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Stock-Based Awards - Summary of Stock Option Activity (Details) - Equity Incentive Plan [Member] - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Restricted Stock Units [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of RSUs Outstanding, Beginning balance 50,000
Number of RSUs Outstanding, Restricted stock units granted   50,000
Number of RSUs Outstanding, Options granted
Number of RSUs Outstanding, Options expired/forfeited
Number of RSUs Outstanding, Restricted stock units vested (22,000)  
Number of RSUs Outstanding, Ending balance 28,000 50,000
Stock Option [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares Available for Grant, Beginning balance 1,054,000 1,731,000
Shares Available for Grant, Restricted stock units granted   (100,000)
Shares Available for Grant, Options granted (303,000) (677,000)
Shares Available for Grant, Options expired/forfeited 295,000 100,000
Shares Available for Grant, Restricted stock units vested  
Shares Available for Grant, Ending balance 1,046,000 1,054,000
Number of Options Outstanding, Beginning balance 2,846,000 2,269,000
Number of Options Outstanding, Restricted stock units granted  
Number of Options Outstanding, Options granted 303,000 677,000
Number of Options Outstanding, Options expired/forfeited (295,000) (100,000)
Number of Options Outstanding, Restricted stock units vested  
Number of Options Outstanding, Ending balance 2,854,000 2,846,000
Number of Options Outstanding, Exercisable, Ending balance 1,954,000  
Weighted Average Exercise Price, Outstanding, Beginning balance $ 2.74 $ 2.42
Weighted Average Exercise Price, Restricted stock units granted  
Weighted Average Exercise Price, Options granted 0.74 3.92
Weighted Average Exercise Price, Options expired/forfeited 2.89 3.48
Weighted Average Exercise Price, Restricted stock units vested  
Weighted Average Exercise Price, Outstanding, Ending balance 2.51 $ 2.74
Weighted Average Exercise Price, Eercisable, Ending balance $ 2.59