Annual report pursuant to Section 13 and 15(d)

Prepaid expenses and other current assets (Details)

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Prepaid expenses and other current assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Mar. 05, 2020
Aug. 28, 2019
Dec. 31, 2021
Dec. 31, 2020
Prepaid Expenses and Other Current Assets [Line Items]          
Prepaid advertising contract with iHeart $ 1,788     $ 2,095 $ 1,788
Other prepaid expenses and other current assets 2,286     845 2,286
Total Prepaid expenses and other current assets 4,074     2,940 4,074
Shares issued to third-parties for services       $ 46 1,372
Other Noncurrent Assets | IHeartMedia          
Prepaid Expenses and Other Current Assets [Line Items]          
Prepaid advertising contract with iHeart $ 1,200       $ 1,200
Common Stock          
Prepaid Expenses and Other Current Assets [Line Items]          
Shares issued to third parties for services (in shares)       5,000 193,333
Common Stock | IHeartMedia          
Prepaid Expenses and Other Current Assets [Line Items]          
Shares issued to third parties for services (in shares)   20,834 166,667    
Shares issued to third-parties for services   $ 100 $ 3,400    
Common Stock | Other Counterparty | Access to investment platform          
Prepaid Expenses and Other Current Assets [Line Items]          
Shares issued to third parties for services (in shares) 83,334        
Shares issued to third-parties for services $ 600        
Common Stock | Other Counterparty | Marketing services          
Prepaid Expenses and Other Current Assets [Line Items]          
Shares issued to third parties for services (in shares) 83,334        
Shares issued to third-parties for services $ 500