Stockholders' equity (Details) - USD ($) |
9 Months Ended | |
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Sep. 30, 2019 |
Sep. 30, 2018 |
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Class of Stock [Line Items] | ||
Proceeds from the sale of stock | $ 23,610,642 | |
Restricted Stock [Member] | ||
Class of Stock [Line Items] | ||
Issuance of common stock | 106,251 | |
Restricted Stock [Member] | Consultant and Advisory Board Members [Member] | ||
Class of Stock [Line Items] | ||
Issuance of common stock | 48,500 | |
Series B Preferred Stock [Member] | ||
Class of Stock [Line Items] | ||
Preferred stock converted into common shares | 8,801 | 1,353,505 |
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 | $ 22,700,000 | |
Percentage of commission | 3.00% | |
Weighted average price | $ 3.10 | |
Issuance of common stock | 7,608,785 |
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- Definition Maximum amount of sales shares. No definition available.
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- Definition Percentage of commission. No definition available.
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition Number of shares issued for each share of convertible preferred stock that is converted. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The cash inflow from the additional capital contribution to the entity. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction. No definition available.
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- Definition Number of new stock issued during the period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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