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Stockholders' Equity - Inducement Plan - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
OUTSTANDING OPTIONS      
Options forfeited (73,859)    
WEIGHTED-AVERAGE EXERCISE PRICE      
Options forfeited $ 1.98    
Inducement Plan      
OUTSTANDING OPTIONS      
Outstanding at beginning of period 1,813,600    
Options granted 335,000    
Options exercised 0 0  
Outstanding at end of period 2,148,600   1,813,600
WEIGHTED-AVERAGE EXERCISE PRICE      
Outstanding at beginning of period $ 2.08    
Options granted 1.13    
Outstanding at end of period $ 1.93   $ 2.08
VESTED AND EXPECTED TO VEST      
Outstanding options 1,564,400    
Weighted-Average Exercise Price $ 1.91    
Aggregate Intrinsic Value (in thousands) $ 14    
ADDITIONAL DISCLOSURES      
Outstanding options exercisable at end of period 27,004    
Weighted-average exercise price exercisable at end of period $ 3.59    
Weighted-average contractual term outstanding 9 years 4 months 24 days   9 years 7 months 6 days
Weighted-average contractual term (years) exercisable 8 years 3 months 18 days    
Aggregate intrinsic value (in thousands) outstanding at end of period $ 16