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Discontinued Operation - Summary of Assets and Liabilities From Discontinued Operation (Details) - Discontinued Operations, Disposed of by Sale - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
ASSETS |  |
Cash, cash equivalents and restricted cash | $ 43 | $ 146
Accounts receivable, net | 0 | 69
Prepaid expenses and other | 20 | 15
Total assets from discontinued operations | 63 | 230
LIABILITIES |  |
Accounts payable | 457 | 611
Accrued expenses and other | 0 | 48
Deferred revenue | 12 | 12
Total liabilities from discontinued operations | $ 469 | $ 671

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