Fair Value Measurements - Narrative (Details) $ in Thousands		12 Months Ended
	Nov. 07, 2022 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill impairment		$ 3,907	$ 0
Change in fair value of derivative liability		720	0
Derivative Financial Instruments, Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration		5,550	$ 4,830
AVTX-501 And AVTX-007 | Derivative Financial Instruments, Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, measurement with unobservable inputs reconciliation, recurring basis, liability, issuances	$ 4,800	5,600
AVTX-501
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Maximum aggregate milestone payment	20,000
AVTX-501 | Derivative Financial Instruments, Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, measurement with unobservable inputs reconciliation, recurring basis, liability, issuances	$ 3,500	3,800
AVTX-501 | Derivative Financial Instruments, Liabilities | Measurement Input, Probability Of Success
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability, measurement input	0.23
AVTX-501 | Derivative Financial Instruments, Liabilities | Measurement Input, Expected Term
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability, measurement input term	3 years 9 months 18 days
AVTX-007 | Derivative Financial Instruments, Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, measurement with unobservable inputs reconciliation, recurring basis, liability, issuances	$ 1,300	$ 1,700
AVTX-007 | Derivative Financial Instruments, Liabilities | Measurement Input, Probability Of Success
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability, measurement input	0.17
AVTX-007 | Derivative Financial Instruments, Liabilities | Measurement Input, Expected Term
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability, measurement input term	4 years 9 months 18 days
AVTX-007 | Derivative Financial Instruments, Liabilities | Measurement Input, Sales Forecast Peak
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability, measurement input	300,000
AVTX-611
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Maximum aggregate milestone payment	$ 20,000
ES | Derivative Financial Instruments, Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, measurement with unobservable inputs reconciliation, recurring basis, liability, issuances	5,000
Milestone One | AVTX-007
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Maximum aggregate milestone payment	6,250
Milestone Two | AVTX-007
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Maximum aggregate milestone payment	$ 67,500