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Debt - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Line Of Credit Facility [Line Items]        
Debt obligations   $ 0   $ 43,541,000
Debt   0   $ 13,800,000
Weighted average borrowing rates       1.80%
Interest expense, related party   100,000 $ 800,000  
Borrowings outstanding from related parties   $ 0    
Loss on extinguishment of debt     $ 1,369,000  
DNI        
Line Of Credit Facility [Line Items]        
Debt       $ 29,800,000
Letter of Credit | NongHyup Bank and Korea Development Bank        
Line Of Credit Facility [Line Items]        
Available to draw under credit facilities       $ 19,000,000.0
Revolving Credit Facility | P N C Credit Facilities        
Line Of Credit Facility [Line Items]        
Loss on extinguishment of debt $ 1,400,000