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Income Taxes
 12 Months Ended
Dec. 31, 2023
Income Tax Disclosure [Abstract]  
Income Taxes Income Taxes
In accordance with the guidance pursuant to accounting for income taxes, a deferred tax asset or liability is determined based on the difference between the financial statement and tax basis of assets and liabilities as measured by the enacted tax rates which will be in effect when these differences reverse. The Company provides a valuation allowance against net deferred tax assets unless, based upon the available evidence, it is more likely than not that the deferred tax asset will be realized.
The components of pretax loss from operations are as follows:
Year Ended December 31,
202320222021
     U.S. Domestic$(134,979,579)$(277,440,803)$(302,614,003)
     Foreign(137,772)(211,249)(610,320)
Pretax loss from operations$(135,117,351)$(277,652,052)$(303,224,323)

There was no provision for or benefit from income taxes for the years ended December 31, 2023, 2022 and 2021.
The reconciliation of income taxes attributable to continuing operations computed at the statutory tax rates to income tax benefit, using a 21% statutory tax rate for December 31, 2023, 2022 and 2021, is as follows: 
Year Ended December 31,
202320222021
Benefit from income taxes at statutory rates$(28,375,000)$(58,307,000)$(63,677,000)
State income tax, net of federal benefit(3,922,000)(3,601,000)(3,447,000)
Change in valuation allowance28,394,000 61,065,000 77,424,000 
Research and development tax credits(2,139,000)(7,534,000)(16,523,000)
Stock-based compensation2,099,000 2,913,000 483,000 
Uncertain tax positions861,000 2,291,000 6,509,000 
Goodwill Impairment1,962,000 — — 
Expired NOLs and credits1,352,000 1,459,000 616,000 
Limited NOLs and credits(997,000)(1,337,000)(542,000)
Change in tax rates365,000 (187,000)— 
Foreign tax rate differential(4,000)(8,000)(24,000)
Other404,000 3,246,000 (819,000)
$— $— $— 

Significant components of the Company’s deferred tax assets and liabilities as of December 31, 2023 and 2022 are shown below:
As of December 31,
20232022
Deferred tax assets:
Capitalized research expense$50,143,000 $41,252,000 
NOL carryforwards235,624,000 212,768,000 
Research and development and other tax credits27,734,000 26,442,000 
Deferred revenue22,000 538,000 
Stock-based compensation3,683,000 3,945,000 
Acquired intangibles907,000 559,000 
Investment in affiliated entity1,406,000 1,569,000 
Lease liability2,822,000 3,247,000 
Fixed assets337,000 57,000 
Other6,808,000 11,062,000 
329,486,000 301,439,000 
Valuation allowance(327,493,000)(299,124,000)
Total deferred tax assets1,993,000 2,315,000 
Deferred tax liabilities:
Acquired intangibles— (199,000)
Right of use asset(1,993,000)(2,148,000)
Total deferred tax liabilities(1,993,000)(2,347,000)
Net deferred tax liabilities$— $(32,000)

As of December 31, 2023, the Company had federal, California and other state tax net operating loss (NOL) carryforwards of $1,013.3 million, $251.4 million and $102.6 million, respectively, net of the net operating losses that will expire due to IRC Section 382 limitations. The aggregate federal net operating losses generated in 2018 and after for the amount of $719.3 million will carryforward indefinitely and be available to offset up to 80% of future taxable income each year. The federal NOL carryforward began to expire in 2023, and the California and other state NOL carryforwards will begin and have begun to expire in 2028 and 2023, respectively, unless previously utilized.
The Company also had Korean NOL carryforwards of $1.1 million as of December 31, 2023. The Korean NOLs are available to offset up to 60% of future taxable income and will begin to expire in 2035, unless previously utilized.
In addition, as of December 31, 2023, the Company had federal and state research and development (R&D) tax credit carryforwards of $41.6 million and $6.1 million, respectively. The federal tax credit carryforwards will begin to expire in 2029. The California research tax credits do not expire.
Based upon statute, federal and state losses and credits are expected to expire as follows (in millions):
Expiration Date:Federal NOLsState NOLsForeign NOLsFederal R&DState R&D
2024$18.9 $9.1 $— $— $— 
202513.7 5.2 — — — 
202612.2 7.1 — — — 
2027 and thereafter249.2 332.0 1.1 41.6 — 
Indefinite719.3 0.6 — — 6.1 
$1,013.3 $354.0 $1.1 $41.6 $6.1 

Pursuant to Internal Revenue Code (IRC) Sections 382 and 383, annual use of the Company’s NOL and R&D credit carryforwards may be limited in the event that a cumulative change in ownership of more than 50% occurs within a three-year period. The Company has completed an IRC Section 382/383 analysis regarding the limitation of NOL and R&D credit carryforwards as of December 31, 2023. As a result of the analysis, the Company estimates that approximately $7.3 million of tax benefits related to NOL and R&D carryforwards will expire unused. Accordingly, the related NOL and R&D credit carryforwards have been removed from deferred tax assets accompanied by a corresponding reduction of the valuation
allowance. Due to the existence of the valuation allowance, limitations created by current and future ownership changes, if any, related to the Company's operations in the United States will not impact its effective tax rate. Any additional ownership changes, may further limit the ability to use the NOL and R&D carryforwards.
The Tax Cuts and Jobs Act of 2017 subjects a U.S. stockholder to tax on Global Intangible Low-Taxed Income (GILTI) earned by certain foreign subsidiaries. The FASB Staff Q&A, Topic 740, No. 5, Accounting for Global Intangible Low-Taxed Income, states that an entity can make an accounting policy election to recognize deferred taxes for temporary basis differences expected to reverse as GILTI in future years or to provide for the tax expense related to GILTI in the year the tax is incurred as a period expense only. The Company has elected to provide for the tax expense related to GILTI in the year the tax is incurred as a period expense only. For 2023, 2022 and 2021, the Company did not generate any GILTI due to losses earned by its foreign subsidiary.
The following table summarizes the activity related to the Company's unrecognized tax benefits:
 Year ended December 31,
 202320222021
Balance at beginning of the year$21,139,000 $18,819,000 $12,210,000 
Increases related to current year tax positions1,816,000 2,902,000 6,602,000 
Increases (decreases) related to prior year tax positions(841,000)(582,000)7,000 
Balance at end of the year$22,114,000 $21,139,000 $18,819,000 

The amount of unrecognized tax benefits that, if recognized and realized, would affect the effective tax rate was $20.5 million, $19.7 million and $17.4 million as of December 31, 2023, 2022 and 2021, respectively, subject to valuation allowances. The Company has not recorded any interest and penalties on the unrecognized tax positions as the Company has continued to generate net operating losses after accounting for the unrecognized tax benefits. The Company does not anticipate that the total amount of unrecognized tax benefits will significantly increase or decrease within twelve months of the reporting date.
The Company and its subsidiaries are subject to U.S. federal income tax as well as income tax in multiple state and foreign jurisdictions. With few exceptions, the Company is no longer subject to United States federal income tax examinations for years before 2020 and state and local income tax examinations before 2019. However, to the extent allowed by law, the tax authorities may have the right to examine prior periods where net operating losses were generated and carried forward, and make adjustments up to the amount of the NOL carryforward amount. The Company is not to its knowledge currently under Internal Revenue Service (“IRS”), state, local or foreign tax examination.