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Income Taxes - provision for income taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Current:    
Federal   $ 0
State $ 115 0
Total Current 115 0
Deferred:    
Federal   0
State   0
Total Deferred   0
Provision for income taxes 115 0
Fixed assets $ 27 $ 15