Quarterly report pursuant to Section 13 or 15(d)

Basis of presentation, principles of consolidation and significant accounting policies - Narrative (Details)

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Basis of presentation, principles of consolidation and significant accounting policies - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Description Of Business And Summary Of Significant Accounting Policies [Line Items]          
Accumulated deficit $ 23,571   $ 23,571   $ 14,480
Warrant          
Description Of Business And Summary Of Significant Accounting Policies [Line Items]          
Anti-dilutive securities (in shares) 3,784,515 702,576 3,784,515 702,576  
Employee Stock Option          
Description Of Business And Summary Of Significant Accounting Policies [Line Items]          
Anti-dilutive securities (in shares) 2,769,000 670,000 2,769,000 670,000