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Share-based Compensation (Tables)

6 Months Ended

Jun. 30, 2021

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Stock Option Activity

The following table summarizes the Company’s stock option activity (in thousands, except per share data and years) for the three months ended June 30, 2021:

		Stock Options Outstanding
						Weighted Average				Aggregate				Weighted Average
						Exercise Price				Intrinsic				Remaining Contractual
		Shares				Per Share				Value				Term (Years)
Balance as of April 1, 2021			1,273			$	259.39
Granted			20			$	470.00
Exercised			(2	)		$	129.90			$	643
Forfeited/Expired			(11	)		$	504.66
Balance as of June 30, 2021			1,280			$	260.71
Exercisable as of June 30, 2021			587			$	132.35			$	312,395				3.8
Expected to vest as of June 30, 2021			693			$	369.48			$	211,992				8.9
Total			1,280			$	260.71			$	524,387				6.5

Schedule of Range of Exercise Prices per Share

Stock options outstanding as of June 30, 2021 are comprised of the following range of exercise prices per share (in thousands, except per share data and years):

		Stock Options Outstanding at June 30, 2021
						Weighted Average				Weighted Average
						Exercise Price				Remaining Contractual
Range of Exercise Prices per Share		Shares				Per Share				Term (Years)
$121.43 - $200.00			988			$	137.78				5.6
$400.01 - $500.00			20			$	470.00				9.9
$600.01 - $700.00			269			$	691.23				9.7
$700.01 - $756.55			3			$	756.55				9.7
Total			1,280			$	260.71				6.5

Assumptions Used in Black-Scholes Pricing Model

The weighted average grant date fair value of stock option awards using the Black-Scholes pricing model was $252.81 and $42.50 for each share subject to a stock option granted during the three months ended June 30, 2021 and 2020, respectively, based on the following assumptions:

		Three months ended
		June 30,
		2021			2020
Expected term of options in years		6.3				6.3
Expected volatility			56.8	%			34.4	%
Risk-free interest rate			1.1	%			0.4	%
Expected dividend yield			0.0	%			0.0	%

Summary of Restricted Stock Unit Activity

As of June 30, 2021, there were 86,150 restricted stock units outstanding under the 2013 Equity Plan, which the Company intends to settle in shares.  The following table summarizes the Company’s restricted stock unit activity (in thousands) for the periods indicated:

		Restricted Stock Units Outstanding
						Aggregate
						Intrinsic
		Units				Value
Balance as of April 1, 2021			90
Granted			1
Vested			0			$	0
Forfeited			(5	)
Balance as of June 30, 2021			86
Expected to vest as of June 30, 2021			86			$	57,247

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Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

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Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms.

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