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Equity Instruments and Stock Based Compensation (Details Textual)
12 Months Ended
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
Mar. 31, 2018
USD ($)
Mar. 12, 2018
shares
Feb. 23, 2018
shares
Feb. 12, 2018
USD ($)
Jan. 01, 2018
shares
Mar. 31, 2017
USD ($)
Dec. 30, 2016
€ / shares
Mar. 12, 2012
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Ordinary shares, shares authorized (in shares) 500,000,000 500,000,000 500,000,000                  
Ordinary shares, nominal value (in usd or euro per share) | (per share) $ 0.01 $ 0.01 $ 0.01               € 0.122  
Ordinary shares, shares issued (in shares) 42,720,000 41,463,000                    
Ordinary shares, shares outstanding (in shares) 37,313,000 39,346,000                    
Preferred shares, shares authorized (in shares) 50,000,000 50,000,000 50,000,000                  
Preferred shares, nominal value (in usd per share) | $ / shares $ 0.01 $ 0.01 $ 0.01                  
Preferred shares, shares outstanding (in shares) 0 0                    
Authorized repurchase amount | $         $ 7,000,000     $ 18,000,000   $ 25,000,000    
Stock repurchase program, remaining authorized repurchase amount | $         $ 50,000,000              
Share repurchases (in shares) 5,407,000                      
Share repurchases | $ $ (49,998,000) $ (22,361,000)                    
Unrecognized compensation expense | $ $ 6,726,000                      
Weighted average period for unrecognized expense (in years) 2 years 4 months 6 days                      
Excess tax benefit related to stock-based compensation | $ $ 0                      
Aggregate intrinsic value of options exercised | $ $ 0 $ 1,161,000 $ 58,000                  
Grant date fair value of options granted (in usd per share) | $ / shares $ 3.60 $ 5.20 $ 6.14                  
Number of securities called by each warrant (in shares) 1                      
Grant date fair value of warrants granted (in usd per share) | $ / shares     $ 2.99                  
Additional warrants outstanding                 3,300,000      
Warrant                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Weighted average period for unrecognized expense (in years) 0 years 0 years 2 years 6 months                  
Vesting period (in years) 1 year                      
Expiration period (in years) 4 years                      
Aggregate intrinsic value of warrants exercised | $ $ 0 $ 0 $ 0                  
Granted (in shares) 0 0                    
Free Share Award                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Vesting period (in years) 2 years 3 years   4 years                
Granted (in shares) 279,000   12.11                  
Weighted average grant fair value of free share awards | $ / shares $ 5.87 $ 8.95                    
Free Share Award | Minimum                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Service period (in years)       2 years                
Free Share Award | Maximum                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Service period (in years)       4 years                
Stock Option                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Vesting period (in years) 4 years                      
Expiration period (in years) 10 years                      
Number of shares authorized (in shares) 1,873,147,000                      
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) | $ / shares $ 0.01                      
Shares available for issuance under ESPP 1,000,000                      
Purchase price of common stock, percentage 85.00%                      
Stock issued during period, employee share purchase plans (in shares) 25,000                      
Eclat Pharmaceuticals                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Number of securities called by each warrant (in shares)             2,200,000         1,100
Remaining warrants outstanding expired           1,100,000            
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]                        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, 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]                        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, 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]                        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, 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]                        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, 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]                        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 33.00%