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Commitments and contingencies (Details) | Mar. 31, 2018 USD ($) shares | Mar. 26, 2018 USD ($) | Feb. 27, 2018 USD ($) ft² | Dec. 21, 2017 USD ($) | Dec. 19, 2017 USD ($) $ / shares shares
--- | --- | --- | --- | --- | ---
Operating Leased Assets [Line Items] |  |  |  |  |
Warrants to purchase common stock | shares | 13,009 |  |  |  |
Accrued expenses | $ 333,000 |  |  |  |
Amount paid to consultant | $ 4,000,000 |  |  |  |
Kairos Global Technology, Inc [Member] |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Area of lease | ft² |  |  | 107,600 |  |
Base rent per month |  | $ 665,760 | $ 223,800 |  |
Registration Rights Agreement [Member] |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Subscriptions amount |  |  |  | $ 37,037,528 | $ 37,000,000
Subscriptions amount additional unit |  |  |  |  | $ 37,528
Per unit price | $ / shares |  |  |  |  | $ 22.50
Warrants to purchase common stock | shares |  |  |  |  | 1,646,113

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