XML 43 R31.htm IDEA: XBRL DOCUMENT
v3.22.4

Income Taxes (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2022
Income Tax Disclosure [Abstract] |
United States and Foreign Components of Consolidated Loss Before Income Taxes | U.S and foreign components of consolidated loss before income taxes for the years ended December 31, 2022, 2021 and 2020, was as follows (in thousands):
|  | 2022 |  |  | 2021 |  |  | 2020 |
Loss before income taxes: |  |  |  |  |  |  |  |  |
U.S. |  | $ | (43,096 | ) |  | $ | (54,757 | ) |  | $ | (61,246 | )
Foreign |  |  | 759 |  |  |  | 700 |  |  |  | 1,673 |
Loss before income taxes |  | $ | (42,337 | ) |  | $ | (54,057 | ) |  | $ | (59,573 | )
Provision Benefit for Income Taxes | The provision for income taxes for the years ended December 31, 2022, 2021 and 2020, was as follows (in thousands):
|  | 2022 |  |  | 2021 |  |  | 2020 |
Provision for income taxes: |  |  |  |  |  |  |  |  |
Current: |  |  |  |  |  |  |  |  |
Foreign |  | $ | 520 |  |  | $ | 274 |  |  | $ | 274 |
Federal |  |  | — |  |  |  | — |  |  |  | — |
State |  |  | 5 |  |  |  | — |  |  |  | — |
Total current |  |  | 525 |  |  |  | 274 |  |  |  | 274 |
Deferred: |  |  |  |  |  |  |  |  |
Foreign |  |  |  |  |  | — |  |  |  | — |
Federal |  |  | (18 | ) |  |  | 23 |  |  |  | 6 |
State |  |  | (19 | ) |  |  | 22 |  |  |  | 4 |
Total deferred |  |  | (37 | ) |  |  | 45 |  |  |  | 10 |
Provision for income taxes |  | $ | 488 |  |  | $ | 319 |  |  | $ | 284 |
Difference Between Provision for Income Taxes and Amounts Computed by Applying Federal Statutory Income Tax Rate to Loss before Taxes | The difference between the provision for income taxes and the amount computed by applying the federal statutory income tax rate to loss before taxes for the years ended December 31, 2022, 2021 and 2020, was as follows (in thousands):
|  | 2022 |  |  | 2021 |  |  | 2020 |
Federal statutory tax |  | $ | (8,891 | ) |  | $ | (11,352 | ) |  | $ | (12,510 | )
Federal research credits |  |  | (1,874 | ) |  |  | (2,159 | ) |  |  | (1,630 | )
State research credits |  |  | (822 | ) |  |  | (767 | ) |  |  | (749 | )
Expiration of federal carryovers |  |  | 4,858 |  |  |  | 4,651 |  |  |  | 9,200 |
Change in valuation allowance |  |  | 6,379 |  |  |  | 10,482 |  |  |  | 6,738 |
Compensation related items |  |  | 1,794 |  |  |  | 460 |  |  |  | 978 |
State taxes |  |  | (1,127 | ) |  |  | (1,294 | ) |  |  | (1,921 | )
Other |  |  | 171 |  |  |  | 298 |  |  |  | 178 |
Provision for income taxes |  | $ | 488 |  |  | $ | 319 |  |  | $ | 284 |
Significant Components of Deferred Tax Assets and Liabilities | The significant components of the Company’s deferred tax assets and liabilities at December 31, 2022, 2021 and 2020, were as follows (in thousands):
|  | December 31, |
|  | 2022 |  |  | 2021 |
Deferred tax assets: |  |  |  |  |  |
Net operating loss carryforwards |  | $ | 136,632 |  |  | $ | 150,523 |
Research and development credit carryforwards |  |  | 29,242 |  |  |  | 29,411 |
Capitalized research and development |  |  | 27,916 |  |  |  | 8,406 |
Compensation related items |  |  | 12,014 |  |  |  | 11,951 |
Operating leases |  |  | 3,786 |  |  |  | 4,125 |
Other |  |  | 9,056 |  |  |  | 8,218 |
Total deferred tax assets |  |  | 218,646 |  |  |  | 212,634 |
Valuation allowance |  |  | (215,903 | ) |  |  | (209,524 | )
Net deferred tax assets |  | $ | 2,743 |  |  | $ | 3,110 |
Deferred tax liabilities: |  |  |  |  |  |
Right-of-use assets |  | $ | 2,610 |  |  | $ | 2,895 |
Other |  |  | 194 |  |  |  | 313 |
Total deferred tax liabilities |  | $ | 2,804 |  |  | $ | 3,208 |
Gross Amounts and Dates of Expiration of Tax Credits and Carryovers | The Company's tax losses and credits are subject to varying carryforward periods. The gross amounts and dates of expiration of the significant carryforwards are as follows:
|  |  |  |  | Expires |  |  | Expires |  |  | Expires |  |  | No |
|  | Total |  |  | 2023-2025 |  |  | 2026-2032 |  |  | 2033-2042 |  |  | Expiration |
Federal losses carryovers |  | $ | 616,922 |  |  | $ | 69,647 |  |  | $ | 186,833 |  |  | $ | 169,673 |  |  | $ | 190,769 |
California loss carryovers |  |  | 75,192 |  |  |  |  |  |  | 46,641 |  |  |  | 28,551 |  |  |  |
Other state loss carryovers |  |  | 37,687 |  |  |  | 601 |  |  |  | 364 |  |  |  | 36,722 |  |  |  |
Federal research credits |  |  | 18,036 |  |  |  | 3,758 |  |  |  | 1,483 |  |  |  | 12,795 |  |  |  |
California research credits |  |  | 14,186 |  |  |  |  |  |  |  |  |  |  |  |  | 14,186 |
Federal foreign tax credits |  |  | 610 |  |  |  |  |  |  | 610 |  |  |  |  |  |  |
Reconciliation of Unrecognized Tax Benefits | The following is a tabular reconciliation of the total amounts of unrecognized tax benefits (in thousands):
|  | December 31, |  |  | December 31, |
|  | 2022 |  |  | 2021 |
Unrecognized tax benefits at beginning of period |  | $ | 9,366 |  |  | $ | 10,110 |
Decreases related to expired carryforwards |  |  | (1,481 | ) |  |  | (1,296 | )
Increases related to prior year tax positions |  |  | 258 |  |  |  | 112 |
Increases related to current year tax positions |  |  | 509 |  |  |  | 440 |
Unrecognized tax benefits at end of period |  | $ | 8,652 |  |  | $ | 9,366 |

X
- References No definition available. + Details
Name: | us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32639-109319 + Details
Name: | us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319 + Details
Name: | us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
Name: | us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of income before income tax between domestic and foreign jurisdictions. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(1)(Note 1)) -URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
Name: | us-gaap_ScheduleOfIncomeBeforeIncomeTaxDomesticAndForeignTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the change in unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 55 -Paragraph 217 -URI https://asc.fasb.org/extlink&oid=126976462&loc=d3e36027-109320 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -URI https://asc.fasb.org/extlink&oid=121826272&loc=SL6600010-109319 + Details
Name: | us-gaap_ScheduleOfUnrecognizedTaxBenefitsRollForwardTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of tax credit carryforwards available to reduce future taxable income, including amounts, expiration dates, limitations on use and the related deferred tax assets and valuation allowances. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32559-109319 + Details
Name: | us-gaap_SummaryOfTaxCreditCarryforwardsTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration