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Stockholders' equity (Details) - USD ($) | 1 Months Ended | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Feb. 14, 2018 | Mar. 31, 2018 | Mar. 31, 2017 | Jan. 25, 2018 | Jan. 04, 2018 | Dec. 31, 2017
Class of Stock [Line Items] |  |  |  |  |  |
Common stock, shares authorized |  | 170,000,000 |  |  |  | 170,000,000
Preferred stock, shares authorized |  | 15,000,000 |  |  |  | 15,000,000
Warrants to purchase common stock |  | 13,009 |  |  |  |
Interest rate percentage |  | 4.50% |  |  |  |
Interest expense |  | $ 1,069 | $ 4,834 |  |  |
Prive Technologies, Inc. [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Shares issued |  | 1,000,000 |  |  |  |
Common stock shares held in escrow |  | 200,000 |  |  |  |
Series B Preferred Stock [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred stock converted to Common stock |  | 530,001 |  |  |  |
Preferred stock, shares outstanding |  | 928,000 |  |  |  |
Warrant [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Proceeds from common stock and warrants released | $ 350,000 |  |  |  |  |
Warrants to purchase common stock | 100,000 |  |  |  |  |
Restricted Stock [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Shares issued |  | 50,000 |  |  |  |
Common shares vested |  | 30,913 |  |  |  |
Common Stock [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Warrants to purchase common stock |  | 3,215 |  |  |  |
Common Stock [Member] | Employee Stock Option [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Shares issued |  |  |  |  | 19,533 |
Common Stock [Member] | Consulting Services [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Shares issued |  |  |  | 2,754 |  |

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