Quarterly report pursuant to Section 13 or 15(d)

Stock Based Compensation (Details)

v3.19.3
Stock Based Compensation (Details) - $ / shares
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]      
Weighted average exercise price per option forfeited and expired, exercise price (in usd per option) $ 4.85    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Weighted average grant date fair value per option forfeited and expired, fair value (in usd per option) $ 1.97    
Share-based Payment Arrangement, Option | Directors, Officers, Consultants and Employees      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Available for Grant, Number of Shares [Roll Forward]      
Options available for grant, beginning balance (in options) 3,805,774 4,145,774  
Options available for grant, granted (in options) (2,400,000) (340,000)  
Options available for grant, exercised (in options) 0 0  
Options available for grant, expired (in options) 1,774,069 0  
Additional options available for grant under 2019 Plan (in options) 8,000,000    
Options available for grant, ending balance (in options) 11,179,843 3,805,774 4,145,774
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Number of options outstanding, beginning balance (in options) 3,867,621 3,851,371  
Number of options outstanding, granted (in options) 2,400,000 340,000  
Number of options outstanding, exercised (in options) (497,552) (52,500)  
Number of options outstanding, forfeited and expired (in options) (1,774,069) (271,250)  
Number of options outstanding, ending balance (in options) 3,996,000 3,867,621 3,851,371
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]      
Weighted average exercise price, beginning balance (in usd per option) $ 4.05 $ 3.11  
Weighted average exercise price per option granted, exercise price (in usd per option) 0.96 1.18  
Weighted average exercise price per option exercised, exercise price (in usd per option) 0.12 1.24  
Weighted average exercise price per option forfeited and expired, exercise price (in usd per option)   3.22  
Weighted average exercise price, ending balance (in usd per option) 2.33 4.05 $ 3.11
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Weighted average grant date fair value, beginning balance (in usd per option) 1.84 1.84  
Weighted average grant date fair value per option granted fair value (in usd per option) 0.53 0.54  
Weighted average grant date fair value per option exercised, fair value (in usd per option) 0.97 0.68  
Weighted average grant date fair value per option forfeited and expired, fair value (in usd per option)   1.58  
Weighted average grant date fair value, ending balance (in usd per option) $ 1.12 $ 1.84 $ 1.84
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]      
Weighted average remaining exercise term 66 months 64 months 43 months
Weighted average remaining exercise term, options granted 81 months 56 months