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Stockholders' equity - Warrants (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jan. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Class of Warrant or Right [Line Items] |  |  |
New Common Shares Issued (number of shares) |  | 2,500,285 |
Warrant [Member] |  |  |
Class of Warrant or Right [Line Items] |  |  |
Class of Warrant or Right, Outstanding |  | 1,745,868 | 0.00
Class of Warrant or Right, Exercise Price of Warrants or Rights |  | $ 3.25 | $ 0.00
New Common Shares Issued (number of shares) |  | 4,246,153 |
Weighted Average Exercise Price Of Warrants Issued |  | $ 3.25 |
Exercise of Warrants for Common Stock, shares |  | (2,500,285) |
Investment Warrants, Exercise Price |  | $ 2.12 |
Class Of Warrant Of Right Exercisable |  | 1,745,868 |
Weighted Average Exercise Price of Warrants Exercisable |  | $ 3.25 |
January 2018 Public Offering [Member] | Warrant [Member] |  |  |
Class of Warrant or Right [Line Items] |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  | $ 3.25 |
New Common Shares Issued (number of shares) | 4,246,153 | 4,246,153 |
Exercise of Warrants for Common Stock, shares |  | (249,824) |
January 2018 Public Offering, Discounted Warrants [Member] | January 2018 Public Offering [Member] | Warrant [Member] |  |  |
Class of Warrant or Right [Line Items] |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  | $ 2.00 |
New Common Shares Issued (number of shares) |  | 2,250,461 |
Stock and Warrants Issued During Period, Value, Preferred Stock and Warrants |  | $ 1.8 |

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