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Stock-Based Compensation - Schedule of Stock Option Activity (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Share-based Payment Arrangement [Abstract] |  |
Number of stock options, Beginning Balance | 109,281,000 | 108,613,000
Number of stock options, Granted | 7,000,000 | 2,500,000
Number of stock options, Exercised | (5,000,000) |
Number of stock options, Expired/Forfeited | (6,195,000) | (1,832,000)
Number of stock options, Ending Balance | 105,086,000 | 109,281,000
Weighted avg exercise price per share, Beginning Balance | $ 5.84 | $ 5.96
Weighted avg exercise price per share, Granted | 7.91 | 6.84
Weighted avg exercise price per share, Exercised | 0.96 |
Weighted avg exercise price per share, Expired/Forfeited | 7.36 | 7.44
Weighted avg exercise price per share, Ending Balance | 6.25 | 5.84
Weighted avg grant date fair value per share, Beginning Balance | 6.12 | 5.88
Weighted avg grant date fair value per share, Granted | 6.89 | 6.12
Weighted avg grant date fair value per share, Exercised | 0.96 |
Weighted avg grant date fair value per share, Expired/Forfeited | 7.26 | 7.32
Weighted avg grant date fair value per share, Ending Balance | $ 6.06 | $ 6.12
Weighted avg remaining contractual life (in years), Beginning Balance | 5 years 11 months 19 days | 6 years 10 months 28 days
Weighted avg remaining contractual life (in years), Granted | 9 years 3 months 26 days | 9 years 9 months 18 days
Weighted avg remaining contractual life (in years), Exercised | 6 months | 0 years
Weighted avg remaining contractual life (in years), Expired/Forfeited | 6 years 11 months 23 days | 7 years 6 months 18 days
Weighted avg remaining contractual life (in years), Ending Balance | 5 years 4 months 17 days | 5 years 11 months 19 days
Aggregate intrinsic value, Beginning Balance | $ 601,668 | $ 920,156
Aggregate intrinsic value, Ending Balance | 814,090 | $ 601,668
Aggregate intrinsic value, Exercisable Ending | 82,972 |
Aggregate intrinsic value, Unvested Ending | $ 22,114 |

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- Definition The weighted average grant-date fair value of options exercised during the reporting period as calculated by applying the disclosed option pricing methodology. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award options expired in period weighted average grant date fair value + References No definition available. + Details
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- Definition The weighted average grant-date fair value of options outstanding as calculated by applying the disclosed option pricing methodology. + References No definition available. + Details
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- Definition Weighted average remaining contractual term for option awards exercised in the period, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award options canceled, weighted average remaining contractual term + References No definition available. + Details
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- Definition Weighted average remaining contractual term for option awards granted in the period, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References No definition available. + Details
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- Definition Refers to options nonvested for weighted average remaining contractual term. + References No definition available. + Details
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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=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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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance 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)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. + References No definition available. + Details
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- Definition Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired. + References No definition available. + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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