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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2022

Income Tax Disclosure [Abstract]

Schedule of Reconciliation of Federal Statutory Rate on Loss before Income Taxes and before Gain from Sale of Equity Method Investment Rate to Effective Income Tax Rate

The reconciliation of the federal statutory rate on the income before income taxes to the effective income tax rate for the years ended December 31 is as follows:

		2022				2021				2020
Statutory federal tax rate			21.0	%			21.0	%			21.0	%
State income taxes, net of federal income tax benefit			(2.4	)			(4.2	)			(0.5	)
Increase in valuation allowance			14.5				9.2				41.2
Permanent items			(13.8	)			(17.9	)			(48.7	)
Tax credits			(9.9	)			(5.7	)			(11.2	)
Provision vs. tax return differences			2.1				(2.0	)			0.7
Foreign rate differential and deferred items			(0.2	)			—				0.1
Other			0.1				(0.1	)			0.3
			11.4	%			0.3	%			2.9	%

Schedule of Domestic and Foreign Components of Income (Loss) Before Income Taxes and before the Gain from Sale of Equity Method Investment

For financial reporting purposes, income before income taxes for the years ended December 31 include the following components (in thousands):

		2022				2021				2020
Domestic		$	29,157			$	56,620			$	17,688
Foreign			(470	)			185				773
		$	28,687			$	56,805			$	18,461

Schedule of Components of Provision (Benefit) for Income Taxes

Significant components of the provision (benefit) for income taxes for the years ended December 31 are as follows (in thousands):

		2022				2021				2020
Current:
Federal		$	2,105			$	1			$	215
State			955				(14	)			93
Foreign			298				171				252
			3,358				158				560
Deferred:
Foreign			(97	)			18				(21	)
			(97	)			18				(21	)
		$	3,261			$	176			$	539

Schedule of Significant Components of Deferred Tax Assets and Liabilities

Significant components of the Company’s deferred tax assets and liabilities as of December 31 were as follows (in thousands):

		2022				2021
Deferred tax assets:
Research and development tax credit carryforwards		$	33,764			$	36,041
Net operating loss carryforwards			22				5,985
Stock-based compensation			3,940				2,341
Inventory reserves			2,303				2,268
Investment tax credit carryforwards			2,461				1,928
UNICAP			1,118				1,363
Vacation accrual			1,248				1,338
Lease liabilities			1,422				787
Accrued payroll tax deferral			—				384
Capitalized research and development			12,142				—
Other			2,871				1,568
Total deferred tax assets			61,291				54,003
Less: Valuation allowance for deferred tax assets			(47,413	)			(43,329	)
Net deferred tax assets			13,878				10,674
Deferred tax liabilities:
Depreciation			(11,396	)			(9,048	)
ROU assets			(1,362	)			(756	)
Prepaid expenses			(751	)			(662	)
Other			(89	)			—
Total deferred tax liabilities			(13,598	)			(10,466	)
Net deferred tax assets (liabilities)		$	280			$	208

Schedule of Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits

A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in thousands):

		2022				2021				2020
Balance on January 1		$	3,246			$	2,297			$	2,070
Additions based on tax positions related to the current year			319				625				244
Additions (reductions) for tax positions of prior years			(54	)			393				(13	)
Lapse of statute			(37	)			(69	)			(4	)
Balance on December 31		$	3,474			$	3,246			$	2,297

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Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years.

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Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets.

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Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations.

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Tabular disclosure of income before income tax between domestic and foreign jurisdictions.

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Tabular disclosure of the change in unrecognized tax benefits.

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