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Stockholders' Equity - Schedule of Nonvested Stock Option (Details) - Equity Incentive 2011 Plan [Member] - $ / shares | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |
Common shares, nonvested beginning of period | 600,779 | 300,510 | 300,510 |
Common shares, granted | 8,917 | 30,542 | 586,552 |
Common shares, vested | (56,128) |  | (197,202) |
Common shares, forfeited | (3,141) |  | (89,081) |
Common shares, nonvested end of period | 550,427 |  | 600,779 | 300,510
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward] |  |  |  |
Weighted average grant date fair value, nonvested beginning of period | $ 0.64 | $ 0.80 | $ 0.80 |
Weighted average grant date fair value, granted | 0.16 | $ 0.91 | 0.40 |
Weighted average grant date fair value, vested | 1.20 |  | 1.44 |
Weighted average grant date fair value, forfeited | 0.88 |  | 0.80 |
Weighted average grant date fair value, nonvested end of period | $ 0.56 |  | $ 0.64 | $ 0.80
Weighted average remaining years to vest (in years) | 2 years 9 months 15 days |  | 2 years 11 months 27 days | 2 years 5 months

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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward] [Roll Forward] + References No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Nonvested, Weighted Average Remaining Contractual Term + References No definition available. + 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=116856206&loc=d3e5070-113901 + Details
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- Definition Number of non-vested options forfeited. + References No definition available. + Details
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- Definition Weighted average grant-date fair value of non-vested options forfeited. + References No definition available. + Details
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