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Shareholders' equity and share-based payments - Expense (Details)
$ in Thousands
12 Months Ended
Jun. 06, 2019
€ / shares
shares
May 03, 2018
€ / shares
shares
Apr. 26, 2017
€ / shares
shares
Dec. 31, 2019
€ / shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Share-based payments              
Share-based expense         $ 233,000 $ 315,000 $ 182,000
TOTAL performance share plans              
Share-based payments              
Share-based expense         180,000 264,000 135,000
SunPower Plans              
Share-based payments              
Share-based expense         26,000 21,000 31,000
Capital increase reserved for employees              
Share-based payments              
Share-based expense         $ 27,000 $ 30,000 $ 16,000
Assumptions used for the valuation of the cost of the capital              
Subscription price | € / shares € 40.10 € 37.20 € 38.10        
Share price at the reference date | € / shares       € 49.91      
Number of shares | shares 9,845,111 9,174,817 9,350,220   10,050,000    
Risk-free interest rate (as a percent)         (0.419%)    
Employees loan financing rate (as a percent)         4.11%    
Non-transferability cost (as a percent)         19.21%    
Trading period to determine subscription price         20 days    
Subscription price discount (as a percent)         20.00%    
Euro swap rate term for risk-free interest rate         5 years    
Consumer's credit rate term for employees loan financing rate         5 years