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Summary of Significant Accounting Policies - Cumulative Effect of Changes from Adoption of ASU (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Assets        
Right of use assets $ 483 $ 604 $ 451 $ 0
Liabilities        
Current operating leases 198 189 126 0
Long-term operating leases 285 415 325 0
Total lease liabilities $ 483 $ 604 451 $ 0
Accounting Standards Update 2016-02        
Assets        
Right of use assets     451  
Liabilities        
Current operating leases     126  
Long-term operating leases     325  
Total lease liabilities     $ 451