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Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2021

Share-based Payment Arrangement [Abstract]

Schedule of Stock-based Compensation Expense

Stock-based compensation expense was recorded in the following cost and expense categories consistent with the respective employee or service provider’s related cash compensation (in thousands):

			Year ended December 31,
			2021						2020						2019
Cost of revenue
Subscription and support			$	2,868					$	1,709					$	1,554
Professional services			1,729						1,434						1,725
Operating expenses
Research and development			9,590						8,100						8,006
Sales and marketing			13,901						11,062						8,792
General and administrative			20,545						23,466						15,707
Total			$	48,633					$	45,771					$	35,784

Schedule of Stock-Option Activity

The following table summarizes the option activity under the Plans for the year ended December 31, 2021:

			Options						Weighted- Average Exercise Price						Weighted- Average Remaining Contractual Term (Years)						Aggregate Intrinsic Value
																					(in thousands)
Outstanding at December 31, 2020			2,903,167						$	14.48					4.7						$	223,941
Granted			—						—
Forfeited			(6,895)						19.29
Exercised			(1,141,092)						14.55
Outstanding at December 31, 2021			1,755,180						$	14.42					4.0						$	203,720
Exercisable at December 31, 2021			1,755,180						$	14.42					4.0						$	203,720

Summary of Restricted Stock Units

The following table summarizes the restricted stock unit activity under the Plan for the year ended December 31, 2021:

			Number of Shares						Weighted-Average Grant Date Fair Value
Unvested at December 31, 2020			2,904,616						$	35.72
Granted			916,634						109.64
Forfeited			(218,852)						64.36
Vested(1)			(1,710,699)						31.89
Unvested at December 31, 2021			1,891,699						$	73.04

(1) During the year ended December 31, 2021, in accordance with our Nonqualified Deferred Compensation Plan, recipients of 402,832 shares had elected to defer settlement of the vested restricted stock units and 270,567 were released from deferral. This resulted in total deferred units of 695,869 as of December 31, 2021.

Schedule of Share-based Payment Award, ESPP, Valuation Assumptions

The fair value of our ESPP purchase rights was estimated assuming no expected dividends and the following weighted-average assumptions:

			Year ended December 31,
			2021						2020						2019
ESPP
Expected term (in years)			0.5						0.5						0.5
Risk-free interest rate			0.1%						0.2% - 1.5%						1.9% - 2.6%
Expected volatility			41.8% - 45.0%						40.6% - 61.0%						35.0% - 49.0%

Schedule of Employee Stock Purchase Plan

The following table summarizes the ESPP activity under the Plan for the years ended December 31, 2021, 2020 and 2019:

						For the year ended December 31,
						2021						2020						2019
Shares issued						148,864						186,855						188,390
Weighted-average purchase price						$	59.52					$	38.68					$	26.13
Total proceeds (in thousands)						$	8,861					$	7,227					$	4,922

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