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Stock-Based Compensation (Details Narrative) - USD ($) |  |  | 12 Months Ended
--- | --- | --- | ---
Feb. 19, 2019 | Sep. 28, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Unrecognized compensation cost related to non-vested stock based compensation |  |  | $ 1,600,000 |
Stock based compensation cost expected to be recognized, weighted average period |  |  | 1 year 1 month 6 days |
Research and Development Expense [Member] |  |  |  |
Compensation cost |  |  | $ 900,000 | $ 1,500,000
General and Administrative Expense [Member] |  |  |  |
Compensation cost |  |  | 1,400,000 | 3,100,000
Restricted Stock Awards [Member] |  |  |  |
Compensation cost |  |  | $ 4,600,000 | $ 4,600,000
Equity Stock Awards [Member] |  |  |  |
Number of shares reserved for future issuance |  |  | 4,130,886 |
Inducement Awards [Member] |  |  |  |
Number of shares reserved for future issuance |  |  | 210,006 |
Stock Options [Member] |  |  |  |
Inducement option grant, exercise price per share |  |  | $ 2.00 | $ 2.26
Compensation cost |  |  | $ 2,300,000 | $ 2,300,000
2018 Stock Incentive Plan [Member] |  |  |  |
Equity awards, number of stock authorized |  |  | 2,700,000 |
Percentage of fair market value of shares |  |  | 100.00% |
Percentage of outstanding stock determining factor for incentive stock price |  |  | 10.00% |
Number of shares reserved for future issuance |  |  | 4,580,893 |
2018 Stock Incentive Plan [Member] | Minimum [Member] |  |  |  |
Number of equity awards available for future issuance |  |  | 1,200,000 |
Percentage of fair market value of shares |  |  | 110.00% |
2018 Stock Incentive Plan [Member] | Maximum [Member] |  |  |  |
Number of equity awards available for future issuance |  |  | 3,900,000 |
Inducement Option Grants [Member] | Five New Employees [Member] |  |  |  |
Inducement option grant, exercise price per share | $ 2.18 | $ 2.77 |  |
Option vested period | 3 years | 3 years |  |
Options expiration period | 10 years | 10 years |  |
Inducement Option Grants [Member] | Five New Employees [Member] | Restricted Stock Awards [Member] |  |  |  |
Number of shares issued | 13,000 | 19,000 |  |
Inducement Option Grants [Member] | Five New Employees [Member] | Common Stock [Member] |  |  |  |
Number of shares issued | 140,004 | 164,004 |  |
2007 Stock Incentive Plan [Member] |  |  |  |
Number of shares reserved for future issuance |  |  | 450,007 |

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