Income Taxes - Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Deferred income tax assets
Net operating loss carryforwards	$ 48,556	$ 50,446
Stock-based compensation	507	4,765
Intangible assets and other	4,235	9,034
Net deferred income tax assets	53,298	64,245
Less:
Valuation allowance	$ (53,298)	$ (64,245)	$ (51,788)

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

+ References

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from compensation and benefits costs.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from share-based compensation.

+ References

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- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

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This Amount Represents Deferred Tax Assets Tax Deferred Expense Compensation And Benefits intangible assets

+ References

No definition available.

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