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Income Taxes - Temporary Differences (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Accrued expenses and other reserves	$ 1,787	$ 1,505
Right-of-use-asset	(225)	(378)
Lease liabilities	271	461
Tax credits, deferred R&D, and other	20	44
Net operating loss	14,510	12,758
Valuation allowance	(16,363)	(14,390)
Net deferred tax assets	$ 0	$ 0

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Deferred Tax Assets, Leasing Arrangements

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from in-process research and development costs expensed in connection with a business combination.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
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Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting.

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

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