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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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