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Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2021

Share-based Payment Arrangement [Abstract]

Stock-based compensation expense

Total compensation expense by award type and line item in our consolidated financial statements was as follows (in thousands):

			For the Year Ended December 31,
			2021						2020						2019
Award Type
Stock options			$	1,337					$	2,927					$	4,237
Performance-based stock options			—						75						448
RSUs			9,606						7,763						8,877
Performance-based RSUs			2,471						—						(388)
LSUs			3,297						3,841						2,444
Total compensation expense by award type			$	16,711					$	14,606					$	15,618
Line Item
Cost of revenue			$	2,263					$	1,811					$	2,673
Selling, general and administrative expenses			14,448						12,795						12,945
Total compensation expense by financial statement line item			$	16,711					$	14,606					$	15,618

Schedule of unrecognized compensation expense

Total unrecognized compensation expense (in thousands) and expected weighted-average period (in years) by award type for all of our stock-based incentive plans were as follows:

			As of December 31, 2021
			Unrecognized Compensation Expense						Weighted Average Period (years)
Stock options			$	512					0.57
RSUs			26,104						1.69
LSUs			2,422						1.19
Performance-based RSUs			$	4,121					3.17
Total			$	33,159

Option price assumptions

The option price assumptions used for our stock option awards for the year ended December 31, 2019, were as follows:

Weighted-average fair value per option granted			$	6.52
Assumptions:
Expected term (in years)			6.25
Expected volatility			51.6		%
Risk-free interest rate			1.9% - 2.7%
Dividend yield			—		%

The price assumptions used for our leveraged stock unit awards were as follows:

			For the Year Ended December 31,
			2020						2019
Weighted-average fair value per leveraged stock unit granted			$	8.90					$	6.52
Assumptions:
Expected term			10 years						10 years
Expected volatility			62.1		%				51.7		%
Risk-free interest rate			0.85%						2.54%
Dividend yield			—		%				—		%

Stock option information

Information with respect to our stock options (in thousands), including weighted-average remaining contractual term (in years) and aggregate intrinsic value (in thousands) was as follows:

			Options						Weighted Average Exercise Price						Weighted Average Remaining Contractual Term						Aggregate Intrinsic Value
Outstanding as of December 31, 2020			4,070						$	9.32					5.25						$	12,578
Exercised			(1,490)						8.92
Forfeited			(31)						15.23
Outstanding as of December 31, 2021			2,549						$	9.49					3.99						$	46,342
Vested and expected to vest after December 31, 2021			2,549						$	9.49					3.99						$	46,342
Exercisable as of December 31, 2021			2,301						$	9.11					3.71						$	42,717

Performance-based stock option awards activity

Information with respect to our performance-based stock options (shares and aggregate intrinsic value shown in thousands, weighted-average remaining contractual term shown in years) was as follows:

			Options						Weighted Average Exercise Price						Weighted Average Remaining Contractual Term						Aggregate Intrinsic Value
Outstanding as of December 31, 2020			268						$	10.27					6.17						$	(326)
Outstanding as of December 31, 2021			268						10.27						4.16						5,620
Vested and expected to vest after December 31, 2021			268						$	10.27					4.16						$	5,620

Restricted stock units information

Information with respect to our RSUs (not including performance-based RSUs) is presented below (in thousands, except for weighted-average grant-date fair value):

			Total RSUs						Weighted Average Grant Date Fair Value
Outstanding as of December 31, 2020			1,737						$	10.13
Granted			1,276						21.10
Forfeited			(243)						12.74
Vested			(683)						10.68
Outstanding as of December 31, 2021			2,087						$	16.35

Leveraged stock units activity

Information with respect to our leveraged stock unit awards (shares and aggregate intrinsic value shown in thousands, weighted-average remaining contractual term shown in years) was as follows:

			Leveraged Stock Units						Weighted Average Grant Date Fair Value						Weighted Average Remaining Contractual Term						Aggregate Intrinsic Value
Outstanding as of December 31, 2021			1,084						$	11.07					7.68						$	17,993
Vested and expected to vest after December 31, 2021			1,084						$	11.07					7.68						$	17,993

Schedule of price assumptions for performance based stock units

The price assumptions used for our performance based stock unit awards were as follows:

			1st Tranche						2nd Tranche
Weighted-average fair value per performance based stock unit granted			$	20.64					$	20.69
Assumptions:
Expected term			2 years						3 years
Expected volatility			89.5		%				77.7		%
Risk-free interest rate			0.12		%				0.25		%
Dividend yield			—		%				—		%

Schedule of information of performance based stock units

Information with respect to our performance based restricted stock unit awards (shares and aggregate intrinsic value shown in thousands, weighted-average remaining contractual term shown in years) was as follows:

			Performance Based Stock Units						Weighted Average Grant Date Fair Value						Weighted Average Remaining Contractual Term						Aggregate Intrinsic Value
Outstanding as of December 31, 2021			319						$	20.67					9.16						$	2,233
Vested and expected to vest after December 31, 2021			319						$	20.67					9.16						$	2,233

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