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Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Deferred tax assets:    
Allowance for doubtful accounts $ 262 $ 134
Accrued liabilities 3,412 3,478
Operating lease liabilities 3,456 4,878
Deferred revenue 1,880 1,702
Stock-based compensation - deferred tax asset 2,278 1,968
OID 8,848 9,433
Tax credits 9,214 7,270
Net operating losses 50,285 47,385
Other deferred tax assets 4,166 2,207
Total deferred tax assets 83,801 78,455
Less: valuation allowance (32,224) (37,771)
Net deferred tax assets 51,577 40,684
Deferred tax liabilities:    
Property and equipment 7,813 8,038
Goodwill 1,130 989
Intangibles 49,470 60,667
Operating lease assets 2,860 4,092
Debt 38,411 27,766
Other liability 289 137
Total deferred tax liabilities 99,973 101,689
Net deferred tax liability $ (48,396) $ (61,005)