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Income Taxes - Net Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Income Taxes
Deferred revenue	$ 21	$ 36
Basis difference in intangible assets	2,994	3,157
Inventory reserve	2,434	2,247
Net operating loss carryforwards	3,605	6,438
Research and development tax credits	1,272	1,042
Accrued expenses	61	163
Stock-based compensation	309	322
Allowance for sales returns and doubtful accounts	128	107
Difference in property and equipment basis	(145)	(134)
Other	479	382
Total net deferred income tax asset	11,158	13,760
Less: Valuation allowance	(11,158)	(13,760)
Net deferred income tax asset (liability)

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