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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2018
Class of Stock [Line Items] |
Summary of all warrant activity |
Outstanding and exercisable |  | Warrants |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Life |
January 1, 2017 |  |  | 791,368 |  |  | $ | 6.19 |  |  |  | 5.13 |
Issued |  |  | 325,000 |  |  |  | 20.00 |  |  |  | - |
December 31, 2017 |  |  | 1,116,368 |  |  | $ | 10.18 |  |  |  | 3.68 |
Issued |  |  | - |  |  |  | - |  |  |  | - |
Expired/forfeited |  |  | - |  |  |  | - |  |  |  | - |
Exercised |  |  | - |  |  |  | - |  |  |  | - |
Outstanding and exercisable, December 31, 2018 |  |  | 1,116,368 |  |  | $ | 10.18 |  |  |  | 2.68 |
Schedule of conversion of preferred stock issued to common stock |
|  | Shares of Preferred Stock Not Exchanged as of December 31, 2018 |  |  | Conversion Ratio |  |  | Shares of Common Stock after Conversion of all Outstanding Shares of Preferred Stock Not yet Exchanged at December 31, 2018 |
Series B Preferred Stock |  |  | 82 |  |  |  | 132.07 |  |  |  | 10,830 |
Warrant [Member] |
Class of Stock [Line Items] |
Summary of all stock option plans / warrant activity |
Outstanding Warrants to Purchase Common Stock as of December 31, 2018:
Description |  | Issue Date |  | Exercise Price |  |  | Shares |  |  | Expiration Date
August 2016 Prefunded Warrants (1) |  | 08/16/16 |  | $ | 10.00 |  |  |  | 360,000 |  |  | 02/16/22
August 2016 Purchase Warrants |  | 08/17/16 |  | $ | 11.20 |  |  |  | 431,368 |  |  | 02/17/22
August 2017 Purchase Warrants |  | 08/08/17 |  | $ | 20.00 |  |  |  | 325,000 |  |  | 08/08/20
Total Warrants Outstanding |  |  |  |  |  |  |  |  | 1,116,368 |  |  |
(1) | Under the terms of the prefunded warrants, the warrant holder prepaid $9.90 of the original $10.00 warrant per share exercise price at the time of issuance of the warrant. The remaining $0.10 exercise price is required to be paid in full prior to the issuance of any common stock under the terms of the prefunded warrant agreement.

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