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Equity Incentive Plans (Tables)

6 Months Ended

Jun. 30, 2021

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Changes in Shares Available for Grant

Changes in shares available for grant during the six months ended June 30, 2021 were as follows:

		Shares Available for Grant
Shares available for grant at December 31, 2020			18,617,001
2019 Plan reserve increase on January 1, 2021			6,882,344
Options and restricted stock units granted			(2,680,086	)
Options and restricted stock units forfeited, cancelled or expired			530,175
Shares available for grant at June 30, 2021			23,349,434

Summary of Stock Option Activity Under 2009 Plan and 2019 Plan

Stock option activity under the 2009 Plan and 2019 Plan during the six months ended June 30, 2021 was as follows:

		Shares Subject to Outstanding Options				Weighted-Average Exercise Price per Share				Aggregate Intrinsic Value (in thousands)
Options outstanding at December 31, 2020			14,433,560			$	12.82			$	668,458
Options granted			1,991,825				43.37
Options forfeited or cancelled			(493,858	)			21.80
Options expired			(19,626	)			16.38
Options exercised			(2,950,197	)			6.95
Options outstanding at June 30, 2021			12,961,704			$	18.50			$	300,793
Options vested and exercisable at June 30, 2021		6,739,178				$	9.25			$	213,508

Summary of Restricted Stock Unit Activity

Restricted stock unit activity under the 2019 Plan during the six months ended June 30, 2021 was as follows:

		Restricted Stock Units Outstanding				Weighted-Average Grant Date Fair Value per Share
Nonvested outstanding restricted stock units at December 31, 2020			50,000			$	28.10
Restricted stock units granted			688,261				42.93
Restricted stock units forfeited or cancelled			(16,691	)			47.79
Restricted stock units vested			(12,500	)			28.10
Nonvested outstanding restricted stock units at June 30, 2021			709,070			$	42.03

Summary of Estimated Grant Date Fair Value of Options Granted

The estimated grant date fair value of options granted during the six months ended June 30, 2021 and 2020 was estimated using the Black-Scholes option-pricing model with the following assumptions:

		Six Months Ended June 30,
		2021				2020
Fair value of common stock		$34.41 - $66.50				$17.68 - $41.90
Expected term (in years)		5.27 - 6.08				5.27 - 6.08
Risk-free interest rate		0.5% - 1.1%				0.4% - 1.7%
Expected volatility		67.1% - 68.7%				70.5% - 72.9%
Expected dividend yield			—				—

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

The compensation costs related to stock options and restricted stock units for the three and six months ended June 30, 2021 and 2020, respectively, are included on our unaudited condensed consolidated statements of operations as follows (in thousands):

		Three Months Ended June 30,								Six Months Ended June 30,
		2021				2020				2021				2020
Cost of revenue		$	408			$	209			$	736			$	381
Research and development			3,791				2,152				6,674				3,696
Sales and marketing			3,302				1,667				5,797				2,824
General and administrative			3,748				2,345				6,526				4,147
Total share-based compensation expense		$	11,249			$	6,373			$	19,733			$	11,048

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