Stock Based Compensation - Summary of stock option activity (Detail) - $ / shares	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Available For Grant, Balance Beginning	28,974,067
Shares Available For Grant, Granted	(849,978)
Shares Available For Grant, Forfeited	385,867
Shares Available For Grant, Balance Ending	28,509,956	28,974,067
Options, Balance Beginning	18,724,096
Options, Granted	849,978
Options, Exercised	(901,406)
Options, Restricted stock unit awards released	(97,059)
Options, Forfeited	(360,313)
Options, Balance Ending	18,215,296	18,724,096
Weighted Average Exercise Price, Balance Beginning	$ 0.69
Weighted Average Exercise Price, Granted	16.60
Weighted Average Exercise Price, Exercised	0.23
Weighted Average Exercise Price, Forfeited	3.39
Weighted Average Exercise Price, Balance Ending	$ 1.26	$ 0.69
Weighted Average Contractual Term	6 years 1 month 6 days	6 years 6 months