Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets:
Accrued liability for vacation	$ 77	$ 81
Accrued commissions and bonuses / compensation	332	60
Accrued contingencies	121	68
Amortization	40
Bad debt reserve	552	580
Charitable contributions carryforward	7	8
Interest expense	2,173
Inventory reserve	3,200	2,075
Net operating loss carryovers	22,996	23,174
Stock option compensation	475	560
Other	24	42
Total deferred tax assets	29,997	26,648
Deferred tax liabilities:
Depreciation	(137)	(704)
Amortization		(3,355)
Total deferred tax liabilities	(137)	(4,059)
Valuation allowance	(29,860)	(22,589)
Net deferred tax assets