Quarterly report pursuant to Section 13 or 15(d)

Stock Options and Warrants (Details 2)

v3.7.0.1
Stock Options and Warrants (Details 2) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Stock based compensation expense $ 383,000 $ 351,000 $ 653,000 $ 727,000
Research and development [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Stock based compensation expense 134,000 149,000 303,000 310,000
General and administrative [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Stock based compensation expense $ 249,000 $ 202,000 $ 350,000 $ 417,000