XML 47 R31.htm IDEA: XBRL DOCUMENT v3.20.4

Share-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2020

Share-based Payment Arrangement [Abstract]

Summary of shares available for grant

The following table summarizes the shares available for grant under the 2018 Plan:

			Shares Available for Grant
Balance - December 31, 2019			3,297,638
Authorized			2,144,521
Granted			(512,945)
Shares withheld to cover taxes			16,742
Forfeited			75,314
Balance - December 31, 2020			5,021,270

Schedule of fair value assumptions

Following are the assumptions used in the Black-Scholes valuation model for options granted during the periods shown below:

			Year Ended December 31,
			2020						2019						2018
Risk-free interest rate			1.3%						2.3%						2.8%
Average expected term (years)			7.0						6.1						5.8
Expected volatility			55.0%						55.0%						55.0%
Dividend yield			—						—						—

Schedule of stock option activity

The following table summarizes the Company’s stock option activity during the period from December 31, 2017 through December 31, 2020:

			Number of Stock Options						Weighted Average Exercise Price						Weighted Average Remaining Contractual Life (Years)						Aggregate Intrinsic Value (in thousands)(1)
Outstanding at December 31, 2017			4,207,029						$	0.88					7.2						$	8,936
Granted			2,136,012						$	6.49					—						$	—
Exercised			(1,139,962)						$	1.20					—						$	5,722
Cancelled/Forfeited			(82,786)						$	2.03					—						$	—
Outstanding at December 31, 2018			5,120,293						$	3.13					7.3						$	81,371
Granted			1,571,925						$	39.01					—						$	—
Exercised			(1,429,756)						$	1.87					—						$	121,591
Cancelled/Forfeited			(91,486)						$	9.33					—						$	—
Outstanding at December 31, 2019			5,170,976						$	14.28					7.5						$	329,879
Granted			268,193						$	99.74					—						$	—
Exercised			(1,163,374)						$	7.75					—						$	132,935
Cancelled/Forfeited			(57,517)						$	37.14					—						$	—
Outstanding at December 31, 2020			4,218,278						$	21.20					6.6						$	443,595
Vested and exercisable at December 31, 2020			2,634,631						$	9.74					5.7						$	305,890
Vested and expected to vest at December 31, 2020			3,869,597						$	18.26					6.5						$	417,857

__________

(1) Aggregate intrinsic value is calculated as the difference between the value of common stock on the transaction date and the exercise price multiplied by the number of shares issuable under the stock option. Aggregate intrinsic value of shares outstanding at the beginning and end of the reporting period is calculated as the difference between the value of common stock on the beginning and end dates, respectively, and the exercise price multiplied by the number of shares outstanding.

Schedule of RSU activity

The following table summarizes the Company’s RSU activity from January 1, 2019 through December 31, 2020:

						Number of Units						Weighted Average Grant Date Fair Value Per Unit
Unvested at January 1, 2019						—						$	—
Granted						173,196						$	126.29
Vested						(23,552)						$	84.84
Cancelled/Forfeited						(640)						$	—
Unvested at December 31, 2019						149,004						$	132.73
Granted						244,752						$	109.61
Vested						(99,970)						$	127.71
Cancelled/Forfeited						(17,797)						$	—
Unvested at December 31, 2020						275,989						$	114.99

Schedule of restricted stock activity

The following table summarizes the Company’s restricted stock activity:

			Number of Shares of Restricted Stock						Weighted Average Remaining Contractual Life (Years)						Weighted Average Grant Date Fair Value Per Share
Unvested at December 31, 2017			—						—						$	—
Granted			135,791						—						$	17.03
Vested/Released			(35,664)						—						$	17.03
Cancelled/Forfeited			—						—						$	—
Unvested at December 31, 2018			100,127						1.6						$	17.03
Granted			99,433						—						$	20.02
Vested/Released			(87,239)						—						$	19.21
Cancelled/Forfeited			(23,333)						—						$	—
Unvested at December 31, 2019			88,988						1.2						$	19.49
Granted			—						—						$	—
Vested/Released			(76,804)						—						$	19.97
Cancelled/Forfeited			—						—						$	—
Unvested at December 31, 2020			12,184						0.3						$	20.02

X

- References

No definition available.

+ Details

Name:	us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

Name:	us-gaap_DisclosureOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of the changes in outstanding nonvested restricted stock shares.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

Name:	us-gaap_NonvestedRestrictedStockSharesActivityTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

Name:	us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

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

+ References

No definition available.

+ Details

Name:	us-gaap_ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of number, weighted-average exercise price or conversion ratio, aggregate intrinsic value, and weighted-average remaining contractual term for outstanding and exercisable options that are fully vested and expected to vest. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAndExercisableTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration