Stockholders' Equity (Details Textual) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock-Based Compensation (Textual) [Abstract]
Stock options, Outstanding, Aggregate Intrinsic Value	$ 1,814
Stock options, Exercisable, Aggregate Intrinsic Value	761
Stock options, Exercisable, Number of Options (in shares)	489,674
Stock options, Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 11.87
Stock options, Exercisable, Weighted Average Remaining Contractual Life	1 year 9 months 3 days
Stock options, Outstanding, Weighted Average Remaining Contractual Life	2 years 8 months 19 days
Stock options
Stock-Based Compensation (Textual) [Abstract]
Stock award, vesting period	4 years
Stock award, exercise period	5 years
Awards other than options, decrease in number of shares reserved for issuance	2
Common stock, shares reserved for issuance	9,415,000
Options and award to purchase shares of common stock, issued or expired (in shares)	7,392,732
Number of shares available for future grants	2,022,268
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	0.00%	0.00%	0.00%
Weighted-average fair value per share, options granted (in dollars per share)	$ 4.71	$ 5.45	$ 4.97
Stock options, total intrinsic value of options exercised	232	933	173
Stock options, Outstanding, Aggregate Intrinsic Value		1,958	112
Stock options, Exercisable, Aggregate Intrinsic Value		619	85
Stock options, Exercisable, Number of Options (in shares)		349,449,000	290,911
Stock options, Exercisable, Weighted Average Exercise Price (in dollars per share)		$ 11.90	$ 10.52
Stock options, Exercisable, Weighted Average Remaining Contractual Life		2 years 2 months 15 days	1 year 9 months 11 days
Stock options, Outstanding, Weighted Average Remaining Contractual Life		2 years 9 months 29 days	3 years 3 months 11 days
Unrecognized compensation expense	2,492
Weighted-average period of recognition (in years)	2 years 3 months 29 days
Allocated Share-based Compensation Expense	1,368	1,438	1,130
Cash received under stock option plans for exercises	471	1,344	689
Restricted stock
Stock-Based Compensation (Textual) [Abstract]
Unrecognized compensation expense	4,034
Weighted-average period of recognition (in years)	2 years 5 months 15 days
Allocated Share-based Compensation Expense	2,317	2,613	2,495
Granted (in shares)	265,380	265,625	43,340
Restricted stock, Granted, Weighted-average grant date fair value (in dollars per share)	$ 13.57	$ 13.61	$ 12.53
Employee stock purchase plan
Stock-Based Compensation (Textual) [Abstract]
Number of shares available for future grants	46,575
Allocated Share-based Compensation Expense	55	73	54
Employee stock purchase plan, number of shares authorized	650,000
Percentage of Company's common stock share price	85.00%
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period	12,398	27,027	27,308
Employee stock purchase plan, discount percentage attributable to compensation expense	15.00%
Cash received under the employee stock purchase plan	$ 138	$ 308	$ 270
Employee stock purchase plan \| Maximum
Stock-Based Compensation (Textual) [Abstract]
Employee election percentage of pre-tax compensation withheld to purchase Company's common stock shares	6.00%

Share-Based Compensation Arrangement By Share Based Payment Award, Award Exercise Period

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Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Awards, Pre-Tax Contibution Percentage Of Compensation

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Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option Equity Instrument, Discount Percentage Attributable to Compensation Expense

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Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option Equity Instrument, Percentage Of Share Price

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Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Reduction Of Number of Shares Reserved For Issuance

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Share-Based Compensation Arrangement by Share-Based Payment Award, Options and Non-Option Equity Instruments, Shares Issued Or Expired

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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.

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Aggregate number of common shares reserved for future issuance.

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Unrecognized cost of unvested share-based compensation awards.

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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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The cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards other than stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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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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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).

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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).

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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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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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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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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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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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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