Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Cash flows from operating activities:
Net loss	$ (101,722)	$ (38,642)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	15,616	10,400
Amortization of deferred sales commissions	22,558	11,995
Stock-based compensation	53,043	23,704
Provision for doubtful accounts	467	324
Accretion of marketable securities	(138)	0
Non-cash operating lease expense	4,643	0
Unrealized loss on strategic investments	2,896	0
Other	460	0
Changes in operating assets and liabilities:
Accounts receivable	1,132	5,715
Prepaid expenses and other assets	1,375	(6,252)
Deferred contract costs	(40,203)	(25,455)
Accounts payable, accrued expenses and other liabilities	(14,257)	(13,455)
Content costs payable	(1,525)	(989)
Operating lease liabilities	(5,012)	0
Deferred revenue	30,395	23,234
Net cash used in operating activities	(30,272)	(9,421)
Cash flows from investing activities:
Purchases of marketable securities	(66,128)	0
Purchases of property and equipment	(1,397)	(4,554)
Capitalized software costs	(10,652)	(9,767)
Purchases of strategic investments	(5,000)	0
Payments related to business combination, net of cash acquired	(1,500)	(24,490)
Net cash used in investing activities	(84,677)	(38,811)
Cash flows from financing activities:
Net proceeds from exercise of stock options	5,785	7,619
Proceeds from share purchases under employee stock purchase plan	5,563	0
Payment of redeemable convertible preferred stock issuance costs	0	(2,250)
Payment of deferred offering costs	(1,586)	(1,992)
Net proceeds from exercise of Series A-1 redeemable convertible preferred stock warrants	0	2
Net cash provided by financing activities	9,762	3,379
Effect of foreign exchange rates on cash flows	(38)	0
Net decrease in cash, cash equivalents and restricted cash	(105,225)	(44,853)
Cash, cash equivalents and restricted cash—Beginning of period	536,768	177,931
Cash, cash equivalents and restricted cash—End of period	431,543	133,078
Reconciliation of cash, cash equivalents, and restricted cash:
Cash and cash equivalents	427,914	130,178
Restricted cash	3,629	2,900
Total cash, cash equivalents, and restricted cash	431,543	133,078
Supplemental disclosures of cash flow information:
Interest paid	13	72
Income taxes paid	516	385
Supplemental disclosure of non-cash investing and financing activities:
Unpaid deferred offering costs	0	3,090
Stock-based compensation in capitalized costs	4,310	1,451
Acquisition holdback liability	0	1,500
Changes in purchases of property and equipment in accounts payable and accrued expenses	108	119
Unrealized gains and losses on marketable securities	$ 215	$ 0