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Fair Value of Financial Instruments - Schedule of Reconciliation of Changes in Liabilities Measured at Fair Value on a Recurring Basis (Details) - Level 3 [Member] - Warrant Liability [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Fair value liabilities of Level 3 instruments beginning of period $ 73 $ 425
Net unrealized (gain) loss on warrant valuation 22 (352)
Fair value liabilities of Level 3 instruments end of period $ 95 $ 73