Employee stock-based compensation cost recognized in the consolidated statements of income/(loss) and comprehensive income/(loss) was as follows:


	Three Months Ended September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
	(in thousands)
Cost of revenue	$	502	$	367	$	1,482	$	888
Engineering, research, and development	1,005		1,834		3,678		4,336
Sales and marketing	854		1,239		2,732		3,117
General and administrative	4,906		14,111		19,785		34,258
Total stock-based compensation	$	7,267	$	17,551	$	27,677	$	42,599


	Number of Options	Weighted Average Exercise Price		Aggregate Intrinsic Value (in thousands)		Weighted Average Contractual Term (in years)
Options outstanding as of December 31, 2022	1,598,811	$	3.54	$	12,279	6.0
Options exercised	(62,795)	$	3.54
Options outstanding as of September 30, 2023	1,536,016	$	3.54	$	13,271	5.2

Options vested and exercisable as of September 30, 2023	1,529,816	$	3.54	$	13,218	5.2

The total unrecognized compensation expenses related to 2018 Plan options as of September 30, 2023 was $0.8 thousand to be expensed on a straight-line basis over 0.1 years.

As of September 30, 2023, 7.2 million shares were available for grant under 2020 Incentive Stock Plan (“2020 Plan”).


	Number of Options	Weighted Average Exercise Price		Aggregate Intrinsic Value (in thousands)		Weighted Average Contractual Term (in years)
Options outstanding as of December 31, 2022	3,003,611	$	13.22	$	3,883	8.3
Options granted	642,000	$	11.59
Options exercised	(111,869)	$	8.25
Options forfeited	(251,407)	$	15.11
Options expired	(28,841)	$	21.61
Options outstanding as of September 30, 2023	3,253,494	$	12.85	$	4,898	7.8

Options vested and exercisable as of September 30, 2023	1,492,386	$	11.47	$	3,864	6.8

The Company elected the policy to account for forfeitures as these occur. The total unrecognized compensation expenses related to 2020 Stock Plan options as of September 30, 2023 was $10.2 million to be expensed on a straight-line basis over the remaining 2.7 years.

The following table summarizes activity of the Company’s RSUs for the nine months ended September 30, 2023:


	Number of Shares	Weighted Average Grant Date Fair Value
Unvested awards as of December 31, 2022	2,245,968	$	11.99
Awards granted	185,500	$	11.36
Awards vested and released	(1,293,759)	$	12.18
Awards forfeited	(101,883)	$	11.22
Unvested awards as of September 30, 2023	1,035,826	$	11.71

During the nine months ended September 30, 2023 the Company net withheld and returned to the 2020 Plan pool 0.6 million shares to cover $6.9 million tax obligations for RSU releases. The total unrecognized compensation expenses related to 2020 Stock Plan RSUs as of September 30, 2023 was $9.6 million to be expensed on a straight-line basis over 0.9 years.

The following table summarizes activity of the Company's PSUs for the nine months ended September 30, 2023:


	Number of Shares	Weighted Average Grant Date Fair Value
Unvested awards as of December 31, 2022	1,328,482	$	39.41
Awards granted	523,938	$	11.97
Awards vested and released	(1,328,482)	$	39.41
Awards forfeited	(32,375)	$	11.97
Unvested awards as of September 30, 2023	491,563	$	11.97

During first quarter of 2023, the Company withheld 0.7 million shares to cover the $8.1 million tax obligations related to the release of vested 2022 PSU shares certified at 256% performance goal achievement on February 21, 2023. The total estimated