Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands		12 Months Ended
	Feb. 29, 2024 USD ($)	Dec. 31, 2023 USD ($) segment performanceObligation restructuringObligation	Dec. 31, 2022 USD ($)
Concentration Risk [Line Items]
Net loss		$ 225,812	$ 1,989,934
Cash consumed in operations		60,697	117,597
Cash and cash equivalents		52,882	98,332
Available-for-sale securities		$ 17,398	141,062
Number of reportable segments | segment		1
Number of operating segments | segment		1
Allowance for doubtful accounts		$ 700	200
Receivables, write-offs		0	0
Impairment of long-lived assets		30,265	11,494
Goodwill and intangible assets impairments		60,499	1,822,089
Other expense, net		$ (245)	(856)
Number of contract performance obligations | performanceObligation		2
Advertising expense		$ 4,600	8,800
Number of restructuring obligation groups | restructuringObligation		4
Total revenues		$ 780,136	56,224
Crypto services
Concentration Risk [Line Items]
Total revenues		726,988	1,745
Loyalty redemption platform
Concentration Risk [Line Items]
Total revenues		53,148	54,479
Three Customers | Loyalty redemption platform
Concentration Risk [Line Items]
Total revenues		$ 33,200	$ 33,000
Three Customers | Accounts Receivable | Customer Concentration Risk
Concentration Risk [Line Items]
Customer concentration risk, percentage		44.00%	65.00%
Three Customers | Revenue from Contract with Customer Benchmark | Customer Concentration Risk | Crypto services
Concentration Risk [Line Items]
Customer concentration risk, percentage		86.00%
Three Customers | Revenue from Contract with Customer Benchmark | Customer Concentration Risk | Loyalty redemption platform
Concentration Risk [Line Items]
Customer concentration risk, percentage		63.00%	61.00%
One Customer | Crypto services
Concentration Risk [Line Items]
Total revenues		$ 529,600
Cryptoassets
Concentration Risk [Line Items]
Other expense, net		200	$ 0
Money Market Funds
Concentration Risk [Line Items]
Cash equivalents, invested in money market funds		$ 26,100	$ 200
Subsequent Event | Third-Party Offering
Concentration Risk [Line Items]
Net proceeds from sale of stock and warrants	$ 37,600
Subsequent Event | ICE Offering
Concentration Risk [Line Items]
Net proceeds from sale of stock and warrants	2,400
Expected net proceeds from sale of stock and warrants	$ 9,800