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v3.21.2

Stockholders' Equity (Summary of Nonvested Options) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Options |  |  |  |
Nonvested at beginning of period |  |  | 2,825,652 |
Options granted |  |  | 1,436,929 |
Options vested |  |  | (1,223,108) |
Options forfeited |  |  | (155,784) |
Nonvested at end of period | 2,883,689 |  | 2,883,689 |
Weighted-Average Grant Date Fair Value |  |  |  |
Nonvested at beginning of period (in dollars per share) |  |  | $ 6.50 |
Options granted (in dollars per share) | $ 8.00 | $ 8.64 | 7.62 | $ 5.50
Options vested (in dollars per share) |  |  | 6.67 |
Options forfeited (in dollars per share) |  |  | 6.98 |
Nonvested at end of period (in dollars per share) | $ 6.96 |  | $ 6.96 |
Employee Consultant And Directors Stock Options |  |  |  |
Weighted-Average Grant Date Fair Value |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options | $ 14.1 |  | $ 14.1 |
Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition |  |  | 2 years 7 months 6 days |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount of cost to be recognized for option under share-based payment arrangement. + 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 (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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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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