CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock Common Stock—Class A	Common Stock Common Stock—Class A Vesting of restricted stock units	Common Stock Common Stock—Class A Vesting of restricted stock awards	Common Stock Common Stock—Class B	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2020		103,394			10,229
Beginning balance at Dec. 31, 2020	$ 1,061,865	$ 1			$ 1	$ 1,350,050	$ 6	$ (288,193)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of vested stock options (in shares)		1,029
Exercise of vested stock options	5,605					5,605
Vesting of early exercised stock options (in shares)					29
Vesting of early exercised stock options	128					128
Vesting of restricted stock units/awards (in shares)			909	224
Shares issued under ESPP (in shares)		154
Shares issued under ESPP	5,719					5,719
Stock-based compensation	65,018					65,018
Conversion of Class B to Class A Stock (in shares)		549			(549)
Net loss	(108,978)							(108,978)
Other comprehensive income (loss)	(267)						(267)
Ending balance (in shares) at Jun. 30, 2021		106,259			9,708
Ending balance at Jun. 30, 2021	1,029,090	$ 1			$ 1	1,426,520	(261)	(397,171)
Beginning balance (in shares) at Mar. 31, 2021		104,950			9,891
Beginning balance at Mar. 31, 2021	1,045,034	$ 1			$ 1	1,384,045	(137)	(338,876)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of vested stock options (in shares)		428
Exercise of vested stock options	2,886					2,886
Vesting of early exercised stock options (in shares)					14
Vesting of early exercised stock options	64					64
Vesting of restricted stock units/awards (in shares)			419	112
Shares issued under ESPP (in shares)		153
Shares issued under ESPP	5,719					5,719
Stock-based compensation	33,806					33,806
Conversion of Class B to Class A Stock (in shares)		197			(197)
Net loss	(58,295)							(58,295)
Other comprehensive income (loss)	(124)						(124)
Ending balance (in shares) at Jun. 30, 2021		106,259			9,708
Ending balance at Jun. 30, 2021	1,029,090	$ 1			$ 1	1,426,520	(261)	(397,171)
Beginning balance (in shares) at Dec. 31, 2021		118,811
Beginning balance at Dec. 31, 2021	$ 1,013,953	$ 2				1,527,468	(2,627)	(510,890)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of vested stock options (in shares)	1,624	1,624
Exercise of vested stock options	$ 4,769					4,769
Vesting of restricted stock units/awards (in shares)			1,083	75
Shares issued under ESPP (in shares)		292
Shares issued under ESPP	2,962					2,962
Stock-based compensation	62,670					62,670
Net loss	(80,701)							(80,701)
Other comprehensive income (loss)	(9,915)						(9,915)
Ending balance (in shares) at Jun. 30, 2022		121,885
Ending balance at Jun. 30, 2022	993,738	$ 2				1,597,869	(12,542)	(591,591)
Beginning balance (in shares) at Mar. 31, 2022		120,777
Beginning balance at Mar. 31, 2022	976,723	$ 2				1,561,371	(9,496)	(575,154)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of vested stock options (in shares)		273
Exercise of vested stock options	1,721					1,721
Vesting of restricted stock units/awards (in shares)			506	37
Shares issued under ESPP (in shares)		292
Shares issued under ESPP	2,962					2,962
Stock-based compensation	31,815					31,815
Net loss	(16,437)							(16,437)
Other comprehensive income (loss)	(3,046)						(3,046)
Ending balance (in shares) at Jun. 30, 2022		121,885
Ending balance at Jun. 30, 2022	$ 993,738	$ 2				$ 1,597,869	$ (12,542)	$ (591,591)