Income Taxes (Details) - Summary of significant components of net deferred income taxes - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets:
Allowance for doubtful accounts	$ 1	$ 11
Inventory reserves	3,096	3,185
Consumables excess reserve	167	169
Accrued liabilities	81	52
Warrant interest expense	195	196
Stock compensation expense	789	789
State net operating loss	14,476	15,010
Net operating loss carryforward	41,105	40,437
Tax credits	710	740
Depreciation	1,000	1,329
Valuation allowance	(61,556)	(61,869)
Total deferred tax assets	64	49
Deferred tax liability:
Prepaid expenses	(64)	(49)
Net deferred tax liability