Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 424,796	$ 580,658
Marketable securities	361,025	241,117
Accounts receivable, net of allowance for doubtful accounts of $260 and $105 as of September 30, 2022 and December 31, 2021, respectively	54,567	34,396
Deferred costs, net	25,610	19,666
Prepaid expenses and other current assets	22,291	16,494
Total current assets	888,289	892,331
Property, equipment and software, net	28,118	24,725
Operating lease right-of-use assets	10,789	16,321
Intangible assets, net	8,985	10,091
Restricted cash	2,061	2,061
Other assets	18,014	13,381
Total assets	956,256	958,910
Current liabilities:
Educator partners payable	62,182	49,206
Other accounts payable and accrued expenses	27,702	23,257
Accrued compensation and benefits	13,563	18,353
Operating lease liabilities, current	8,085	8,031
Deferred revenue, current	116,592	94,637
Other current liabilities	7,608	7,639
Total current liabilities	235,732	201,123
Operating lease liabilities, non-current	7,417	11,864
Deferred revenue, non-current	3,239	3,851
Other liabilities	887	559
Total liabilities	247,275	217,397
Commitments and contingencies (Note 12)
Stockholders' equity:
Preferred stock, $0.00001 par value-10,000,000 shares authorized as of September 30, 2022 and December 31, 2021; no shares issued and outstanding as of September 30, 2022 and December 31, 2021	0	0
Common stock, $0.00001 par value-300,000,000 shares authorized as of September 30, 2022 and December 31, 2021; 149,205,936 shares issued and 146,457,998 shares outstanding as of September 30, 2022, and 144,653,979 shares issued and 141,906,041 shares outstanding as of December 31, 2021	1	1
Additional paid-in capital	1,327,566	1,235,231
Treasury stock- at cost, 2,747,938 shares as of September 30, 2022 and December 31, 2021	(4,701)	(4,701)
Accumulated other comprehensive loss	(1,479)	(252)
Accumulated deficit	(612,406)	(488,766)
Total stockholders' equity	708,981	741,513
Total liabilities and stockholders' equity	$ 956,256	$ 958,910