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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

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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
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