Quarterly report pursuant to Section 13 or 15(d)

Stock-based Compensation - 2015 Inducement Plan (Details)

v3.19.2
Stock-based Compensation - 2015 Inducement Plan (Details) - shares
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Jun. 09, 2019
Jun. 08, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Granted (shares) 1,614,500      
2015 Inducement Plan        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Shares authorized under the plan (in shares)     900,000 450,000
Granted (shares) 115,000 0    
Possible future issuance under equity compensation plan (in shares) 315,500 5,000