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v3.19.2

Stockholders' equity (Details) - USD ($) | 6 Months Ended
--- | ---
Jun. 30, 2019 | Jun. 30, 2018
Class of Stock [Line Items] |  |
Proceeds from the sale of stock | $ 19,671,712 |
Restricted Stock [Member] |  |
Class of Stock [Line Items] |  |
Issuance of common stock | 106,251 |
Restricted Stock [Member] | Director [Member] |  |
Class of Stock [Line Items] |  |
Issuance of common stock | 93,751 |
Restricted Stock [Member] | Consultant [Member] |  |
Class of Stock [Line Items] |  |
Issuance of common stock | 12,500 |
Series B Preferred Stock [Member] |  |
Class of Stock [Line Items] |  |
Preferred stock converted into common shares | 8,001 |
Series B Preferred Stock [Member] | H.C. Wainwright [Member] |  |
Class of Stock [Line Items] |  |
Maximum amount of sales shares | $ 100,000,000 |
Proceeds from the sale of stock | $ 18,900,000 |
Percentage of commission | 3.00% |
Weighted average price | $ 3.26 |

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