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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

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