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Equity Incentive Plans (Tables)

12 Months Ended

Dec. 31, 2020

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Changes in Shares Available for Grant

Changes in shares available for grant during the year ended December 31, 2020 were as follows:

		Shares Available for Grant
Shares available for grant at December 31, 2019			15,396,254
2019 Plan reserve increase on January 1, 2020			6,261,907
Options and restricted stock units granted			(3,291,701	)
Options forfeited, cancelled or expired			250,541
Shares available for grant at December 31, 2020			18,617,001

Summary of Stock Option Activity Under 2008 Plan 2009 Plan and 2019 Plan

Stock option activity under the 2008 Plan, 2009 Plan and 2019 Plan during the year ended December 31, 2020 was as follows:

		Shares Subject to Outstanding Options				Weighted- Average Exercise Price per Share				Aggregate Intrinsic Value (in thousands)
Options outstanding at December 31, 2019			16,646,654			$	6.14			$	398,379
Options granted			3,241,701				33.36
Options forfeited or cancelled			(235,541	)			16.17
Options expired			(15,000	)			0.16
Options exercised			(5,204,254	)			4.14
Options outstanding at December 31, 2020			14,433,560			$	12.82			$	668,458
Options vested and exercisable at December 31, 2020			7,924,779			$	6.41			$	417,801

Summary of Restricted Stock Unit Activity

Restricted stock unit activity under the 2019 Plan during the year ended December 31, 2020 was as follows:

		Restricted Stock Units Outstanding				Weighted- Average Grant Date Fair Value per Share
Nonvested outstanding restricted stock units at December 31, 2019			4,500			$	41.63
Restricted stock units granted			50,000				28.10
Restricted stock units vested			(4,500	)			41.63
Nonvested outstanding restricted stock units at December 31, 2020			50,000			$	28.10

Summary of Estimated Grant Date Fair Value of Options Granted

The estimated grant date fair value of options granted during the year ended December 31, 2020, 2019 and 2018 was estimated using the Black-Scholes option-pricing model with the following assumptions:

		Year Ended December 31,
		2020				2019				2018
Fair value of common stock		$17.68 - $55.23				$7.80 - $47.81				$6.55
Expected term (in years)		5.27 - 6.08				5.27 - 6.08				6.08 - 10.00
Risk-free interest rate		0.4% - 1.7%				1.4% - 2.5%				2.6% - 3.0%
Expected volatility		70.5% - 73.3%				64.3% - 72.9%				65.0% - 69.2%
Expected dividend yield			—				—				—

Summary of Compensation Costs Related to Stock Options and RSUs Included on Statements of Operations

The compensation costs related to stock options and restricted stock units for the years ended December 31, 2020, 2019 and 2018 are included on our statements of operations as follows (in thousands):

		Year Ended December 31,
		2020				2019				2018
Cost of revenue		$	817			$	555			$	398
Research and development			8,519				3,934				2,896
Sales and marketing			6,627				3,480				2,891
General and administration			8,798				5,155				4,964
Total share-based compensation expense		$	24,761			$	13,124			$	11,149

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