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
Aug. 28, 2020
Mar. 05, 2020
Aug. 28, 2019
Dec. 31, 2020
Dec. 31, 2019
Prepaid Expenses and Other Current Assets [Line Items]            
Prepaid advertising contract with iHeart $ 1,788       $ 1,788 $ 1,776
Other prepaid expenses and other current assets 2,286       2,286 865
Total Prepaid expenses and other current assets $ 4,074       4,074 2,641
Shares issued to third parties for services (in shares)       1,000,000    
Shares issued to third parties for services       $ 3,400 1,372 3,477
IHeartMedia            
Prepaid Expenses and Other Current Assets [Line Items]            
Committed usage amount of media inventory       $ 1,700    
Prepaid services agreement term   1 year        
Other Counterparty | Access to investment platform            
Prepaid Expenses and Other Current Assets [Line Items]            
Prepaid services agreement term 1 year          
Other Noncurrent Assets | IHeartMedia            
Prepaid Expenses and Other Current Assets [Line Items]            
Prepaid advertising contract with iHeart $ 1,200       $ 1,200 $ 1,100
Common Stock            
Prepaid Expenses and Other Current Assets [Line Items]            
Shares issued to third parties for services (in shares)         1,160,000 1,008,500
Shares issued to third parties for services         $ 1 $ 1
Common Stock | IHeartMedia            
Prepaid Expenses and Other Current Assets [Line Items]            
Shares 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]            
Shares issued to third parties for services (in shares) 500,000          
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) 500,000          
Shares issued to third parties for services $ 500