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Note 13 - Stock-based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Sep. 01, 2021
Jul. 01, 2021
Dec. 26, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)       5,611,658 11,537,242 5,333,452  
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount       $ 42,700 $ 18,400    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)       30,480,317 34,857,068 24,926,640 23,326,692
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares)       15,375,845      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value       $ 92,600      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value       $ 66,100      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)       5,141,331 707,888 451,953  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value       $ 40,000      
Put Option, Redemption Share (in shares)     3,113,170        
Put Option, Underlying Option (in shares)     5,148,777        
Liability Balance Related to Common Stock   $ 49,700     $ 6,700    
Share-based Payment Arrangement, Option [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)       4 years      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)       10 years      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures, Total (in shares)   3,592,504          
Reclassifications of Temporary to Permanent Equity   $ 1,700          
Share-based Payment Arrangement, Expense   3,500          
PRC Options [Member]              
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total   $ 24,300          
Time and Performance Based Option [Member] | Share-based Payment Arrangement, Tranche One [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)         1 year    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage         25.00%    
Restricted Stock [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)       5,445,542      
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Exercised (in shares)         60,000    
Earn-Out RSUs [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)   4 years          
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)   10 years          
Share-based Payment Arrangement, Expense       $ 400      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Fair Value   $ 2,500          
Modified Common Stock [Member]              
Reclassifications of Temporary to Permanent Equity   39,300          
Share-based Payment Arrangement, Expense           $ 500  
Temporary Equity, Carrying Amount, Attributable to Parent       0 $ 25,100    
Modified Options [Member]              
Reclassifications of Temporary to Permanent Equity   $ 49,700          
Share-based Payment Arrangement, Expense       $ 11,800 $ 29,600    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)       1,365,503 19,443    
Liability Balance Related to Modified Options       $ 0 $ 36,800    
Liability Balance Related to Modified Options Reclassified to Liability-classified Outstanding Shares       15,400 5,800    
Liability Balance Related to Outstanding Shares Reclassified toTemporary Equity       $ 6,900 0    
Six Months Completion Option [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)       690,474      
Liability-classified Common Stock [Member]              
Share-based Payment Arrangement, Expense       $ 1,200 $ 900    
The 2021 Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)       43,238,067      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) 5,611,658            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)       $ 4.09 $ 1.63 $ 0.68  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value $ 23,000            
The 2021 Plan [Member] | Restricted Stock Units (RSUs) [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)       4 years      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)       10 years      
Share-based Payment Arrangement, Expense       $ 6,200      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)       $ 9.64      
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount       $ 45,200