XML 35 R24.htm IDEA: XBRL DOCUMENT
v3.22.4

Supplementary Balance Sheet Information (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Components of Short-term investments | Short-term investments available-for-sale securities consist of the following:
| As of December 31, 2022
(in thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Market Value
Maturity less than 1 year: |  |  |  |  |  |  |
Certificate of deposit | $ | 16,101 |  |  | $ | 3 |  |  | $ | (81) |  |  | $ | 16,023 |
Corporate debt securities | 44,806 |  |  | 8 |  |  | (275) |  |  | 44,539 |
Commercial paper | 13,203 |  |  | 4 |  |  | (20) |  |  | 13,187 |
U.S. government agencies | 2,284 |  |  | 4 |  |  | — |  |  | 2,288 |
U.S. treasury securities | 7,905 |  |  | — |  |  | (18) |  |  | 7,887 |
Total maturity less than 1 year | 84,299 |  |  | 19 |  |  | (394) |  |  | 83,924 |
Maturity 1 to 2 years: |  |  |  |  |  |  |
Corporate debt securities | 5,016 |  |  | 1 |  |  | (21) |  |  | 4,996 |
Total maturity 1 to 2 years | 5,016 |  |  | 1 |  |  | (21) |  |  | 4,996 |
Total short-term investments | $ | 89,315 |  |  | $ | 20 |  |  | $ | (415) |  |  | $ | 88,920 |
| As of December 31, 2021
(in thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Market Value
Maturity less than 1 year: |  |  |  |  |  |  |
Certificate of deposit | $ | 1,260 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,260 |
Corporate debt securities | 58,822 |  |  | 2 |  |  | (38) |  |  | 58,786 |
Commercial paper | 14,453 |  |  | 4 |  |  | (3) |  |  | 14,454 |
Non U.S. government | 728 |  |  | — |  |  | — |  |  | 728 |
U.S. treasury securities | 20,380 |  |  | — |  |  | (24) |  |  | 20,356 |
Total maturity less than 1 year | 95,643 |  |  | 6 |  |  | (65) |  |  | 95,584 |
Maturity 1 to 2 years: |  |  |  |  |  |  |
Corporate debt securities | 29,676 |  |  | 1 |  |  | (73) |  |  | 29,604 |
U.S. treasury securities | 3,701 |  |  | — |  |  | (11) |  |  | 3,690 |
Total maturity 1 to 2 years | 33,377 |  |  | 1 |  |  | (84) |  |  | 33,294 |
Total short-term investments | $ | 129,020 |  |  | $ | 7 |  |  | $ | (149) |  |  | $ | 128,878 |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value | Investments available for sale that have been in a continuous unrealized loss position for greater than one-year consist of the following:
| As of December 31, 2022
(in thousands) | Fair Market Value |  | Gross Unrealized Loss
Corporate debt securities | $ | 17,084 |  |  | $ | (161) |
U.S. treasury securities | 3,666 |  |  | (14) |
Total short-term investments | $ | 20,750 |  |  | $ | (175) |
Components of Property and Equipment | The estimated useful lives of the major classes of property and equipment are as follows:
| Estimated Useful Lives
Furniture and office equipment | 3 to 5 years
Leasehold improvements | 4 to 6 years
Laboratory equipment | 5 years
Property and equipment consisted of the following:
| As of December 31,
(in thousands) | 2022 |  | 2021
Furniture and office equipment | $ | 1,066 |  |  | $ | 955 |
Leasehold improvements | 2,560 |  |  | 1,962 |
Laboratory equipment | 1,056 |  |  | 906 |
| 4,682 |  |  | 3,823 |
Less—accumulated depreciation | (3,413) |  |  | (3,441) |
Property and equipment, net | $ | 1,269 |  |  | $ | 382 |
Components of Accrued Liabilities | Accrued liabilities consisted of the following:
| As of December 31,
(in thousands) | 2022 |  | 2021
Accrued compensation | $ | 1,849 |  |  | $ | 1,435 |
Preferred stock dividend(1) | — |  |  | 414 |
Clinical trials | 2,333 |  |  | 1,639 |
Research agreements and services | 509 |  |  | 726 |
Director fees | 125 |  |  | 141 |
Patent, license and other fees | 24 |  |  | 43 |
Other accrued liabilities | 337 |  |  | 129 |
Total accrued liabilities | $ | 5,177 |  |  | $ | 4,527 |
(1)See Note 2 to the financial statements.

X
- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI https://asc.fasb.org/topic&trid=2196928 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27290-111563 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922888-210455 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionFairValueTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
Name: | us-gaap_PropertyPlantAndEquipmentTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the components of accrued liabilities. + References No definition available. + Details
Name: | us-gaap_ScheduleOfAccruedLiabilitiesTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration