Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash flows from operating activities:
Net loss	$ (32,364)	$ (38,268)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	5,511	4,182
Stock-based compensation expense	24,742	21,978
Amortization or accretion of marketable securities	(5,016)	510
Impairment of long-lived assets	535	1,886
Other	96	233
Changes in operating assets and liabilities:
Accounts receivable, net	(14,585)	(19,997)
Prepaid expenses and other assets	(5,396)	(11,467)
Operating lease right-of-use assets	1,197	1,271
Accounts payable and accrued expenses	19,440	(6,670)
Accrued compensation and other liabilities	(2,476)	(1,815)
Operating lease liabilities	(2,376)	(1,557)
Deferred revenue	15,384	11,457
Net cash provided by (used in) operating activities	4,692	(38,257)
Cash flows from investing activities:
Purchases of marketable securities	(121,756)	(180,552)
Proceeds from maturities of marketable securities	75,000	0
Purchases of property, equipment, and software	(298)	(400)
Capitalized internal-use software costs	(2,862)	(3,544)
Purchases of content assets	(624)	(617)
Net cash used in investing activities	(50,540)	(185,113)
Cash flows from financing activities:
Proceeds from exercise of stock options	5,354	6,947
Payment of deferred offering costs	0	(295)
Payment of tax withholding on vesting of restricted stock units	(13,036)	(2,625)
Net cash (used in) provided by financing activities	(7,682)	4,027
Net decrease in cash, cash equivalents, and restricted cash	(53,530)	(219,343)
Cash, cash equivalents, and restricted cash—Beginning of period	322,878	582,719
Cash, cash equivalents, and restricted cash—End of period	269,348	363,376
Reconciliation of cash, cash equivalents, and restricted cash:
Cash and cash equivalents	267,774	361,315
Restricted cash, non-current	1,574	2,061
Total cash, cash equivalents, and restricted cash	269,348	363,376
Supplemental disclosure of cash flow information:
Cash paid for income taxes	1,108	808
Supplemental disclosure of noncash investing and financing activities:
Stock-based compensation capitalized as internal-use software costs	$ 1,311	$ 1,249