Annual report pursuant to Section 13 and 15(d)

REVENUE FROM CONTRACTS WITH CUSTOMERS (Details)

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REVENUE FROM CONTRACTS WITH CUSTOMERS (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disaggregation of Revenue [Line Items]      
Net revenue $ 287,419,000 $ 269,882,000 $ 239,421,000
Contract assets 0 0  
United States      
Disaggregation of Revenue [Line Items]      
Net revenue 250,252,000 228,568,000 200,418,000
All other countries      
Disaggregation of Revenue [Line Items]      
Net revenue 37,167,000 41,314,000 39,003,000
Over time | Virtual currency (over time)      
Disaggregation of Revenue [Line Items]      
Net revenue 280,087,000 268,137,000 231,726,000
Point in time | Advertising (point in time)      
Disaggregation of Revenue [Line Items]      
Net revenue 6,964,000 1,745,000 383,000
Point in time | Other revenue (point in time)      
Disaggregation of Revenue [Line Items]      
Net revenue $ 368,000 $ 0 $ 7,312,000