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Operating Leases - Balance Sheet Presentation (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Balance Sheet    
Right-of-use assets $ 574 $ 906
Operating lease liabilities, current 370 354
Operating lease liabilities $ 624 $ 977
Right-of-use asset, balance sheet line item us-gaap:OtherAssets us-gaap:OtherAssets
Operating lease liabilities, current, balance sheet line item us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent
Operating lease liabilities, noncurrent, balance sheet line item us-gaap:OtherLiabilitiesNoncurrent us-gaap:OtherLiabilitiesNoncurrent
Other assets    
Balance Sheet    
Right-of-use assets $ 574 $ 906
Accrued liabilities    
Balance Sheet    
Operating lease liabilities, current 370 353
Other long-term liabilities    
Balance Sheet    
Operating lease liabilities, noncurrent $ 254 $ 624