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Revenue (Tables)
12 Months Ended
Dec. 31, 2021
Revenue from Contract with Customer [Abstract]  
Schedule of Deferred Revenue
The deferred revenue balances from contracts with customers were as follows:
Years Ended December 31,
(in thousands)202120202019
Deferred revenue, beginning of the period$1,105 $137 $96 
Deferred revenue, end of the period1,212 1,105 137 
Change in deferred revenue during the period$107 $968 $41