Equity Incentive Plans (Tables)

6 Months Ended

Jun. 30, 2021

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Operational Milestone Based on Revenue or Adjusted EBITDA

The achievement status of the operational milestones as of June 30, 2021 is provided below. Although an operational milestone is deemed achieved in the last quarter of the relevant annualized period, it may be certified only after the financial statements supporting its achievement have been filed with our Forms 10-Q and/or 10-K.

Total Annualized Revenue			Annualized Adjusted EBITDA
Milestone (in billions)		Achievement Status	Milestone (in billions)		Achievement Status
$	20.0	Achieved	$	1.5	Achieved
$	35.0	Achieved	$	3.0	Achieved
$	55.0	Probable	$	4.5	Achieved
$	75.0	-	$	6.0	Achieved
$	100.0	-	$	8.0	Probable
$	125.0	-	$	10.0	Probable
$	150.0	-	$	12.0	-
$	175.0	-	$	14.0	-

Summary of Stock-Based Compensation Expense

The following table summarizes our stock-based compensation expense by line item in the consolidated statements of operations (in millions):

	Three Months Ended June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
Cost of revenues	$	108	$	52	$	211	$	85
Research and development		104		73		229		138
Selling, general and administrative		262		222		648		335
Total	$	474	$	347	$	1,088	$	558