XML 56 R37.htm IDEA: XBRL DOCUMENT v3.20.4

Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2020

Stock-Based Compensation Expense Related to Stock Options, PSUs, RSUs and Restricted Stock

The following table summarizes stock-based compensation expense related to stock options, PSUs, RSUs and restricted stock for the years ended December 31, 2020, 2019 and 2018:

(In thousands)		2020				2019				2018
Stock-based compensation expense included in cost of sales		$	426			$	369			$	418
Selling, general and administrative expenses			4,036				3,889				3,989
Research and development expenses			2,372				2,704				2,748
Stock-based compensation expense included in operating expenses			6,408				6,593				6,737
Total stock-based compensation expense			6,834				6,962				7,155
Tax benefit for expense associated with non-qualified stock options, PSUs, RSUs and restricted stock			(1,629	)			(1,659	)			(1,432	)
Total stock-based compensation expense, net of tax		$	5,205			$	5,303			$	5,723

Summary of PSUs, RSUs and Restricted Stock Outstanding

The following table is a summary of our PSUs, RSUs and restricted stock outstanding as of December 31, 2019 and 2020 and the changes that occurred during 2020:

		Number of shares (In thousands)				Weighted Average Grant Date Fair Value
Unvested PSUs, RSUs and restricted stock outstanding, December 31, 2019			1,891			$	14.58
PSUs, RSUs and restricted stock granted			1,029			$	11.02
PSUs, RSUs and restricted stock vested			(453	)		$	14.26
PSUs, RSUs and restricted stock forfeited			(621	)		$	18.14
Unvested PSUs, RSUs and restricted stock outstanding, December 31, 2020			1,846			$	11.49

Summary of Stock Options Outstanding

The following table is a summary of stock options outstanding as of December 31, 2020 and 2019 and the changes that occurred during 2020:

		Number of Options (In thousands)				Weighted Average Exercise Price (Per share)				Weighted Avg. Remaining Contractual Life in Years				Aggregate Intrinsic Value (In thousands)
Stock options outstanding, December 31, 2019			3,572			$	22.88				3.40			$	—
Stock options granted			—			$	—
Stock options exercised			—			$	—
Stock options forfeited			—			$	—
Stock options expired			(854	)		$	28.00
Stock options outstanding, December 31, 2020			2,718			$	21.17				2.86			$	—
Stock options exercisable, December 31, 2020			2,718			$	21.17				2.86			$	—

Stock Options Outstanding

The following table further describes our stock options outstanding as of December 31, 2020:

		Options Outstanding												Options Exercisable
Range of Exercise Prices		Options Outstanding at December 31, 2020 (In thousands)				Weighted Avg. Remaining Contractual Life in Years				Weighted Average Exercise Price				Options Exercisable at December 31, 2020 (In thousands)				Weighted Average Exercise Price
$15.33 – $18.96			1,007				3.69			$	15.91				1,007			$	15.91
$18.97 – $23.45			588				3.68			$	18.97				588			$	18.97
$23.46 – $30.35			603				2.55			$	24.11				603			$	24.11
$30.36 – $41.92			520				0.64			$	30.40				520			$	30.40
			2,718												2,718

Market-Based PSUs [Member]

Summary of Weighted-Average Assumptions and Value of Options Granted

The following table details the significant assumptions that impact the fair value estimate of the market-based PSUs:

		2020				2019		2018
Estimated fair value per share			$14.43			$9.53 to $18.05			$16.59
Expected volatility			51.88%			32.7% to 38.9%		27.98% to 31.58%
Risk-free interest rate			0.24%			1.6% to 2.46%		2.11% to 2.99%
Expected dividend yield			2.85%			2.3% to 4.09%		1.83% to 2.49%

X

- Definition

Schedule of share based compensation performance stock units restricted stock units and restricted stock activity.

+ References

No definition available.

+ Details

Name:	adtn_ScheduleOfShareBasedCompensationPerformanceStockUnitsRestrictedStockUnitsAndRestrictedStockActivityTableTextBlock
Namespace Prefix:	adtn_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

+ 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 (h)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901

+ Details

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

X

- Definition

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.

+ 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
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

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

X

- Definition

Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

+ 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 (d)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

Name:	us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock
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

- Details

Name:	us-gaap_AwardTypeAxis=adtn_MarketBasedPerformanceStockUnitsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: