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DEBT (Details)
$ in Thousands, ¥ in Millions
3 Months Ended 12 Months Ended
Jan. 31, 2021
USD ($)
Tool
Oct. 31, 2020
USD ($)
Jan. 31, 2021
CNY (¥)
Tool
Dec. 31, 2020
USD ($)
Debt Instruments [Abstract]        
Short-term debt $ 0 $ 4,708    
Weighted-average interest rate of short -term debt   2.02%    
Long Term Debt Maturing In Year One [Abstract]        
Next 12 months 21,641 $ 8,970    
Long-term Debt [Abstract]        
Months 13 - 24 21,131 15,142    
Months 25 - 36 20,730 13,406    
Months 37 - 48 28,842 9,789    
Months 49 - 60 9,281 9,432    
Thereafter 0 7,211    
Long-term debt $ 79,984 54,980    
Percent of repayment on approved loan principal in each first five semiannual loan repayments 7.50%   7.50%  
Percent of repayment on approved loan principal in each last five semiannual loan repayments 12.50%   12.50%  
Finance lease amount $ 35,560 0    
Xiamen Project Loans [Member]        
Long Term Debt Maturing In Year One [Abstract]        
Next 12 months 6,961 6,705    
Long-term Debt [Abstract]        
Months 13 - 24 10,055 7,334    
Months 25 - 36 10,055 9,592    
Months 37 - 48 10,055 9,789    
Months 49 - 60 9,281 9,432    
Thereafter 0 7,211    
Long-term debt $ 39,446 $ 43,358    
Interest rate at balance sheet date 4.90% 4.90%    
Basis spread on interest rates 0.25% 0.25%    
Maturity date Dec. 31, 2025      
Periodic payment amount Increases as loans mature      
Periodic payment frequency Semiannual, on individual loans      
Loan collateral (carrying amount) $ 95,703 $ 94,459    
Maximum borrowing capacity 53,400   ¥ 345.0  
Amount outstanding 46,400   300.0  
Xiamen Working Capital Loans [Member]        
Long Term Debt Maturing In Year One [Abstract]        
Next 12 months 8,861 2,265    
Long-term Debt [Abstract]        
Months 13 - 24 990 7,808    
Months 25 - 36 3,465 3,814    
Months 37 - 48 0 0    
Months 49 - 60 0 0    
Thereafter 0 0    
Long-term debt $ 4,455 $ 11,622    
Maturity date Jul. 31, 2023      
Periodic payment amount Increases as loans mature      
Periodic payment frequency Semiannual, on individual loans      
Maximum borrowing capacity $ 25,000      
Xiamen Working Capital Loans [Member] | Minimum [Member]        
Long-term Debt [Abstract]        
Interest rate at balance sheet date 4.53% 4.53%    
Basis spread on interest rates 0.6775% 0.40%    
Xiamen Working Capital Loans [Member] | Maximum [Member]        
Long-term Debt [Abstract]        
Interest rate at balance sheet date 4.61% 4.61%    
Basis spread on interest rates 0.76% 0.76%    
Xiamen Working Capital Loans (value added tax component) [Member]        
Long-term Debt [Abstract]        
Maximum borrowing capacity | ¥     140.0  
Amount outstanding under credit facility $ 13,300   86.1  
Xiamen Working Capital Loans, Fund Operations [Member]        
Long-term Debt [Abstract]        
Maximum borrowing capacity | ¥     60.0  
Amount outstanding | ¥     0.0  
Hefei Equipment Loan [Member]        
Long Term Debt Maturing In Year One [Abstract]        
Next 12 months 0      
Long-term Debt [Abstract]        
Months 13 - 24 4,641      
Months 25 - 36 1,701      
Months 37 - 48 0      
Months 49 - 60 0      
Thereafter 0      
Long-term debt $ 6,342      
Interest rate at balance sheet date 4.20%      
Basis spread on interest rates (0.45%)      
Maturity date Sep. 30, 2026      
Periodic payment amount [1] Varies      
Periodic payment frequency [2] Semiannual      
Loan collateral (carrying amount) $ 89,799      
Maximum borrowing capacity $ 30,900   200.0  
Amount outstanding | ¥     ¥ 41.0  
Number of lithography tools to be purchased | Tool 2   2  
Finance Lease [Member]        
Long Term Debt Maturing In Year One [Abstract]        
Next 12 months $ 5,819      
Long-term Debt [Abstract]        
Months 13 - 24 5,445      
Months 25 - 36 5,509      
Months 37 - 48 18,787      
Months 49 - 60 0      
Thereafter 0      
Long-term debt $ 29,741      
Contractual interest rate 1.14%   1.14%  
Maturity date Dec. 31, 2024      
Periodic payment amount [3] Varies      
Periodic payment frequency Monthly      
Loan collateral (carrying amount) [4] $ 35,560      
Finance lease amount       $ 35,600
Short-term obligation       $ 3,500
Amended and Restated Credit Agreement [Member]        
Long-term Debt [Abstract]        
Maximum borrowing capacity 100,000      
Amount outstanding under credit facility $ 0      
Term of loan 5 years      
Current borrowing capacity $ 50,000      
Cash limit for dividends, distributions and redemption on equity 50,000      
Available borrowing capacity $ 50,000      
Effective interest rate 1.12%   1.12%  
[1] First five loan repayments will each be for 7.5 percent of the approved 200 million RMB loan principal; last five installments will each be for 12.5 percent of the approved loan principal.
[2] Semiannual repayments commence in March 2022.
[3] See Note 8 for periodic payment amounts.
[4] Amount represents the carrying amount of the related right-of-use asset, in which the lessor has a secured interest.