Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2020

Equity [Abstract]

Summary of Stock Option Activity and Weighted Average Exercise Prices

The following table summarizes the Company’s stock option activity and weighted-average exercise prices:

	Number Of Options Outstanding			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Life (in Years)		Aggregate Intrinsic Value (in thousands)
Balance outstanding—December 31, 2019		36,384,767		$	2.96		7.6	$	1,266,938
Options granted		14,600			41.19
Options exercised		(7,555,561	)		1.64
Options forfeited or expired		(511,680	)		4.63
Balance outstanding—September 30, 2020		28,332,126		$	3.31		6.9	$	2,800,772

Summary of Activity for Unvested RSUs

The following table summarizes the activity for the Company’s unvested RSUs:

	Shares			Weighted- Average Fair Value
Balance—December 31, 2019		647,094		$	36.08
Awarded		4,102,243			54.12
Vested		(8,234	)		35.81
Forfeited/canceled		(101,468	)		42.97
Unvested and outstanding—September 30, 2020		4,639,635		$	51.88

Summary of Stock-based Compensation Expense

Stock-based compensation expense was included in the condensed consolidated statement of operations as follows (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2020		2019		2020		2019
Cost of revenue	$	529	$	161	$	1,167	$	372
Research and development		10,173		1,934		24,723		3,709
Sales and marketing		6,068		1,540		13,683		3,276
General and administrative		3,946		1,042		10,037		2,659
Stock-based compensation, net of amounts capitalized		20,716		4,677		49,610		10,016
Capitalized stock-based compensation expense		1,220		14		1,521		137
Total stock-based compensation expense	$	21,936	$	4,691	$	51,131	$	10,153