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Basis of Accounting Presentation and Summary of Significant Accounting Policies, Restatement of Previously Reported Information (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2021 | Sep. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2020 | Jun. 30, 2020
Balance Sheet [Abstract] |  |  |  |  |  |  |  |  |
In-process research and development | $ 5,990,000 | $ 5,990,000 | $ 5,990,000 | $ 5,990,000 | $ 5,990,000 | $ 5,990,000 |  | $ 5,990,000 | $ 5,990,000
Security deposits and other assets |  |  |  |  | 488,000 | 453,000 |  |  |
Contingent consideration | 0 | 0 | 0 | 0 | 0 | 0 |  | 0 | 0
Other liabilities |  |  |  |  | 48,000 | 23,000 |  |  |
Accumulated deficit | (132,742,000) | (36,663,000) | (46,756,000) | (132,742,000) | (140,702,000) | (18,141,000) |  |  |
Income Statement [Abstract] |  |  |  |  |  |  |  |  |
Change in fair value of contingent consideration | 0 | 0 | 0 | 0 | 0 | 0 | $ 0 |  |
Provision for income taxes |  |  |  |  | (64,000) | 0 |  |  |
Net loss | (85,985,000) | (18,522,000) | (28,607,000) | (114,592,000) | (122,545,000) | (7,291,000) |  |  |
Net loss attributable to common stockholders | $ (85,985,000) | $ (18,522,000) |  |  | $ (122,561,000) | $ (7,291,000) |  |  |
Net loss per common share - basic (in dollars per share) | $ (1.70) | $ (0.67) |  |  | $ (2.83) | $ (0.41) |  |  |
Net loss per common share - diluted (in dollars per share) | $ (1.70) | $ (0.67) |  |  | $ (2.83) | $ (0.41) |  |  |
Statement of Cash Flows [Abstract] |  |  |  |  |  |  |  |  |
Net loss | $ (85,985,000) | $ (18,522,000) | (28,607,000) | (114,592,000) | $ (122,545,000) | $ (7,291,000) |  |  |
Change in fair value of contingent consideration | 0 | 0 | 0 | 0 | 0 | 0 | $ 0 |  |
Security deposits and other assets |  |  |  |  | 0 | 90,000 |  |  |
Other liabilities |  |  |  |  | 25,000 | 25,000 |  |  |
As Previously Reported [Member] |  |  |  |  |  |  |  |  |
Balance Sheet [Abstract] |  |  |  |  |  |  |  |  |
In-process research and development | 6,860,000 | 6,860,000 | 6,860,000 | 6,860,000 | 6,860,000 | 6,860,000 |  | 6,860,000 | 6,860,000
Security deposits and other assets |  |  |  |  | 522,000 |  |  |  |
Contingent consideration | 19,360,000 | 19,290,000 | 19,290,000 | 19,360,000 | 19,930,000 | 20,110,000 |  | 870,000 | 870,000
Other liabilities |  |  |  |  | 23,000 |  |  |  |
Accumulated deficit | (151,232,000) | (55,083,000) | (65,176,000) | (151,232,000) | (159,703,000) | (37,381,000) |  |  |
Income Statement [Abstract] |  |  |  |  |  |  |  |  |
Change in fair value of contingent consideration | 70,000 | (820,000) | (820,000) | (750,000) | (180,000) | 19,240,000 |  |  |
Provision for income taxes |  |  |  |  | (5,000) |  |  |  |
Net loss | (86,055,000) | (17,702,000) | (27,787,000) | (113,842,000) | (122,306,000) | $ (26,531,000) |  |  |
Net loss attributable to common stockholders | $ (86,055,000) | $ (17,702,000) |  |  | $ (122,322,000) |  |  |  |
Net loss per common share - basic (in dollars per share) | $ (1.70) | $ (0.64) |  |  | $ (2.82) | $ (1.51) |  |  |
Net loss per common share - diluted (in dollars per share) | $ (1.70) | $ (0.64) |  |  | $ (2.82) | $ (1.51) |  |  |
Statement of Cash Flows [Abstract] |  |  |  |  |  |  |  |  |
Net loss | $ (86,055,000) | $ (17,702,000) | (27,787,000) | (113,842,000) | $ (122,306,000) | $ (26,531,000) |  |  |
Change in fair value of contingent consideration | 70,000 | (820,000) | (820,000) | (750,000) | (180,000) | 19,240,000 |  |  |
Security deposits and other assets |  |  |  |  | (34,000) |  |  |  |
Other liabilities |  |  |  |  | 0 |  |  |  |
Adjustments [Member] |  |  |  |  |  |  |  |  |
Balance Sheet [Abstract] |  |  |  |  |  |  |  |  |
In-process research and development | (870,000) | (870,000) | (870,000) | (870,000) | (870,000) | (870,000) |  | (870,000) | (870,000)
Security deposits and other assets |  |  |  |  | (34,000) |  |  |  |
Contingent consideration | (19,360,000) | (19,290,000) | (19,290,000) | (19,360,000) | (19,930,000) | (20,110,000) |  | $ (870,000) | $ (870,000)
Other liabilities |  |  |  |  | 25,000 |  |  |  |
Accumulated deficit | 18,490,000 | 18,420,000 | 18,420,000 | 18,490,000 | 19,001,000 | 19,240,000 |  |  |
Income Statement [Abstract] |  |  |  |  |  |  |  |  |
Change in fair value of contingent consideration | (70,000) | 820,000 | 820,000 | 750,000 | 180,000 | (19,240,000) |  |  |
Provision for income taxes |  |  |  |  | (59,000) |  |  |  |
Net loss | 70,000 | (820,000) | (820,000) | (750,000) | (239,000) | $ 19,240,000 |  |  |
Net loss attributable to common stockholders | $ 70,000 | $ (820,000) |  |  | $ (239,000) |  |  |  |
Net loss per common share - basic (in dollars per share) | $ 0 | $ (0.03) |  |  | $ (0.01) | $ 1.10 |  |  |
Net loss per common share - diluted (in dollars per share) | $ 0 | $ (0.03) |  |  | $ (0.01) | $ 1.10 |  |  |
Statement of Cash Flows [Abstract] |  |  |  |  |  |  |  |  |
Net loss | $ 70,000 | $ (820,000) | (820,000) | (750,000) | $ (239,000) | $ 19,240,000 |  |  |
Change in fair value of contingent consideration | $ (70,000) | $ 820,000 | $ 820,000 | $ 750,000 | 180,000 | $ (19,240,000) |  |  |
Security deposits and other assets |  |  |  |  | 34,000 |  |  |  |
Other liabilities |  |  |  |  | $ 25,000 |  |  |  |

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