Income Taxes - Summary of deferred tax liabilities (assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax (liabilities) assets:
Subordinated debt	$ (3,659)	$ 0
Indefinite lived intangibles	(64)	0
Right of use assets	(756)
Software development costs	(1,219)	(1,954)
Acquired intangible assets	(446)	(676)
Depreciation on property, plant and equipment	(352)	0
Gross deferred tax liabilities	(6,496)	(2,630)
Allowances for bad debts and inventory	3,013	2,785
Capitalized inventory costs	141	116
Intangible assets	117	420
Employee benefit accruals	2,427	1,742
Interest Limitation	1,248	0
Lease liabilities	772
Federal net operating loss carryforward	8,563	6,512
State net operating loss carryforward	2,317	2,112
Tax credit carryforwards	5,777	6,176
Depreciation on property, plant and equipment	0	373
Other	912	722
Gross deferred tax assets	25,287	20,958
Less valuation allowance	(18,855)	(18,328)
Net deferred tax liabilities	$ (64)	$ 0