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

6 Months Ended

Jun. 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 June 30,				Six Months Ended June 30,
	2022		2021		2022		2021

Cost of revenue	$	4,767	$	3,804	$	8,627	$	6,803
Research and development	13,213		5,291		20,295		10,199
Sales and marketing	4,805		4,010		9,580		8,095
General and administrative	9,814		6,028		20,405		11,246
	$	32,599	$	19,133	$	58,907	$	36,343

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	(243,062)	5.33
Forfeited	(29,134)	8.27
Expired	(226,635)	30.41
Balances at June 30, 2022	10,238,464	21.44		4.7	32,857
Vested and expected to vest at June 30, 2022	10,206,941	21.49		4.7	32,567
Exercisable at June 30, 2022	9,093,852	$	22.86	4.4	24,841

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


						Plan Shares Available for Grant
Balances at December 31, 2021						24,146,784
Added to plan						8,384,460
Granted						(4,507,452)

Cancelled/Forfeited						602,506
Expired						(211,521)
Balances at June 30, 2022						28,414,777

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	4,440,721	19.12
Vested	(1,789,639)	17.53
Forfeited	(427,022)	22.70
Unvested Balance at June 30, 2022	10,591,724	19.70