Quarterly report pursuant to Section 13 or 15(d)

REVENUE - Narrative (Details)

v3.21.2
REVENUE - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Disaggregation of Revenue [Line Items]          
Discounts and incentives $ 5,000 $ 2,800 $ 12,500 $ 6,400  
Gross receivables from members and customers 60,500   60,500   $ 38,600
Undeposited funds 14,000   14,000   14,100
Allowance for expected credit losses 5,500   5,500   2,300
Revenue 301,978 194,781 849,215 485,208  
Capitalized sales commission and referral fees 3,400 100 7,400 2,200  
Capitalized contract cost, amortization 2,400 $ 200 5,900 $ 3,900  
Prepaid Expenses and Other Current Assets          
Disaggregation of Revenue [Line Items]          
Capitalized contract cost, net 6,200   6,200   5,000
Other Noncurrent Assets          
Disaggregation of Revenue [Line Items]          
Capitalized contract cost, net $ 1,000   $ 1,000   $ 800