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

9 Months Ended

Sep. 30, 2022

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,
	2022		2021		2022		2021

Cost of revenue	$	4,982	$	2,945	$	13,609	$	9,749
Research and development	4,818		5,678		25,113		15,876
Sales and marketing	3,948		4,391		13,528		12,486
General and administrative	10,283		7,952		30,688		19,198
	$	24,031	$	20,966	$	82,938	$	57,309

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)












Balances at December 31, 2021	10,737,295	$	21.23	5.2	$	60,304

Exercised	(468,821)	7.52
Forfeited	(42,742)	6.97
Expired	(1,229,091)	30.38
Balances at September 30, 2022	8,996,641	20.77		4.8	45,054
Vested and expected to vest at September 30, 2022	8,985,005	20.78		4.8	44,901
Exercisable at September 30, 2022	8,598,209	$	21.46	4.7	39,364

The following table presents the stock activity for the nine months ended September 30, 2022, and the total number of shares available for grant under our stock plans as of September 30, 2022:


						Plan Shares Available for Grant
Balances at December 31, 2021						24,146,784
Added to plan						8,384,460
Granted						(4,981,732)

Cancelled/Forfeited						2,062,177
Expired						(1,196,565)
Balances at September 30, 2022						28,415,124

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, 2021	8,367,664	$	20.52
Granted	4,945,001	19.69
Vested	(2,328,713)	17.59
Forfeited	(900,629)	21.76
Unvested Balance at September 30, 2022	10,083,323	19.99