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Share-Based Compensation - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Feb. 29, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Ordinary shares, nominal value (in usd or euro per share) $ 0.01 $ 0.01     $ 0.01
Unrecognized compensation expense $ 12,322,000        
Weighted average period for unrecognized expense (in years) 3 years 4 months 24 days        
Aggregate intrinsic value of options exercised $ 1,841,000 $ 572,000 $ 0    
Grant date fair value of options granted (in usd per share) $ 4.63 $ 1.24 $ 3.60    
Number of securities called by each warrant (in shares) 1        
Stock-based compensation expense $ 2,999,000 $ 519,000 $ 7,852,000    
Warrant          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Aggregate intrinsic value of warrants exercised $ 0 $ 0 $ 0    
Granted (in shares) 0 0 0    
Common Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Employee share purchase plan share issuance (in shares) 49,000 54,000 25,000    
Free Share Award          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period (in years)       3 years  
Granted (in shares) 186,000        
Weighted average grant fair value of free share awards $ 7.69 $ 2.47 $ 5.87    
Stock Option          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares authorized (in shares) 4,122,315,000        
Vesting period (in years) 4 years        
Expiration period (in years) 10 years        
Stock Option | Board of Directors          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period (in years) 3 years        
Expiration period (in years) 10 years        
Performance Shares          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted (in shares) 257,000        
Weighted average grant fair value of free share awards $ 7.09        
Vesting percentage 150.00%        
Stock-based compensation expense $ 2,734,000        
Performance Shares | Share-based Payment Arrangement, Employee          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted (in shares) 49,000 54,000      
2017 Avadel Employee Share Purchase Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Ordinary shares, nominal value (in usd or euro per share) $ 0.01        
Shares available for issuance under ESPP 1,000,000        
Purchase price of common stock, percentage 85.00%        
2/3 vesting at second anniversary of grant date | Free Share Award, Grants during 2017          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting percentage 67.00%        
1/3 vesting at third anniversary of grant date | Free Share Award, Grants during 2017          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting percentage 33.00%        
1/3 vesting at third anniversary of grant date | Free Share Award, Grants beginning 2018          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting percentage 33.00%        
1/3 vesting at first anniversary of grant date | Free Share Award, Grants beginning 2018          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting percentage 33.00%        
1/3 vesting at second anniversary of grant date | Free Share Award, Grants beginning 2018          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting percentage 33.00%        
Vest One Year Following Achievement Of Milestones | Performance Shares          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period (in years) 1 year        
Vesting percentage 50.00%        
Vest Upon The Achievement Of Certain Regulatory Milestones | Performance Shares          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting percentage 50.00%