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Net Loss Per Common Share (Reconciliation of Net Loss Per Share) (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Numerator:      
Net loss attributable to Comstock Mining Inc. $ (3,805,102) $ (9,480,753) $ (10,576,178)
Denominator:      
Basic and diluted weighted average shares outstanding 19,455,505 11,925,961 8,225,449
Net loss per common share:      
Basic and diluted (in usd per share) $ (0.20) $ (0.79) $ (1.29)