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Operating Leases - Balance Sheet Presentation (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Balance Sheet Captions |  |
Right-of-use assets | $ 492 | $ 574
Operating lease liabilities, current | 381 | 370
Operating lease liabilities | 536 | 624
Other assets |  |
Balance Sheet Captions |  |
Right-of-use assets | 492 | 574
Accrued liabilities |  |
Balance Sheet Captions |  |
Operating lease liabilities, current | 381 | 370
Other long-term liabilities |  |
Balance Sheet Captions |  |
Operating lease liabilities, noncurrent | $ 155 | $ 254

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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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