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
 1 Months Ended 3 Months Ended
Mar. 05, 2020
Aug. 28, 2019
Dec. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Sep. 30, 2021
Prepaid Expenses and Other Current Assets [Line Items]            
Prepaid advertising contract with iHeart     $ 1,788     $ 2,095
Other prepaid expenses and other current assets     2,286     1,631
Total Prepaid expenses and other current assets     4,074     $ 3,726
Stock 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     $ 1,200      
Common Stock            
Prepaid Expenses and Other Current Assets [Line Items]            
Stock issued to third parties for services (in shares)       5,000 20,833  
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        
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)     83,334      
Stock issued to third parties for services     $ 600      
Common Stock | Other Counterparty | Marketing services            
Prepaid Expenses and Other Current Assets [Line Items]            
Stock issued to third parties for services (in shares)     83,334      
Stock issued to third parties for services     $ 500