Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities:
Net loss	$ (153,875)	$ (80,026)	$ (77,620)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	21,216	15,297	11,055
Amortization of deferred sales commissions	32,279	17,801	7,486
Stock-based compensation	81,293	34,680	31,618
Allowance for credit losses	960	326	182
Accretion of marketable securities	(896)	0	0
Non-cash operating lease expense	6,205	0	0
Unrealized loss on strategic investments	2,896	0	0
Other	690	0	52
Changes in operating assets and liabilities:
Accounts receivable	(32,309)	(27,000)	(19,632)
Prepaid expenses and other assets	(4)	(9,903)	(3,344)
Deferred contract costs	(53,379)	(36,508)	(18,943)
Accounts payable, accrued expenses and other liabilities	(28,620)	7,272	17,488
Content costs payable	1,349	4,389	6,615
Operating lease liabilities	(6,487)	0	0
Deferred revenue	67,725	66,568	54,667
Net cash provided by (used in) operating activities	(60,957)	(7,104)	9,624
Cash flows from investing activities:
Purchases of marketable securities	(158,503)	0	0
Proceeds from maturities of marketable securities	7,500	0	0
Purchases of property and equipment	(1,564)	(5,335)	(5,180)
Capitalized software costs	(14,160)	(12,868)	(9,357)
Purchases of strategic investments	(5,000)	(10,000)	0
Payments related to business combination, net of cash acquired	(1,500)	(24,490)	0
Net cash used in investing activities	(173,227)	(52,693)	(14,537)
Cash flows from financing activities:
Net proceeds from exercise of stock options	7,149	10,878	10,383
Net proceeds from issuance of redeemable convertible preferred stock	0	2	120,710
Proceeds from share purchases under employee stock purchase plan	9,192	0	0
Payment of redeemable convertible preferred stock issuance costs	0	(2,250)	0
Payment of deferred offering costs	(1,586)	(5,183)	0
Cash proceeds from initial public offering	0	415,187	0
Net cash provided by financing activities	14,755	418,634	131,093
Effect of foreign exchange rates on cash flows	(25)	0	0
Net increase (decrease) in cash, cash equivalents and restricted cash	(219,454)	358,837	126,180
Cash, cash equivalents and restricted cash—Beginning of period	536,768	177,931	51,751
Cash, cash equivalents and restricted cash—End of period	317,314	536,768	177,931
Reconciliation of cash, cash equivalents and restricted cash:
Cash and cash equivalents	313,685	533,868	175,031
Restricted cash	3,629	2,900	2,900
Total cash, cash equivalents and restricted cash	317,314	536,768	177,931
Supplemental disclosures of cash flow information:
Interest paid	23	90	48
Income taxes paid	678	385	154
Supplemental disclosure of non-cash investing and financing activities:
Accrued redeemable convertible preferred stock issuance costs	0	0	2,250
Unpaid deferred offering costs	0	1,586	0
Stock-based compensation in capitalized costs	5,911	2,571	749
Acquisition holdback liability	0	1,500	0
Changes in purchases of property and equipment in accounts payable and accrued expenses	22	(186)	131
Vesting of early-exercised stock options, net	0	0	7
Unrealized losses on marketable securities	$ 213	$ 0	$ 0