Employee Share-Based Compensation Plans - Additional Information (Detail) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2016 USD ($) CompensationPlan $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2014 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	45,000	304,000
Estimated forfeiture rate	22.50%
Weighted average grant date fair value of options granted \| $ / shares	$ 2.38	$ 2.50	$ 2.53
Intrinsic value of stock options exercised \| $	$ 3,100	$ 1,000	$ 1,200
Common stock, par value \| $ / shares	$ 0.01	$ 0.01
Stock-based compensation expense under share based plans \| $	$ 1,286	$ 1,593	1,512
Total fair value of stock awards vested \| $	$ 545	$ 422	$ 797
Employee stock purchase plan, percentage of purchase price	85.00%
Unrecognized compensation expense \| $	$ 743
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		$ 7.00
Common stock, par value \| $ / shares	$ 0.01
Issuance of restricted stock awards, shares	75,000
Restricted share awards issued to employees	0	91,000	84,800
Purchase price of restricted share awards issued to employees \| $ / shares	$ 0.01	$ 0.01	$ 0.01
Stock-based compensation expense under share based plans \| $	$ 420	$ 557	$ 386
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	80,293
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	51,702
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	28,197
Stock option plan, effective date	Jun. 06, 2012
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share issued	132,849	117,431	103,401
Weighted-average fair value of the shares issued under the ESPP Plans \| $ / shares	$ 1.73	$ 1.54	$ 1.75

Employee stock purchase plan purchase price percentage.

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Number of shares subject to repurchase by company under agreement.

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- Definition

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

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- Definition

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

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- Definition

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

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- Definition

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

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- Definition

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

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

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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
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-SubTopic 10
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- Definition

Face amount or stated value per share of common stock.

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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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.

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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
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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.

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- Definition

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

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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.

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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).

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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.

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

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

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No definition available.

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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.

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- Definition

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

+ References

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