Quarterly report pursuant to Section 13 or 15(d)

Prepaid expenses and other current assets (Details)

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Prepaid expenses and other current assets (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 05, 2020
Aug. 28, 2019
Mar. 31, 2021
Mar. 31, 2022
Dec. 31, 2021
Prepaid Expenses and Other Current Assets [Line Items]          
Prepaid advertising contract with iHeart       $ 2,095 $ 2,095
Other prepaid expenses and other current assets       779 845
Total Prepaid expenses and other current assets       $ 2,874 $ 2,940
Stock issued to third parties for services     $ 46    
Common Stock          
Prepaid Expenses and Other Current Assets [Line Items]          
Stock issued to third parties for services (in shares)     5,000    
Common Stock | IHeartMedia          
Prepaid Expenses and Other Current Assets [Line Items]          
Stock issued to third parties for services (in shares) 20,834 166,667      
Stock issued to third parties for services $ 100 $ 3,400