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Subsequent events	12 Months Ended
Subsequent events	Dec. 31, 2021
Subsequent Events [Abstract]
Subsequent events	Subsequent events In preparing the consolidated financial statements as of December 31, 2021 and for the fiscal years ended December 31, 2021, 2020, and 2019 the Company has evaluated subsequent events through March 25, 2022, the date the consolidated financial statements were available for issuance. On February 15, 2022, the Company granted 1,683,039 RSUs to employees at a grant date fair value of $14.32 per share that generally vest over a four-year period. On February 28, 2022, the Company completed the second tranche purchase of $5.0 million of preferred stock as a part of its strategic investment in a privately held online education platform technology company.