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Stock-Based Compensation - Outstanding RSU's under the 2016 Plan (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Jan. 31, 2021
Jan. 31, 2020
Oct. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Weighted Average Fair Value          
Restricted stock liability       $ 204 $ 159
Restricted Stock Units (RSUs)          
Number of Shares          
Settled in cash (92,500) (90,500) (90,500)    
Weighted Average Fair Value          
Fair value       1,112  
Unrecognized costs       $ 690  
Unrecognized costs weighted-average period       2 years 2 months 16 days  
Stock-based compensation expense       $ 204 $ 265
Restricted Stock Units (RSUs) | Executive Officer [Member]          
Number of Shares          
Awarded       660,606  
Weighted Average Fair Value          
Vesting period       3 years  
Stock-based compensation expense       $ 248  
2016 Plan | Restricted Stock Units (RSUs)          
Number of Shares          
Outstanding at the beginning 753,106 90,500   90,500  
Awarded       753,106 181,000
Settled in cash       (90,500) (90,500)
Outstanding at the end       753,106 90,500
Weighted Average Fair Value          
Outstanding at the beginning (in dollars per share) $ 1.52 $ 1.76   $ 1.76  
Awarded (in dollars per share)       1.49 $ 1.74
Settled in cash (in dollars per share)       1.76 1.17
Outstanding at the end (in dollars per share)       $ 1.52 $ 1.76