Income Taxes Income Taxes (Tables)

12 Months Ended

Dec. 31, 2023

Income Tax Disclosure [Abstract]

Schedule of Deferred Tax Assets and Liabilities

The following table represents the significant components of our deferred tax assets and liabilities for the periods presented:

	December 31,
	2023		2022
Deferred income tax assets
Net operating loss carryforwards	$	160,329	$	164,242
Business interest limitation carryforwards	35,402		34,445
Tax credit carryforwards	23,968		23,240
Lease liabilities	11,472		15,019
Capitalized research and development costs	50,780		32,216
Other	15,108		30,719
Gross deferred income tax assets	297,059		299,881
Valuation allowance	(257,563)		(245,212)
Total deferred income tax assets, net of valuation allowance	39,496		54,669
Deferred income tax liabilities
Intangible assets	(29,608)		(40,069)
Right-of-use assets	(8,155)		(11,225)
Other	(1,997)		(3,618)
Total deferred income tax liabilities	(39,760)		(54,912)
Net deferred income tax assets and liabilities	$	(264)	$	(243)

Summary of Operating Loss Carryforwards

The following table represents our net operating loss ("NOL") carryforwards as of December 31, 2023 and 2022:

	December 31,
	2023		2022
Federal	$	642,212	$	651,498
Various states	32,234		34,718
Foreign	5,363		5,255

Schedule of Effective Income Tax Rate Reconciliation

The following table is a reconciliation of the U.S. federal income tax at statutory rate to our effective income tax rate:

	December 31,
	2023		2022		2021
U.S. federal income tax at statutory rate	21.00	%	21.00	%	21.00	%
State taxes (net of federal benefit)	3.26		5.02		9.31
Stock-based compensation	(5.18)		(3.24)		17.70
Permanent differences	(0.36)		(0.18)		(0.14)
Federal research and development credit	0.58		1.77		6.43
Change in valuation allowance	(11.62)		(20.12)		(44.33)
Other	(0.82)		0.26		(1.99)
Acquisition costs	—		(0.02)		(1.71)
Expiration of tax attribute carryforwards	(7.63)		(4.54)		—
Effective income tax rate	(0.77)	%	(0.05)	%	6.27	%

Schedule of Components of Income Tax Benefit

The following table summarizes the components of our income tax expense (benefit) from continuing operations for the periods presented:

	December 31,
	2023		2022		2021
Current income tax expense:
U.S. - State	$	959	$	1,074	$	1,215
Total current income tax expense	959		1,074		1,215
Deferred income tax benefit:
U.S. - Federal	16		97		—
U.S. - State	4		(1,055)		(7,322)
Total deferred income tax benefit	20		(958)		(7,322)
Total income tax expense (benefit)	$	979	$	116	$	(6,107)

Schedule of Unrecognized Tax Benefits Roll Forward

The following table summarizes the activity related to unrecognized tax benefits:

	December 31,
	2023		2022		2021
Unrecognized benefit—beginning of year	$	5,809	$	4,692	$	3,105
Gross (decreases) increases—prior year tax positions	(527)		(210)		32
Gross increases—current year tax positions	709		1,327		1,555
Unrecognized benefit—end of year	$	5,991	$	5,809	$	4,692