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Income Tax - Major components of deferred tax assets and liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Deferred tax assets:    
Net operating loss carryforward $ 49,422 $ 29,831
Research and development credit carryforward 941 0
Stock based compensation 2,560 1,167
Other 1,477 491
Total deferred tax assets 54,400 31,489
Deferred tax liabilities:    
Intangible asset (2,600) (2,189)
Other (54) (71)
Total deferred tax liabilities (2,654) (2,260)
Net deferred tax assets before valuation allowance 51,746 29,229
Valuation allowance (51,746) (29,229)
Deferred tax, net $ 0 $ 0