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Prepaid Expenses and Other Current Assets (Tables)
12 Months Ended
Dec. 31, 2021
Prepaid Expense and Other Assets, Current [Abstract]  
Schedule of Prepaid Expenses and Other Current Assets
Prepaid expenses and other current assets consisted of the following:
 Year Ended December 31,
 20212020
Prepaid expenses$2,432 $2,797 
Unbilled receivable518 2,571 
Interest receivable on marketable securities247 — 
 $3,197 $5,368