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Subsequent event (Detail Textuals) - Subsequent event - Private placement - One institutional investor - Securities purchase agreement
Nov. 01, 2018
USD ($)
$ / shares
shares
Subsequent Event [Line Items]  
Amount of aggregate principal securities sold under private placement | $ $ 7,500,000
Number of investor warrant issued to purchase | shares 800,000
Investor warrants exercise price | $ / shares $ 6.53
Term of note matures 17 months
Interest rate 10.00%
Net proceeds from the private placement | $ $ 6,800,000
Senior convertible note  
Subsequent Event [Line Items]  
Amount of aggregate principal securities sold under private placement | $ $ 7,500,000
Number of aggregate principal securities sold under private placement | shares 1,198,084
Sale of stock, price per share | $ / shares $ 6.26
Placement agent warrants  
Subsequent Event [Line Items]  
Number of investor warrant issued to purchase | shares 119,808
Investor warrants exercise price | $ / shares $ 7.183
Percentage of warrants issued to purchase note 10.00%
Term of placement agent warrants 4 years