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Stockholders' Equity - Inducement Plan - Stock Option Activity (Details) - Inducement Plan - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
OUTSTANDING OPTIONS      
Outstanding at beginning of period 100,600    
Options granted 1,647,600    
Options exercised (10,092) 0  
Options forfeited (24,508)    
Outstanding at end of period 1,713,600   100,600
WEIGHTED-AVERAGE EXERCISE PRICE      
Outstanding at beginning of period $ 3.09    
Options granted 2.03    
Options exercised 2.06    
Options forfeited 2.06    
Outstanding at end of period $ 2.09   $ 3.09
VESTED AND EXPECTED TO VEST      
Outstanding options 1,164,400    
Weighted-Average Exercise Price $ 2.12    
Aggregate Intrinsic Value (in thousands) $ 177    
ADDITIONAL DISCLOSURES      
Outstanding options exercisable at end of period 18,754    
Weighted-average exercise price exercisable at end of period $ 3.57    
Weighted-average contractual term outstanding 9 years 9 months 18 days   9 years 6 months
Weighted-average contractual term (years) exercisable 8 years 9 months 18 days    
Aggregate intrinsic value (in thousands) outstanding at end of period $ 264