Share-Based Payments

6 Months Ended

Jun. 30, 2023

Share-Based Payment Arrangement [Abstract]

Share-Based Payments

Share-Based PaymentsShare-based compensation expense is as follows (dollars in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2023		2022		2023		2022
	(unaudited)				(unaudited)
Research and development	$	1,246	$	808	$	2,204	$	1,459
Selling, general and administrative	4,842		3,489		10,190		6,863
Total	$	6,088	$	4,297	$	12,394	$	8,322

Stock Option and Stock Appreciation Rights

The following table summarizes stock option and stock appreciation rights (SAR) activities:

	Number of Options	Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (in years)
Outstanding, December 31, 2022	5,797,569	$	26.99	6.11
Granted	1,112,140	$	38.52
Exercised	(210,528)	$	17.33
Forfeited	(50,262)	$	32.46
Outstanding, June 30, 2023 (unaudited)	6,648,919	$	29.17	6.38
As of June 30, 2023 (unaudited):
Vested and expected to vest	6,648,919	$	29.17	6.38
Exercisable	4,079,988	$	26.42	4.87
As of December 31, 2022:
Vested and expected to vest	5,797,569	$	26.99	6.11
Exercisable	3,541,395	$	25.08	4.68

Restricted Stock Units

The following table summarizes restricted stock unit (RSU) activities:

	Number of RSUs	Weighted Average Grant Date Fair Value per Share
Nonvested, December 31, 2022	131,960	$	32.17
Granted	227,980	$	38.60
Vested	(46,674)	$	32.18
Forfeited	(6,875)	$	33.53
Nonvested, June 30, 2023 (unaudited)	306,391	$	36.92

Performance Share Units

The following table summarizes performance share unit (PSU) activities:

	Performance-Based Units			Market-Based Units			Total PSUs
	Number of PSUs	Weighted Average Grant Date Fair Value per Share		Number of PSUs	Weighted Average Grant Date Fair Value per Share		Number of PSUs	Weighted Average Grant Date Fair Value per Share
Nonvested, December 31, 2022	181,750	$	29.07	20,000	$	28.63	201,750	$	29.03
Granted	205,000	$	34.00	—	$	—	205,000	$	34.00
Vested	(65,020)	$	29.33	—	$	—	(65,020)	$	29.33
Forfeited	(3,000)	$	28.93	—	$	—	(3,000)	$	28.93
Nonvested, June 30, 2023 (unaudited)	318,730	$	32.19	20,000	$	28.63	338,730	$	31.98