Employee Stock Purchase Plan, Discount from Market Price

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- Definition

Employee Stock Purchase Plan Expense

+ References

No definition available.

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- Definition

Total amount that may be granted under the ESPP.

+ References

No definition available.

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- Definition

Employee stock purchase plan number of shares available for grant.

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No definition available.

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- Definition

Employee Stock Purchase Plan Offer Period

+ References

No definition available.

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Employees Offering Dates Intervals

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No definition available.

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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

+ References

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- Definition

Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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- Definition

The cash inflow associated with the amount received from the stock plan during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

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- Definition

Rate of weighted-average expected volatility for award under share-based payment arrangement.

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- Definition

Number of shares authorized for issuance under share-based payment arrangement.

+ References

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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- Definition

Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Shareholders' Equity - Additional Information (Detail) - USD ($)		12 Months Ended
	Jul. 06, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	May 16, 2017
Class of Stock [Line Items]
Number of stock option granted		1,215,000
Share-based compensation expense		$ 1,800,000	$ 2,700,000	$ 3,100,000
Tax benefit related to stock based compensation expense		$ 300,000	400,000	500,000
Discount from market price		15.00%
Employees offering dates intervals		6 months
Number of shares authorized in employee stock purchase plan		1.3
Employee stock purchase plan period		10 years
Employee stock purchase plan number of shares remain available for future issuance		1,300,000
Employee stock purchase plan expense		$ 20,000	60,000	90,000
Estimated weighted-average fair value of stock options granted		$ 1.98
Expected volatility rate		52.50%
Expected term period		5 years
Risk-free interest rate		0.30%
Cash received from employee stock option exercised		$ 0	7,000	100,000
Intrinsic value of option exercised		$ 0	$ 300,000	$ 24,000,000,000
Chief Executive Officer [Member]
Class of Stock [Line Items]
2017 stock options or stock awards, vesting period	4 years
Number of stock awards granted	1.2
Fair value of stock awards granted	$ 2.4
2017 Plan [Member]
Class of Stock [Line Items]
Shares available for future grant		1,100,000
2017 Plan [Member] \| Common Stock [Member]
Class of Stock [Line Items]
Number of shares reserved for issuance					1,900,000
2017 Plan [Member] \| Minimum [Member]
Class of Stock [Line Items]
2017 stock options or stock awards, vesting period		3 years
2017 Plan [Member] \| Maximum [Member]
Class of Stock [Line Items]
2017 stock options or stock awards, vesting period		4 years
2007 Plan [Member]
Class of Stock [Line Items]
Number of stock option granted		0
Employee Stock Option [Member] \| 2017 Plan [Member]
Class of Stock [Line Items]
2017 stock options or stock awards, vesting period		4 years
Restricted Stock Units [Member] \| Chief Executive Officer [Member]
Class of Stock [Line Items]
2017 stock options or stock awards, vesting period	4 years
Number of stock awards granted	94,000
Fair value of stock awards granted	$ 0.6
Restricted Stock and Performance Units [Member]
Class of Stock [Line Items]
Unrecognized compensation expense related to stock options and restricted stock		$ 6,000,000.0
Weighted average vesting period		2 years 8 months 12 days