Income Taxes (Tables)

12 Months Ended

Dec. 31, 2021

Income Tax Disclosure [Abstract]

Schedule of components of provision for income taxes

Components of provision for income taxes are as follows:

	Years Ended December 31,
(in thousands)	2021		2020		2019
Current:
Federal	$	(4,937)	$	(16,986)	$	5,461
State	483		192		719
Total current	(4,454)		(16,794)		6,180
Deferred:
Federal	4,065		15,169		1,803
State	1,547		2,263		(5,029)
Total deferred	5,612		17,432		(3,226)
Total provision for income taxes	$	1,158	$	638	$	2,954

Schedule of reconciliation of the federal statutory tax rate to our effective tax rate applicable to continuing operations

A reconciliation of the federal statutory tax rate to our effective tax rate applicable to continuing operations is as follows:

	Years Ended December 31,
	2021		2020		2019
Federal statutory tax rate	21.0	%	21.0	%	21.0	%
State and local income taxes	5.3	%	4.5	%	6.0	%
Research and development credits	(17.2)	%	(28.0)	%	—	%
Change in uncertain tax positions	(6.3)	%	6.9	%	0.2	%
Tax benefit from net operating loss carryback	—	%	(10.2)	%	—	%
Permanent items	1.4	%	5.4	%	2.3	%
State tax rate change effect on deferred balance	(0.8)	%	1.7	%	—	%
Other tax credits	(0.2)	%	(0.1)	%	(0.1)	%
Tax audit adjustments	(0.1)	%	—	%	0.9	%
Change in valuation allowance	—	%	—	%	(22.5)	%
Other	(0.4)	%	0.4	%	1.9	%
Tax provision	2.7	%	1.6	%	9.7	%

Schedule of significant components of the our deferred income tax assets and liabilities

The significant components of our deferred tax assets and liabilities are presented in the following table:

	As of December 31,
(in thousands)	2021		2020
Deferred tax assets:
Lease liabilities	$	40,389	$	35,801
Research and development credits	13,332		9,637
Accrued expenses	13,260		15,611
Provision for doubtful accounts and implicit price concessions	12,154		13,291
Deferred benefit plan compensation	8,316		11,199
Net operating loss carryforwards	7,714		8,907
Inventory reserves	3,425		2,945
Share-based compensation	2,998		3,437
Refund liabilities	2,169		2,518
Other	2,857		3,378
Deferred tax assets	106,614		106,724
Less: Valuation allowance	(2,075)		(2,112)
Total deferred tax assets	104,539		104,612
Deferred tax liabilities:
Lease assets	37,095		32,069
Goodwill	12,116		9,368
Property, plant, and equipment	6,731		7,198
Prepaid expenses	3,103		1,100
Total deferred tax liabilities	59,045		49,735
Net deferred tax assets	$	45,494	$	54,877

Schedule of activity in the valuation allowance

The following schedule presents the activity in the valuation allowance:

(in thousands) Year	Balance at Beginning of Year		Acquisitions		Provision		Released		Balance at End of Year
2021	$	2,112	$	—	$	(37)	$	—	$	2,075
2020	$	2,065	$	—	$	47	$	—	$	2,112
2019	$	8,930	$	—	$	238	$	7,103	$	2,065

Summary of reconciliation of liability for unrecognized tax benefits

A reconciliation of our liability for unrecognized tax benefits is as follows:

(in thousands)	2021		2020		2019
Unrecognized tax benefits, at beginning of the year	$	6,896	$	4,331	$	4,765
Additions for tax positions related to the current year	1,489		1,026		247
Increase related to prior year positions	546		1,891		—
Decrease related to prior year positions	(400)		(352)		(337)
Decrease for lapse of applicable statute of limitations	(3,979)		—		(344)
Unrecognized tax benefits, at end of the year	$	4,552	$	6,896	$	4,331