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Stockholders' Equity - Stock Awards (Details) - Restricted Stock - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Number of Other than Options        
Outstanding, beginning balance (in shares)     780,833  
Granted (in shares)     254,623  
Canceled (in shares)     0  
Vested (in shares)     (204,623)  
Expired/Forfeited (in shares)     0  
Outstanding, ending balance (in shares) 830,833   830,833  
Weighted Average Exercise Price        
Outstanding, beginning balance (in dollars per share)     $ 4.09  
Granted (in dollars per share)     1.69  
Canceled (in dollars per share)     0  
Vested (in dollars per share)     1.63  
Expired/Forfeited (in dollars per share)     0  
Outstanding, ending balance (in dollars per share) $ 3.96   $ 3.96  
Other disclosures        
Compensation expense $ 37,000 $ 11,000 $ 84,000 $ 44,000
Unrecognized compensation expense $ 72,000   $ 72,000  
Weighted average period of recognition     1 year 6 months