Quarterly report pursuant to Section 13 or 15(d)

Commitments and contingencies (Registration Rights Agreement) (Details)

v3.10.0.1
Commitments and contingencies (Registration Rights Agreement) (Details) - USD ($)
3 Months Ended 9 Months Ended
Apr. 09, 2018
Feb. 14, 2018
Dec. 21, 2017
Sep. 30, 2018
Sep. 30, 2018
Dec. 19, 2017
Class of Stock [Line Items]            
Accrual for loss contingency in accordance with ASC 450-20       $ 0 $ 1,357,000  
Lump sum payment made to consultant for services relating to the Company's business       $ 4,000,000 $ 4,000,000  
Monthly base rent $ 7,000          
Common Stock [Member]            
Class of Stock [Line Items]            
Shares issued   100,000     3,215  
Registration Rights Agreement [Member]            
Class of Stock [Line Items]            
Subscriptions amount     $ 37,037,528     $ 37,000,000
Subscriptions amount additional unit     $ 37,528      
Per unit price           $ 22.50
Warrants to purchase common stock     1,646,113      
Registration Rights Agreement [Member] | Common Stock [Member]            
Class of Stock [Line Items]            
Shares issued     1,646,113