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Stock-Based Compensation - Schedule of Option Activity (Detail) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Provided for Stock Options under Stock-Based Compensation Plans      
Cash received from the exercise of stock options $ 70,000 $ 14,696,000 $ 21,971,000
WRL Omnibus Plan      
Options      
Outstanding as of January 1, 2020 23,700    
Granted 0    
Exercised 0    
Forfeited or expired 0    
Outstanding as of December 31, 2020 23,700 23,700  
Fully vested and expected to vest as of December 31, 2020 23,700    
Exercisable as of December 31, 2020 23,700    
Weighted Average Exercise Price      
Outstanding as of January 1, 2020 $ 80.42    
Granted 0    
Exercised 0    
Forfeited or expired 0    
Outstanding as of December 31, 2020 80.42 $ 80.42  
Fully vested and expected to vest as of December 31, 2020 80.42    
Exercisable as of December 31, 2020 $ 80.42    
Weighted Average Remaining Contractual Term      
Outstanding as of December 31, 2020 5 years 1 month 28 days    
Fully vested and expected to vest as of December 31, 2020 5 years 1 month 28 days    
Exercisable as of December 31, 2020 5 years 1 month 28 days    
Aggregate Intrinsic Value      
Outstanding as of December 31, 2020 $ 768,046    
Fully vested and expected to vest as of December 31, 2020 768,046    
Exercisable as of December 31, 2020 768,046    
Provided for Stock Options under Stock-Based Compensation Plans      
Intrinsic value of stock options exercised 0 $ 24,731,000 22,387,000
Cash received from the exercise of stock options $ 0 $ 14,696,000 $ 20,148,000
WML Share Option Plan      
Options      
Outstanding as of January 1, 2020 11,013,400    
Granted 8,895,000    
Exercised (50,000)    
Forfeited or expired 0    
Outstanding as of December 31, 2020 19,858,400 11,013,400  
Fully vested and expected to vest as of December 31, 2020 19,858,400    
Exercisable as of December 31, 2020 7,033,400    
Weighted Average Exercise Price      
Outstanding as of January 1, 2020 $ 2.51    
Granted 2.16    
Exercised 1.41    
Forfeited or expired 0    
Outstanding as of December 31, 2020 2.36 $ 2.51  
Fully vested and expected to vest as of December 31, 2020 2.36    
Exercisable as of December 31, 2020 $ 2.53    
Weighted Average Remaining Contractual Term      
Outstanding as of December 31, 2020 7 years 6 months 7 days    
Fully vested and expected to vest as of December 31, 2020 7 years 6 months 7 days    
Exercisable as of December 31, 2020 5 years 10 days    
Aggregate Intrinsic Value      
Outstanding as of December 31, 2020 $ 305,363    
Fully vested and expected to vest as of December 31, 2020 305,363    
Exercisable as of December 31, 2020 $ 233,592    
Provided for Stock Options under Stock-Based Compensation Plans      
Weighted average grant date fair value $ 0.54 $ 0.55 $ 0.57
Intrinsic value of stock options exercised $ 57,000 $ 0 $ 1,715,000
Cash received from the exercise of stock options 70,000 $ 0 $ 1,823,000
Unrecognized compensation, stock options $ 6,200,000    
Unrecognized compensation cost, weighted average period 4 years 10 days    
WIL Omnibus Plan      
Options      
Outstanding as of January 1, 2020 0    
Granted 80,846    
Assumed in business combination 9,452    
Forfeited or expired 0    
Outstanding as of December 31, 2020 90,298 0  
Fully vested and expected to vest as of December 31, 2020 90,298    
Exercisable as of December 31, 2020 4,229    
Weighted Average Exercise Price      
Outstanding as of January 1, 2020 $ 0    
Granted 1,236.00    
Assumed in business combination 264.00    
Forfeited or expired 0    
Outstanding as of December 31, 2020 1,134.00 $ 0  
Fully vested and expected to vest as of December 31, 2020 1,134.00    
Exercisable as of December 31, 2020 $ 238.00    
Weighted Average Remaining Contractual Term      
Outstanding as of December 31, 2020 9 years 11 months 1 day    
Fully vested and expected to vest as of December 31, 2020 9 years 11 months 1 day    
Exercisable as of December 31, 2020 9 years 8 months 8 days    
Aggregate Intrinsic Value      
Outstanding as of December 31, 2020 $ (57,716)    
Fully vested and expected to vest as of December 31, 2020 (57,716)    
Exercisable as of December 31, 2020 $ 1,088    
Provided for Stock Options under Stock-Based Compensation Plans      
Weighted average grant date fair value $ 147 $ 0 $ 0
Unrecognized compensation, stock options $ 12,800,000    
Unrecognized compensation cost, weighted average period 3 years 9 months 10 days