Quarterly report pursuant to Section 13 or 15(d)

Subsequent events (Details)

v3.5.0.2
Subsequent events (Details) - USD ($)
6 Months Ended
Aug. 11, 2016
Jun. 27, 2016
Jun. 30, 2016
Dec. 31, 2015
Up-front Payment Arrangement        
Subsequent Event [Line Items]        
Upfront license fee       $ 1,100,000
Up-front Payment Arrangement | Licensing Agreements        
Subsequent Event [Line Items]        
Amortization period     10 years  
Unsecured Debt | Promissory note, net        
Subsequent Event [Line Items]        
Face value of debt   $ 1,000,000    
Debt interest rate   10.00%    
Unsecured Debt | Promissory note, net | Subsequent Event        
Subsequent Event [Line Items]        
Face value of debt $ 3,000,000      
Exercised warrants limitation, percentage of ownership 4.99%      
Exercised warrants limitation, percentage of ownership with notice 9.99%      
Debt interest rate 10.00%      
Common stock | Unsecured Debt | Promissory note, net        
Subsequent Event [Line Items]        
Warrants to purchase common stock (in shares)   100,000    
Exercise price of warrants (in dollars per share)   $ 2.61    
Common stock | Unsecured Debt | Promissory note, net | Subsequent Event        
Subsequent Event [Line Items]        
Warrants to purchase common stock (in shares) 300,000      
Exercise price of warrants (in dollars per share) $ 2.61