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9. Debt (Details)
$ in Thousands, ¥ in Billions
3 Months Ended
Mar. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Jul. 31, 2020
USD ($)
Jul. 31, 2020
JPY (¥)
Long-term Debt [Abstract]        
Long-term debt, gross $ 258,672 $ 246,737    
Less: unamortized discount and issuance costs (6,617) (6,836)    
Total long-term debt 252,055 239,901    
Less current portion (4,701) (3,896)    
Noncurrent portion 247,354 236,005    
Long-term Debt, Fiscal Year Maturity [Abstract]        
Long-term Debt, Maturity, Remainder of Fiscal Year 3,298      
Long-Term Debt, Maturity, Year One 6,085      
Long-term Debt, Maturity, Year Two 82,600      
Long-Term Debt, Maturity, Year Three 7,560      
Long-Term Debt, Maturity, Year Four 7,965      
Long-Term Debt, Maturity, Year Five 9,199      
Long-Term Debt, Maturity, after Year Five 141,965      
Total long-term debt future principal payments $ 258,672      
Luz del Norte Credit Facilities [Member]        
Long-term Debt [Abstract]        
Debt instrument, currency USD      
Long-term debt, gross $ 183,092 183,829    
Luz del Norte Credit Facilities [Member] | DFC [Member] | Parque Solar Fotovoltaico Luz del Norte SpA [Member]        
Long-term Debt [Abstract]        
Long-term debt, gross 137,100 137,700    
Luz del Norte Credit Facilities [Member] | IFC [Member] | Parque Solar Fotovoltaico Luz del Norte SpA [Member]        
Long-term Debt [Abstract]        
Long-term debt, gross $ 46,000 46,100    
Luz del Norte Credit Facilities [Member] | DFC and IFC [Member]        
Long-term Debt [Abstract]        
Debt Instrument, Description of Fixed Rate Basis Fixed rate loans at bank rate plus 3.50%      
Debt Instrument, Description of Variable Rate Basis Variable rate loans at 91-Day U.S. Treasury Bill Yield or LIBOR plus 3.50%      
Debt Instrument, Basis Spread on Fixed Rate 3.50%      
Debt Instrument, Basis Spread on Variable Rate 3.50%      
Luz del Norte Credit Facilities [Member] | Fixed Rate Term Loan Facility [Member] | DFC and IFC [Member] | Parque Solar Fotovoltaico Luz del Norte SpA [Member]        
Long-term Debt [Abstract]        
Long-term debt, gross $ 129,300      
Luz del Norte Credit Facilities [Member] | Variable Rate Term Loan Facility [Member] | DFC and IFC [Member] | Parque Solar Fotovoltaico Luz del Norte SpA [Member]        
Long-term Debt [Abstract]        
Long-term debt, gross $ 53,800      
Kyoto Credit Facility [Member]        
Long-term Debt [Abstract]        
Debt instrument, currency JPY      
Long-term debt, gross $ 75,580 $ 62,908    
Kyoto Credit Facility [Member] | Mizuho Bank [Member]        
Long-term Debt [Abstract]        
Debt Instrument, Description of Variable Rate Basis 1-month TIBOR plus 0.60%      
Debt Instrument, Basis Spread on Variable Rate 0.60%      
Kyoto Credit Facility [Member] | Mizuho Bank [Member] | First Solar Japan GK [Member]        
Long-term Debt [Abstract]        
Line of Credit Facility, Current Borrowing Capacity     $ 142,800 ¥ 15.0