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Stockholders' Equity And Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2022

Stockholders’ Equity And Stock-Based Compensation [Abstract]

Stock Option Activity

		Number of Options			Weighted Average Exercise Price		Weighted Average Remaining Contractual Term in Years		Aggregate Intrinsic Value in Millions
Outstanding as of December 31, 2021		2,663,727		$	11.56				$
Options granted		104,000			36.50
Options exercised		(203,640)			15.56
Options forfeited/canceled		(34,639)			20.59
Outstanding as of December 31, 2022		2,529,448			12.13		3.94		$	49.6
Vested and expected to vest at December 31, 2022		2,529,448			12.13		3.94		$	49.6
Exercisable at December 31, 2022		2,270,464		$	10.02		3.43		$	46.9

Information About Stock Options Outstanding

						Options outstanding							Options exercisable
								Weighted
								average		Weighted					Weighted
						Number of		remaining		average			Number of		average
Range of exercise prices						outstanding		contractual		exercise			vested		exercise
From			To			options		life (in years)		price			options		price
$	0.95		$	1.88		585,833		5.6		$	1.51		505,833		$	1.46
$	3.24		$	3.24		550,000		3.0		$	3.24		550,000		$	3.24
$	4.09		$	12.04		536,951		4.1		$	7.09		512,888		$	7.07
$	12.39		$	35.00		655,874		1.6		$	20.82		653,290		$	20.79
$	36.40		$	77.00		200,790		8.8		$	52.64		48,453		$	62.61
						2,529,448		3.9		$	12.13		2,270,464		$	10.02

Weighted Average Fair Value Of Options Granted

	2022		2021		2020
Volatility	151% to 154%		147% to 151%		123% to 139%
Risk-free interest rates	1.98% to 3.69%		1.12% to 1.42%		0.46% to 0.78%
Expected life of option	7.0 years		7.0 years		7 years
Dividend yield	zero		zero		zero
Forfeiture rate	zero		zero		zero
Weighted average fair value of stock options granted	$35.16		$65.83		$6.69

Summary Of Performance Award Activity

		Number of Performance Awards
Outstanding as of December 31, 2021		138,055
Granted		—
Vested		—
Forfeited/canceled		(130,913)
Outstanding as of December 31, 2022		7,142

Stock-Based Compensation Expense

	Years ended December 31,
	2022			2021			2020
Research and development	$	1,631		$	1,302		$	453
General and administrative		435			457			535
Total stock-based compensation expense	$	2,066		$	1,759		$	988

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