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Summary of significant accounting policies - Additional Information (Details) $ / shares in Units, $ in Thousands			3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2021 USD ($) $ / shares	Jun. 16, 2021 $ / shares shares	Jun. 30, 2021 USD ($) $ / shares	Mar. 31, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) segment $ / shares	Jun. 30, 2020 USD ($)	Jun. 30, 2022 USD ($)	Jan. 01, 2021 USD ($)	Dec. 31, 2020 USD ($)
Accounting Policies [Line Items]
Allowance of bad debt	$ 700		$ 700			$ 700
Deferred revenue	6,900		6,900			6,900				$ 5,300
Revenue recognized				$ 5,300
Income tax expense (benefit)			392		$ 0	151	$ 0
Advertising expense			4,800		2,600	7,800	4,300
Political contributions			300		$ 100	300	$ 300
Period of exchange agreement		180 days
Shares converted basis (in shares) \| shares		1
Total stock-based compensation	$ 19,400		$ 19,433			19,433
Award modification, incremental expense						$ 4,100
Number of operating segments \| segment						1
Number of reportable segments \| segment						1
Tax receivable agreement liabilities as percent of expected benefit	85.00%		85.00%			85.00%
Tax receivable agreement, percent recorded in additional paid-in capital	15.00%		15.00%			15.00%
Operating lease, right-of-use asset	$ 38,779		$ 38,779			$ 38,779			$ 43,300
Operating lease liabilities	$ 47,258		$ 47,258			$ 47,258			$ 48,400
Class V Common Stock
Accounting Policies [Line Items]
Common stock, par value (in dollars per share) \| $ / shares	$ 0.0001	$ 0.0001	$ 0.0001			$ 0.0001
Class A Common Stock, $0.0001 par value per share
Accounting Policies [Line Items]
Common stock, par value (in dollars per share) \| $ / shares	$ 0.0001		$ 0.0001			$ 0.0001
Payment to continuing members as percent of amount of tax benefit	85.00%		85.00%			85.00%
Forecast
Accounting Policies [Line Items]
Revenue recognized								$ 6,900
Class P Units
Accounting Policies [Line Items]
Nonvested award, cost not yet recognized	$ 5,700		$ 5,700			$ 5,700
Nonvested award, period for recognition						2 years 4 months 24 days
Silver Spike \| Legacy WMH Class A Unit holders
Accounting Policies [Line Items]
Percentage of voting interests held (over 50%)	50.00%		50.00%			50.00%