Pay vs Performance Disclosure - USD ($) | 12 Months Ended |
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 |
Pay vs Performance Disclosure [Table] | | | |
Pay vs Performance [Table Text Block] | Value of Initial Fixed $100 Investment Average SCT Average CAP NASDAQ Company- SCT CAP SCT CAP Compensation Compensation Company Biotech Index selected Compensation Compensation Compensation Compensation for Other for Other Total Share- Total Share- Net Loss Finacial Perf. Year for CEO 1 for CEO 1 for CEO 2 for CEO 2 NEOs NEOs holder Return holder Return ($M) Measure (a) (b) (c) (d) (e) (f) (g) (h) (i) (j) (k) 2022 $ 5,259,100 $ (173,208) $ N/A $ N/A $ 2,159,230 $ (50,500) $ 23.08 $ 113.65 (395.9) $ — 2021 $ 3,216,310 $ 3,169,786 $ 7,011,698 $ (2,484,140) $ 3,270,763 $ (324,022) $ 68.95 $ 126.45 (342.3) $ — 2020 $ N/A $ N/A $ 9,039,400 $ 22,045,076 $ 2,593,418 $ 5,003,997 $ 167.61 $ 126.42 (259.6) $ — Columns (b), (d) and (f) . Reflects compensation amounts reported in the “Summary Compensation Table” (“SCT”) for our CEOs and average amount reported for our non-CEO NEOs, for the respective years shown. Our CEOs and non-CEO NEOs for each of these fiscal years are shown below: Year CEO Non-CEO NEOs 2022 Frederick G. Vogt, Ph.D., J.D. Friedrich Graf Finckenstein, M.D., Jean-Marc Bellemin, Igor Bilinsky, Ph.D. 2021 Frederick G. Vogt, Ph.D., J.D. (effective June 18, 2021), Maria Fardis, Ph.D. (until June 18, 2021) Friedrich Graf Finckenstein, M.D., Jean-Marc Bellemin, Igor Bilinsky, Ph.D., Michael Swartzburg 2020 Maria Fardis, Ph.D. Frederick G. Vogt, Ph.D., J.D (as General Counsel), Friedrich Graf Finckenstein, M.D., Jean-Marc Bellemin, Michael Swartzburg Columns (c), (e) and (g) 2022 2021 2020 CAP Average CAP CAP Average CAP Average Compensation CAP Compensation Compensation CAP Compensation CAP for Compensation for for Compensation for Compensation Adjustments CEO 1 for other NEOs CEO 1 CEO 2 for other NEOs CEO 2 for other NEOs Reported Summary Compensation Table Total $ 5,259,100 $ 2,159,230 $ 3,216,310 $ 7,011,698 $ 3,270,763 $ 9,039,400 $ 2,593,418 Deduction for amounts reported under Stock Awards and Option Awards columns in Summary Compensation Table for applicable fiscal year. $ (3,872,500) $ (1,185,030) $ (2,463,502) $ (6,729,775) $ (2,880,217) $ (8,139,400) $ (2,197,299) Add back: The year-end fair value of any equity awards granted during the covered fiscal year that are outstanding and unvested as of the end of the fiscal year $ 1,597,498 $ 463,158 $ 2,416,978 $ — $ 1,548,311 $ 17,391,380 $ 3,771,653 The change in fair value of any awards granted in prior years that are outstanding and unvested as of the end of the fiscal year $ (1,408,496) $ (558,816) $ — $ — $ (1,234,414) $ 3,171,811 $ 728,968 For awards that are granted and vest in the same year, the fair value as of the vesting date $ — $ — $ — $ — $ — $ — $ — For awards granted in prior years that vest in the fiscal year, the change in the fair value from the end of the prior fiscal year to the vesting date $ (1,748,809) $ (929,042) $ — $ (2,766,063) $ (1,028,465) $ 581,885 $ 107,259 "Compensation Actually Paid" (173,208) (50,500) 3,169,786 (2,484,140) (324,022) 22,045,076 5,003,997 Column (h). Illustrates the value, as of the last day of the indicated fiscal year, of an investment of $100 in the Company’s common stock made on December 31, 2019. Column (i). Illustrates the value, as of the last day of the indicated fiscal year, of an investment of $100 in the NASDAQ Biotechnology Index made on December 31, 2019. Column (j) . Column (k) . At this time, given that we are a research and development company without revenue, we do not use any specific company-selected financial measures for purposes of determining “compensation actually paid.” As is the case with many companies in the biotechnology industry, our annual incentive objectives are generally tied to the Company’s strategic and operational goals rather than financial goals. However, our Compensation Committee has approved robust goals and objectives discussed annually in our Compensation Discussion and Analysis section in this proxy statement and the proxy statements reporting pay for the fiscal years covered in these tables. Accordingly, we do not have a financial metric in our executive compensation program that would constitute the Company Selected Measure, as contemplated under the SEC Pay Versus Performance disclosure rules. | | |
Named Executive Officers, Footnote [Text Block] | Columns (b), (d) and (f) . Reflects compensation amounts reported in the “Summary Compensation Table” (“SCT”) for our CEOs and average amount reported for our non-CEO NEOs, for the respective years shown. Our CEOs and non-CEO NEOs for each of these fiscal years are shown below: Year CEO Non-CEO NEOs 2022 Frederick G. Vogt, Ph.D., J.D. Friedrich Graf Finckenstein, M.D., Jean-Marc Bellemin, Igor Bilinsky, Ph.D. 2021 Frederick G. Vogt, Ph.D., J.D. (effective June 18, 2021), Maria Fardis, Ph.D. (until June 18, 2021) Friedrich Graf Finckenstein, M.D., Jean-Marc Bellemin, Igor Bilinsky, Ph.D., Michael Swartzburg 2020 Maria Fardis, Ph.D. Frederick G. Vogt, Ph.D., J.D (as General Counsel), Friedrich Graf Finckenstein, M.D., Jean-Marc Bellemin, Michael Swartzburg | | |
Adjustment To PEO Compensation, Footnote [Text Block] | Columns (c), (e) and (g) 2022 2021 2020 CAP Average CAP CAP Average CAP Average Compensation CAP Compensation Compensation CAP Compensation CAP for Compensation for for Compensation for Compensation Adjustments CEO 1 for other NEOs CEO 1 CEO 2 for other NEOs CEO 2 for other NEOs Reported Summary Compensation Table Total $ 5,259,100 $ 2,159,230 $ 3,216,310 $ 7,011,698 $ 3,270,763 $ 9,039,400 $ 2,593,418 Deduction for amounts reported under Stock Awards and Option Awards columns in Summary Compensation Table for applicable fiscal year. $ (3,872,500) $ (1,185,030) $ (2,463,502) $ (6,729,775) $ (2,880,217) $ (8,139,400) $ (2,197,299) Add back: The year-end fair value of any equity awards granted during the covered fiscal year that are outstanding and unvested as of the end of the fiscal year $ 1,597,498 $ 463,158 $ 2,416,978 $ — $ 1,548,311 $ 17,391,380 $ 3,771,653 The change in fair value of any awards granted in prior years that are outstanding and unvested as of the end of the fiscal year $ (1,408,496) $ (558,816) $ — $ — $ (1,234,414) $ 3,171,811 $ 728,968 For awards that are granted and vest in the same year, the fair value as of the vesting date $ — $ — $ — $ — $ — $ — $ — For awards granted in prior years that vest in the fiscal year, the change in the fair value from the end of the prior fiscal year to the vesting date $ (1,748,809) $ (929,042) $ — $ (2,766,063) $ (1,028,465) $ 581,885 $ 107,259 "Compensation Actually Paid" (173,208) (50,500) 3,169,786 (2,484,140) (324,022) 22,045,076 5,003,997 | | |
Non-PEO NEO Average Total Compensation Amount | $ 2,159,230 | $ 3,270,763 | $ 2,593,418 |
Non-PEO NEO Average Compensation Actually Paid Amount | $ (50,500) | (324,022) | 5,003,997 |
Adjustment to Non-PEO NEO Compensation Footnote [Text Block] | Columns (c), (e) and (g) 2022 2021 2020 CAP Average CAP CAP Average CAP Average Compensation CAP Compensation Compensation CAP Compensation CAP for Compensation for for Compensation for Compensation Adjustments CEO 1 for other NEOs CEO 1 CEO 2 for other NEOs CEO 2 for other NEOs Reported Summary Compensation Table Total $ 5,259,100 $ 2,159,230 $ 3,216,310 $ 7,011,698 $ 3,270,763 $ 9,039,400 $ 2,593,418 Deduction for amounts reported under Stock Awards and Option Awards columns in Summary Compensation Table for applicable fiscal year. $ (3,872,500) $ (1,185,030) $ (2,463,502) $ (6,729,775) $ (2,880,217) $ (8,139,400) $ (2,197,299) Add back: The year-end fair value of any equity awards granted during the covered fiscal year that are outstanding and unvested as of the end of the fiscal year $ 1,597,498 $ 463,158 $ 2,416,978 $ — $ 1,548,311 $ 17,391,380 $ 3,771,653 The change in fair value of any awards granted in prior years that are outstanding and unvested as of the end of the fiscal year $ (1,408,496) $ (558,816) $ — $ — $ (1,234,414) $ 3,171,811 $ 728,968 For awards that are granted and vest in the same year, the fair value as of the vesting date $ — $ — $ — $ — $ — $ — $ — For awards granted in prior years that vest in the fiscal year, the change in the fair value from the end of the prior fiscal year to the vesting date $ (1,748,809) $ (929,042) $ — $ (2,766,063) $ (1,028,465) $ 581,885 $ 107,259 "Compensation Actually Paid" (173,208) (50,500) 3,169,786 (2,484,140) (324,022) 22,045,076 5,003,997 | | |
Compensation Actually Paid vs. Total Shareholder Return [Text Block] | | | |
Compensation Actually Paid vs. Net Income [Text Block] | | | |
Total Shareholder Return Vs Peer Group [Text Block] | | | |
Tabular List [Table Text Block] | Performance Measure Manage overall spending to within 5% of budget Maintain sufficient cash balance at year-end to successfully finance future operating activities and clinical development programs Appropriately and opportunistically finance the Company through various means including the use of an at-the market equity financing facility | | |
Total Shareholder Return Amount | $ 23.08 | 68.95 | 167.61 |
Peer Group Total Shareholder Return Amount | 113.65 | 126.45 | 126.42 |
Net Income (Loss) | $ (395,900,000) | (342,300,000) | (259,600,000) |
PEO Name | Frederick G. Vogt, Ph.D., J.D. | | |
Measure [Axis]: 1 | | | |
Pay vs Performance Disclosure [Table] | | | |
Measure Name | Manage overall spending to within 5% of budget | | |
Measure [Axis]: 2 | | | |
Pay vs Performance Disclosure [Table] | | | |
Measure Name | Maintain sufficient cash balance at year-end to successfully finance future operating activities and clinical development programs | | |
Measure [Axis]: 3 | | | |
Pay vs Performance Disclosure [Table] | | | |
Measure Name | Appropriately and opportunistically finance the Company through various means including the use of an at-the market equity financing facility | | |
Frederick G. Vogt | | | |
Pay vs Performance Disclosure [Table] | | | |
PEO Total Compensation Amount | $ 5,259,100 | 3,216,310 | |
PEO Actually Paid Compensation Amount | (173,208) | 3,169,786 | |
Maria Fardis | | | |
Pay vs Performance Disclosure [Table] | | | |
PEO Total Compensation Amount | | 7,011,698 | 9,039,400 |
PEO Actually Paid Compensation Amount | | (2,484,140) | 22,045,076 |
PEO [Member] | Frederick G. Vogt | Deduction for amounts reported under Stock Awards and Option Awards columns in Summary Compensation Table for applicable fiscal year | | | |
Pay vs Performance Disclosure [Table] | | | |
Adjustment to Compensation Amount | (3,872,500) | (2,463,502) | |
PEO [Member] | Frederick G. Vogt | Add back: The year-end fair value of any equity awards granted during the covered fiscal year that are outstanding and unvested as of the end of the fiscal year | | | |
Pay vs Performance Disclosure [Table] | | | |
Adjustment to Compensation Amount | 1,597,498 | 2,416,978 | |
PEO [Member] | Frederick G. Vogt | The change in fair value of any awards granted in prior years that are outstanding and unvested as of the end of the fiscal year | | | |
Pay vs Performance Disclosure [Table] | | | |
Adjustment to Compensation Amount | (1,408,496) | | |
PEO [Member] | Frederick G. Vogt | For awards granted in prior years that vest in the fiscal year, the change in the fair value from the end of the prior fiscal year to the vesting date | | | |
Pay vs Performance Disclosure [Table] | | | |
Adjustment to Compensation Amount | (1,748,809) | | |
PEO [Member] | Maria Fardis | Deduction for amounts reported under Stock Awards and Option Awards columns in Summary Compensation Table for applicable fiscal year | | | |
Pay vs Performance Disclosure [Table] | | | |
Adjustment to Compensation Amount | | (6,729,775) | (8,139,400) |
PEO [Member] | Maria Fardis | Add back: The year-end fair value of any equity awards granted during the covered fiscal year that are outstanding and unvested as of the end of the fiscal year | | | |
Pay vs Performance Disclosure [Table] | | | |
Adjustment to Compensation Amount | | | 17,391,380 |
PEO [Member] | Maria Fardis | The change in fair value of any awards granted in prior years that are outstanding and unvested as of the end of the fiscal year | | | |
Pay vs Performance Disclosure [Table] | | | |
Adjustment to Compensation Amount | | | 3,171,811 |
PEO [Member] | Maria Fardis | For awards granted in prior years that vest in the fiscal year, the change in the fair value from the end of the prior fiscal year to the vesting date | | | |
Pay vs Performance Disclosure [Table] | | | |
Adjustment to Compensation Amount | | (2,766,063) | 581,885 |
Non-PEO NEO [Member] | Deduction for amounts reported under Stock Awards and Option Awards columns in Summary Compensation Table for applicable fiscal year | | | |
Pay vs Performance Disclosure [Table] | | | |
Adjustment to Compensation Amount | (1,185,030) | (2,880,217) | (2,197,299) |
Non-PEO NEO [Member] | Add back: The year-end fair value of any equity awards granted during the covered fiscal year that are outstanding and unvested as of the end of the fiscal year | | | |
Pay vs Performance Disclosure [Table] | | | |
Adjustment to Compensation Amount | 463,158 | 1,548,311 | 3,771,653 |
Non-PEO NEO [Member] | The change in fair value of any awards granted in prior years that are outstanding and unvested as of the end of the fiscal year | | | |
Pay vs Performance Disclosure [Table] | | | |
Adjustment to Compensation Amount | (558,816) | (1,234,414) | 728,968 |
Non-PEO NEO [Member] | For awards granted in prior years that vest in the fiscal year, the change in the fair value from the end of the prior fiscal year to the vesting date | | | |
Pay vs Performance Disclosure [Table] | | | |
Adjustment to Compensation Amount | $ (929,042) | $ (1,028,465) | $ 107,259 |