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Balance Sheet Components - Summary of Accrued and Other Current Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Organization Consolidation And Presentation Of Financial Statements [Abstract] |  |
Accrued expenses | $ 2,569 | $ 1,971
Current portion of lease liabilities | 486 | 395
Short term interest payable | 272 | 274
Other accrued liabilities | 510 | 446
Total accrued and other current liabilities | $ 3,837 | $ 3,086

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- Definition Present value of lessee's discounted obligation for lease payments from operating lease, classified as current. + 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 (b) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
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