Income Taxes - Components of the Deferred Tax Asset (Liability) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Allowance for doubtful accounts	$ 226	$ 105
Inventory reserve	66	67
Property and equipment	1,465	1,078
Accrued expenses	858	1,276
Deferred revenue	847	643
State tax - deferred	1,914	1,724
Net operating loss carryforwards	13,732	14,114
Other	4,747	3,992
Deferred tax assets, gross	23,855	22,999
Less - Valuation allowance	22,657	22,143
Total deferred tax assets	1,198	856
Deferred tax liabilities:
Other	(1,952)	(1,434)
Total deferred tax liabilities	(1,952)	(1,434)
Deferred tax liabilities, net	$ (754)	$ (578)