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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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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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