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Equity, Non-vested Stock Option Activity (Details) - Stock Options - $ / shares | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Status of the Company's non-vested options and changes during the year |  |  |
Non-vested options at the beginning of the period (in shares) | 36,989,300 |  |
Non-vested options, options granted (in shares) | 7,543,589 | 12,220,400 | 12,363,400
Non-vested options, options vested (in shares) | (12,616,316) |  |
Non-vested options, options forfeited (in shares) | (536,290) |  |
Non-vested options at the end of the period (in shares) | 31,380,283 | 36,989,300 |
Weighted Average Fair Value at Grant Date |  |  |
Weighted average fair value at the grant date, options outstanding at the beginning of the period (in dollars per share) | $ 6.43 |  |
Weighted average fair value at grant date, options granted (in dollars per share) | 13.27 | $ 8.17 | $ 6.13
Weighted average fair value at grant date, options vested (in dollars per share) | 5.68 |  |
Weighted average fair value at grant date, options forfeited (in dollars per share) | 7.91 |  |
Weighted average fair value at the grant date, options outstanding at the end of the period (in dollars per share) | $ 8.34 | $ 6.43 |

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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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