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
Dec. 31, 2020
Mar. 31, 2020
Prepaid Expenses and Other Current Assets [Line Items]          
Prepaid advertising contract with iHeart     $ 2,500 $ 1,788  
Other prepaid expenses and other current assets     1,758 2,286  
Total Prepaid expenses and other current assets     4,258 4,074  
Shares issued to third parties for services     46   $ 125
Other Noncurrent Assets | IHeartMedia          
Prepaid Expenses and Other Current Assets [Line Items]          
Prepaid advertising contract with iHeart     $ 500 $ 1,200  
Common Stock          
Prepaid Expenses and Other Current Assets [Line Items]          
Stock issued to third parties for services (in shares)     30,000   125,000
Common Stock | IHeartMedia          
Prepaid Expenses and Other Current Assets [Line Items]          
Stock issued to third parties for services (in shares) 125,000 1,000,000      
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]          
Stock issued to third parties for services (in shares)       500,000  
Shares issued to third parties for services       $ 500  
Common Stock | Other Counterparty | Marketing services          
Prepaid Expenses and Other Current Assets [Line Items]          
Stock issued to third parties for services (in shares)       500,000  
Shares issued to third parties for services       $ 500