Annual report pursuant to Section 13 and 15(d)

Property and Equipment (Details Textual)

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Property and Equipment (Details Textual) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Abstract]      
Depreciation, nonproduction $ 0.9 $ 0.8 $ 0.5