Employee stock purchase plan purchase price percentage.

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- Definition

Number of shares subject to repurchase by company under agreement.

+ References

No definition available.

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- Definition

Share based compensation arrangement by share based payment award effective date.

+ References

No definition available.

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- Definition

Share based compensation arrangement by share based payment award equity instruments other than option issued weighted average exercise price.

+ References

No definition available.

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- Definition

Share based compensation arrangement by share based payment award equity instruments other than options issued in period.

+ References

No definition available.

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- Definition

Share based compensation arrangement by share based payment award fair value assumptions expected forfeiture rate.

+ References

No definition available.

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- Definition

Share-based compensation arrangement by share-based payment award number of compensation plans.

+ References

No definition available.

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- Definition

Share based compensation arrangement by share based payment award shares issued in period weighted average fair value.

+ References

No definition available.

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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=27013229&loc=d3e301413-122809

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Face amount or stated value per share of common stock.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Unrecognized cost of unvested options awarded to employees as compensation.

+ References

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(2)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Date the equity-based award expires, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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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

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=96867065&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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(2)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

Maximum number of shares that may be issued in accordance with the plan as a proportion of outstanding capital stock.

+ References

No definition available.

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- Definition

Number of share instruments newly issued under a share-based compensation plan.

+ References

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Employee Share-Based Compensation Plans - Additional Information (Detail) $ / shares in Units, $ in Thousands		12 Months Ended
	Dec. 31, 2016 USD ($) $ / shares	Dec. 31, 2017 USD ($) CompensationPlan $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of share-based compensation plans \| CompensationPlan		5
Shares under options, Granted		177,000	45,000
Estimated forfeiture rate		22.50%
Weighted average grant date fair value of options granted \| $ / shares		$ 2.55	$ 2.38	$ 2.50
Intrinsic value of stock options exercised \| $		$ 3,800	$ 3,100	$ 1,000
Common stock, par value \| $ / shares	$ 0.01	$ 0.01	$ 0.01
Stock-based compensation expense under share based plans \| $		$ 1,022	$ 1,286	1,593
Total fair value of stock awards vested \| $		$ 344	694	422
Employee stock purchase plan, percentage of purchase price		85.00%
Unrecognized compensation expense \| $	$ 339		339
Expected weighted average recognition period for unrecognized compensation expense	9 months 18 days
Option Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period for shares of restricted stock vested		4 years
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period for shares of restricted stock vested		5 years
Weighted average grant date fair value of options granted \| $ / shares		$ 6.98
Common stock, par value \| $ / shares		$ 0.01
Issuance of restricted stock awards, shares		17,000
Restricted share awards issued to employees		14
Purchase price of restricted share awards issued to employees \| $ / shares		$ 0.01
Stock-based compensation expense under share based plans \| $		$ 295	$ 420	$ 557
Minimum [Member] \| Option Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period for shares of restricted stock vested		3 years
Maximum [Member] \| Option Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period for shares of restricted stock vested		5 years
1996 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding shares of common stock		15.00%
Stock option grants		650,000
Shares available for future grant		0
Stock option plan, expiration date		Jun. 30, 2006
2000 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option grants		4,000,000
Shares available for future grant		271,593
2003 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option grants		500,000
Shares available for future grant		0
Stock option plan, expiration date		May 22, 2013
2008 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option grants		1,700,000
Shares available for future grant		4,702
Share issued		1,500,000
Stock option plan, effective date		Jun. 11, 2008
2012 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option grants		1,100,000
Shares available for future grant		60,540
Stock option plan, effective date		Jun. 06, 2012
2017 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option grants		1,500,000
Shares available for future grant		1,500,000
Stock option plan, effective date		Jun. 14, 2017
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share issued		144,349	135,849	114,431
Weighted-average fair value of the shares issued under the ESPP Plans \| $ / shares		$ 1.55	$ 1.73	$ 1.54