Income Taxes - Summary of Deferred Tax Liabilities (Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred tax liabilities:
Subordinated debt	$ (6,482)	$ (3,659)
Indefinite lived intangibles	(168)	(64)
Operating lease assets	(1,208)	(756)
Software development costs	(2,814)	(1,219)
Intangible assets	(281)	(446)
Depreciation on property, plant and equipment	(931)	(352)
Gross deferred tax liabilities	(11,884)	(6,496)
Components of Deferred Tax Liabilities [Abstract]
Allowances for bad debts and inventory	3,392	3,013
Capitalized inventory costs	185	141
Intangible asset	0	117
Employee benefit accruals	2,783	2,427
Interest expense limitation under section 163 (j)	2,798	1,248
Operating lease liabilities	1,208	772
Federal net operating loss carryforward	15,719	8,563
State net operating loss carryforward	3,569	2,317
Federal and state tax credit carryforwards	7,549	5,777
Other	944	912
Gross deferred tax assets	38,147	25,287
Less valuation allowance	(26,431)	(18,855)
Non-current net deferred tax liabilities	$ (168)	$ (64)