stock-based compensation 1,559 3,208
R&E expenses 11,137  
Intangible assets 8,577 16,970
Total deferred tax asset 49,096 51,336
Less valuation allowance $ (49,096) $ (51,336)