Stock-Based Compensation Expense and Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2023

Schedule of Employee and Non-Employee Stock-Based Compensation Expense

The following table summarizes the components of stock-based compensation expense in the condensed consolidated statements of operations (in thousands):


	Three Months Ended September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022

Cost of revenue	$	5,581	$	4,982	$	14,809	$	13,609
Research and development	5,585		4,818		21,673		25,113
Sales and marketing	3,015		3,948		15,089		13,528
General and administrative	7,383		10,283		28,025		30,688
	$	21,564	$	24,031	$	79,596	$	82,938

Schedule of Stock Option Activity

The following table summarizes the stock option activity under our stock plans during the reporting period:


	Outstanding Options
	Number of Shares	Weighted Average Exercise Price		Remaining Contractual Life (Years)	Aggregate Intrinsic Value
	(in thousands, except weighted average exercise price and remaining contractual life)
Balances at December 31, 2022	8,748,309	$	20.70	4.6	$	40,532

Exercised	(332,293)	7.94

Expired	(541,302)	26.95
Balances at September 30, 2023	7,874,714	20.81		3.8	17,890
Vested and expected to vest at September 30, 2023	7,873,962	20.81		3.8	17,885
Exercisable at September 30, 2023	7,844,713	$	20.86	3.8	$	17,707

The following table presents the stock activity and the total number of shares available for grant under our stock plans:


						Plan Shares Available for Grant

Balances at December 31, 2022						28,340,641
Added to plan						8,948,255
Granted						(4,734,700)

Cancelled/forfeited						1,899,563
Expired						(504,347)
Balances at September 30, 2023						33,949,412

Schedule of Stock Award Activity

A summary of our stock awards activity and related information is as follows:


	Number of Awards Outstanding	Weighted Average Grant Date Fair Value

Unvested Balance at December 31, 2022	9,549,035	$	19.99
Granted	4,814,465	18.37
Vested	(3,496,491)	18.87
Forfeited	(1,428,026)	21.44
Unvested Balance at September 30, 2023	9,438,983	$	19.36