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Share based Compensation (Tables)

12 Months Ended

Dec. 31, 2022

Share-Based Payment Arrangement [Abstract]

Schedule of Fair Value of Options

The fair value of the stock options granted was estimated on the date of grant using a Black-Scholes option pricing model with the following weighted-average assumptions:

						Years Ended December 31,
						2022						2021						2020
Expected stock price volatility						62.1		%				65.4		%				75.1		%
Risk free interest rate						1.7		%				0.6		%				1.6		%
Expected life of options (years)						5.34						5.40						5.67
Expected annual dividend per share						$	—					$	—					$	—

Schedule of Stock Options Activity

A summary of the Company's stock options for the year ended December 31, 2022 were as follows:

			Number of Shares						Weighted Average Exercise Price						Weighted Average Remaining Years						Aggregate Intrinsic Value
			(in thousands)																		(in millions)
Options outstanding, December 31, 2019			16,724						$	9.15
Granted			4,362						$	9.98
Exercised			(5,243)						$	8.11
Forfeited			(1,376)						$	10.42
Expired			(435)						$	13.33
Options outstanding, December 31, 2020			14,032						$	9.54
Granted			3,262						$	16.53
Exercised			(1,483)						$	7.05
Forfeited			(844)						$	12.97
Expired			(236)						$	13.28
Options outstanding, December 31, 2021			14,731						$	11.08
Granted			5,733						$	11.53
Exercised			(660)						$	6.58
Forfeited			(495)						$	12.57
Expired			(245)						$	12.84
Options outstanding, December 31, 2022			19,064						$	11.31					6.6						$	36.7
Vested and unvested expected to vest, December 31, 2022			17,492						$	11.22					6.4						$	35.1
Exercisable at December 31, 2022			10,938						$	10.59					5.0						$	29.0

Schedule of Non-Vested RSU Activity under the Plan

A summary of non-vested RSU activity under the Plan for the year ended December 31, 2022 is as follows:

			Number of Shares						Weighted Average Grant Date Fair Value						Weighted Average Remaining Years						Aggregate Intrinsic Value
			(in thousands)																		(in millions)
Non-vested units as of December 31, 2019			5,792						$	11.18
Granted			4,692						$	11.29
Vested			(2,164)						$	10.70
Forfeited			(1,240)						$	11.14
Non-vested units as of December 31, 2020			7,080						$	11.35
Granted			3,191						$	16.94
Vested			(1,863)						$	15.77
Forfeited			(1,067)						$	12.82
Non-vested units as of December 31, 2021			7,341						$	13.90
Granted			5,048						$	11.93
Vested			(2,251)						$	12.48
Forfeited			(421)						$	12.06
Non-vested units as of December 31, 2022			9,717						$	13.07					2.1						$	118.6

Schedule of Equity Compensation Expenses

The following table summarizes information related to compensation expense recognized in the Consolidated Statements of Operations related to the equity awards:

						Years Ended December 31,
(in thousands)						2022						2021						2020
Research and development expense						$	25,089					$	17,340					$	20,817
Selling, general, and administrative expense						51,423						40,498						28,334
Total equity compensation expense						$	76,512					$	57,838					$	49,151

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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