Quarterly report pursuant to Section 13 or 15(d)

Stockholders' equity (Details)

v3.8.0.1
Stockholders' equity (Details) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended
Mar. 31, 2017
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Aug. 21, 2017
Aug. 20, 2017
Dec. 31, 2016
Class of Stock [Line Items]                
Proceeds from issuance of common stock       $ 1,913,509      
Discount on Convertible Debt arising from values of beneficial conversion feature       2,424,849        
Discount on Convertible Debt arising from values of warrants       $ 2,325,151        
Common stock, shares authorized   170,000,000   170,000,000   170,000,000 60,000,000 60,000,000
Preferred stock, shares authorized   15,000,000   15,000,000       0
Conversion of notes payable and accrued interest to preferred stock       $ 4,798,671      
Interest rate percentage   4.50%   4.50%        
Interest expense   $ 4,773,397 $ 2,384 $ 4,802,296 $ 28,130      
Rights forfeited       532,911        
Total consideration under the agreements forfeited during period       $ 299,500        
Total consideration under the agreements forfeited during period charged to equity       291,995        
Total consideration under the agreements forfeited during period recorded as compensation       $ 7,505        
Dividend yield       0.00% 0.00%      
Expected term       5 years 5 years      
Expected price volatility       101.00%        
Risk free interest rate       1.92% 1.20%      
Expected price volatility, minimum       49.00%        
Expected price volatility, maximum       99.00%        
Risk free interest rates, minimum       0.80%        
Risk free interest rates, maximum       2.30%        
2002 Stock Incentive Plan [Member]                
Class of Stock [Line Items]                
Rights forfeited       494,578        
BDI [Member]                
Class of Stock [Line Items]                
Number of common shares previously held in escrow, cancelled during period       32,801        
Estimated value of common shares recoded resulting in a reduction in impairment loss       $ 134,812        
Share price   $ 4.11   $ 4.11        
Restricted Stock [Member]                
Class of Stock [Line Items]                
Common shares vested       42,622        
Rights forfeited       833        
Restricted Stock [Member] | Directors and Officers [Member]                
Class of Stock [Line Items]                
Award of restricted shares       422,000        
Shares terminated       40,000        
Common shares vested       42,622        
Non-qualified stock option awards [Member]                
Class of Stock [Line Items]                
Rights forfeited       37,500        
Common Stock [Member]                
Class of Stock [Line Items]                
Discount on Convertible Debt arising from values of beneficial conversion feature       $ 2,424,849        
Discount on Convertible Debt arising from values of warrants       $ 2,325,151        
Preferred Stock issued upon Notes payable conversion, shares              
Private Placement [Member]                
Class of Stock [Line Items]                
Total amount of financing from common stock units   $ 2,250,000   $ 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       $ 336,491        
Common stock shares held in escrow   500,000   500,000        
Proceeds from common stock and warrants released       $ 1,250,000        
Purchase price   $ 2.50   $ 2.50        
Private Placement [Member] | Convertible Note [Member]                
Class of Stock [Line Items]                
Debt instrument face amount   $ 4,750,000   $ 4,750,000        
Conversion price   $ 2.50   $ 2.50        
Conversion of note principal balance       $ 4,750,000        
Conversion of accrued interest on note       48,671        
Conversion of notes payable and accrued interest to preferred stock       $ 4,798,671        
Interest rate percentage   2.00%   2.00%        
Interest expense       $ 48,671        
Interest expense recognized on conversion of convertible notes       $ 4,750,000        
Maturity date       Sep. 16, 2018        
Private Placement [Member] | Warrant [Member]                
Class of Stock [Line Items]                
Number of warrants issued       900,000        
Exercise price   $ 3.56   $ 3.56        
Warrants to purchase common stock   1,900,000   1,900,000        
Warrant to purchase term       3 years        
Fair value of warrants $ 2,114,000              
Dividend yield 0.00%     0.00%        
Expected term 3 years     3 years        
Expected price volatility 114.00%     108.00%        
Risk free interest rate 1.66%     1.47%        
Maturity date       Mar. 15, 2020        
Private Placement [Member] | Common Stock [Member]                
Class of Stock [Line Items]                
Issuance of common stock       900,000        
Purchase price   $ 3.50   $ 3.50        
Designated as 2% Series A Convertible Stock [Member]                
Class of Stock [Line Items]                
Preferred stock, shares authorized   2,000,000   2,000,000        
Series A Preferred Stock | Private Placement [Member]                
Class of Stock [Line Items]                
Preferred Stock issued upon Notes payable conversion, shares       19,195        
Preferred stock stated value per share   $ 250   $ 250        
Number of common share preferred holders have rights to   1,919,472   1,919,472