XML 35 R23.htm IDEA: XBRL DOCUMENT
v3.23.2

Common Stock (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2023
Equity [Abstract] |
Shares Reserved for Future Issuance | Shares reserved for future issuance at June 30, 2023 are as follows:
| Number of Shares
Common stock reserved for issuance for: |
2021 Employee Stock Purchase Plan | 32,358 |
Outstanding stock options | 5,770,076 |
Common stock options available for future grant: |
2014 Equity Incentive Plan | 43,311 |
2017 Inducement Equity Incentive Plan | 46,250 |
2019 Omnibus Equity Incentive Plan | 4,579,753 |
Total common shares reserved for future issuance | 10,471,748 |

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

X
- Definition Schedule Of Common Stock Reserved For Future Issuance [Table Text Block] + References No definition available. + Details
Name: | vtl_ScheduleOfCommonStockReservedForFutureIssuanceTableTextBlock
Namespace Prefix: | vtl_
Data Type: | dtr-types1:textBlockItemType
Balance Type: | na
Period Type: | duration