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Stockholders' Equity (Stock Option Activities) (Details) - USD ($) $ / shares in Units, $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Weighted Average Exercise Price |  |
Unrecognized compensation recognition period | 1 year 10 months 24 days |
Stock Options [Member] |  |
Options rollforward |  |
Stock Options, Outstanding, Number, Beginning Balance | 1,141,675 |
Options, Outstanding, Number, Ending Balance | 1,141,675 | 1,141,675
Options vested and exercisable | 713,547 |
Weighted Average Exercise Price |  |
Weighted Average Exercise Price, Beginning | $ 5.73 |
Weighted Average Exercise Price, Ending | 5.73 | $ 5.73
Weighted Average Exercise Price, options vested and exercisable | $ 5.73 |
Weighted Average Remaining Contractual Life, Options outstanding (in years) | 5 years 6 months 21 days | 6 years 3 months 21 days
Weighted Average Remaining Contractual Life, Options vested and exercisable (in years) | 5 years 6 months 21 days |
Unrecognized share-based compensation | $ 12,000.0 |
Unrecognized compensation recognition period | 1 month 6 days |

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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