Annual report pursuant to Section 13 and 15(d)

Stock-based Compensation - 2015 Inducement Plan (Details)

v3.21.1
Stock-based Compensation - 2015 Inducement Plan (Details) - shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Jun. 09, 2019
Jun. 08, 2019
Mar. 26, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Granted (shares) 349,437        
2015 Inducement Plan          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Shares authorized under the plan (in shares)     90,000 45,000 45,000
Granted (shares) 17,500 11,500      
Possible future issuance under equity compensation plan (in shares) 14,050 31,550