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Share based Compensation (Tables)

12 Months Ended

Dec. 31, 2021

Share-based Payment Arrangement [Abstract]

Schedule of Fair Value of Options

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

						Years Ended December 31,
						2021						2020						2019
Expected stock price volatility						65.4		%				75.1		%				74.1		%
Risk free interest rate						0.6		%				1.6		%				2.4		%
Expected life of options (years)						5.40						5.67						5.68
Expected annual dividend per share						$	0.00					$	0.00					$	0.00

Schedule of Stock Options Activity

A summary of the Company's stock options for the year ended December 31, 2021 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, 2018			15,810						$	8.63
Granted			4,091						$	10.29
Exercised			(1,967)						$	5.83
Forfeited			(879)						$	11.07
Expired			(331)						$	13.38
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					6.4						$	30.3
Vested and unvested expected to vest, December 31, 2021			13,432						$	10.89					6.2						$	28.8
Exercisable at December 31, 2021			9,141						$	9.58					5.1						$	24.5

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, 2021 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, 2018			3,712						$	10.59
Granted			3,526						$	10.92
Vested			(921)						$	8.49
Forfeited			(525)						$	10.52
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					2.3						$	84.8

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)						2021						2020						2019
Research and development expense						$	17,340					$	20,817					$	17,575
Selling, general, and administrative expense						40,498						28,334						26,855
Total equity compensation expense						$	57,838					$	49,151					$	44,430

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