Quarterly report pursuant to Section 13 or 15(d)

Stockholders' equity (Details)

v3.7.0.1
Stockholders' equity (Details) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Class of Stock [Line Items]      
Proceeds from issuance of common stock $ 705,974  
Interest expense 4,834 $ 25,598  
Accrued interest 3,904  
Private Placement [Member]      
Class of Stock [Line Items]      
Proceeds from private placement 7,000,000    
Total amount of financing from common stock units 2,250,000    
Proceeds from issuance of common stock $ 1,000,000    
Issuance of common stock 400,000    
Offering expenses incurred from private placement stock issuance $ 294,026    
Common stock shares held in escrow 500,000    
Proceeds from common stock and warrants held in escrow $ 1,250,000    
Purchase price $ 2.50    
Private Placement [Member] | Warrant [Member]      
Class of Stock [Line Items]      
Exercise price of warrants $ 3.56    
Warrants to purchase common stock 1,900,000    
Warrant to purchase term 3 years    
Private Placement [Member] | Convertible Note [Member]      
Class of Stock [Line Items]      
Debt instrument face amount $ 4,750,000    
Conversion price $ 2.50    
Interest rate percentage 2.00%    
Interest expense $ 3,900    
Restricted Stock [Member]      
Class of Stock [Line Items]      
Award of restricted shares 165,000    
Common shares vested 6,042    
Warrant to purchase term 24 months