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Prepaid and Other Current Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Prepaid expenses $ 3,980 $ 549
Demonstration units 224 0
Other 847 847
Prepaid and other current assets $ 5,051 $ 1,396