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Stockholders' equity - Warrants (Details) - Warrant
 6 Months Ended
Jun. 30, 2018
$ / shares
shares
Number of options  
Outstanding, beginning balance (in shares) 0.00
Issued (in shares) 4,246,153
Exercised (in shares) (249,824)
Outstanding, ending balance (in shares) 3,996,329
Exercisable (in shares) 3,996,329
Weighted average exercise price  
Issues (in dollars per share) | $ / shares $ 3.25
Exercised (in dollars per share) | $ / shares 3.25
Outstanding, ending balance (in dollars per share) | $ / shares 3.25
Exercisable (in dollars per share) | $ / shares $ 3.25