Employee Benefit Plans - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2017	Nov. 30, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Employer matching contribution, percent of match	100.00%
Employer matching contribution, percent of employees' gross pay	4.00%
Employer maximum annual contributions per employee, percent	4.00%
Employer discretionary contribution amount	$ 300,000	$ 400,000
Employers matching contribution, vesting percentage	100.00%
Stock options, granted	1,937,968
Cost not yet recognized, period for recognition	4 years 9 months 10 days
Stock options, grants in period, weighted average grant date fair value	$ 3.36	$ 1.82
Stock compensation expense recognized	$ 42,713,000	$ 1,977,000
Unvested stock options, unrecognized stock-based compensation	511,500,000		$ 14,900,000
Stock options, outstanding, intrinsic value	$ 187,800,000
Stock options, outstanding, weighted average remaining contractual term	7 years 3 months 18 days
Stock options, exercisable, number	21,957,416
Stock options, exercisable, intrinsic value	$ 120,100,000
Stock options, exercisable, weighted average exercise price	$ 2.09
Stock options, exercisable, weighted average remaining contractual term	6 years 5 months 4 days
Stock options	$ 6,500,000	100,000
Warrants issued to purchase common stock shares				122,052	139,629
Exercise price of warrants				$ 3.45	$ 2.61
Total fair value of warrants vested	0.0	1,000,000.0
Stock Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock compensation expense recognized	$ 3,694,000	1,977,000
RSUs [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options, grants in period, weighted average grant date fair value	$ 16.02
Stock compensation expense recognized	$ 14,052,000	0
PRSUs [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Cost not yet recognized, period for recognition	4 years 9 months 10 days
Stock options, grants in period, weighted average grant date fair value	$ 9.59
Stock compensation expense recognized	$ 24,967,000	0
Unvested stock options, unrecognized stock-based compensation	238,300,000
2014 Equity Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Proceeds from stock options exercised	$ 1,200,000	$ 100,000
2014 Equity Incentive Plan [Member] | Stock Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Terms of award	The exercise prices, vesting and other restrictions are determined at the discretion of the Board, except that the exercise price per share of incentive stock options may not be less than 100% of the fair value of a share of common stock on the date of grant.
Expiration period	10 years
Vesting period	4 years
2020 Equity And Management Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common Stock, Par or Stated Value Per Share	$ 0.0001