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INCOME TAXES - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Deferred tax assets:    
Net operating loss carryforwards $ 33,897 $ 31,721
Tax credit carryforwards 9,066 6,903
Intangible assets with definite lives 2,247 3,992
Disallowed interest carryforwards 227 3,705
Stock-based compensation 5,467 3,013
Other 8,309 5,477
Total deferred tax assets 59,213 54,811
Less: valuation allowance (52,023) (51,689)
Net deferred tax assets 7,190 3,122
Deferred tax liabilities:    
Prepaid expenses (3,835) (2,345)
Leasehold improvements and equipment (299) (415)
Right-of-use assets (2,561) (343)
Withholding taxes (506) (270)
Total deferred tax liabilities (7,201) (3,373)
Net deferred tax liability $ (11) $ (251)