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Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2016 | Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
ASC 2016-09 Impact: Amount of deferred tax assets that had not been previously recognized due to the recognition of excess tax benefits | $ 696 | $ 1,231 |  |  |
Stock-Based Compensation (Textual) [Abstract] |  |  |  |  |
Stock options, Outstanding, Aggregate Intrinsic Value | 1,268 | 681 | $ 123 |  |
Stock options, Exercisable, Aggregate Intrinsic Value | $ 9 | $ 382 | $ 122 |  |
Stock options, Exercisable, Number of Options (in shares) | 307 | 379 | 687 |  |
Stock options, Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 12.37 | $ 11.39 | $ 11.60 |  |
Stock options, Exercisable, Weighted Average Remaining Contractual Life | 1 year 4 months 13 days | 1 year 6 months | 2 years |  |
Stock options, Outstanding, Weighted Average Remaining Contractual Life | 3 years 3 months 7 days | 2 years 2 months 23 days | 2 years 14 days |  |
Allocated Share-based Compensation Expense | $ 3,518 | $ 3,651 | $ 3,734 |  |
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 | 0 |  |  |  |
Common stock, shares reserved for issuance | 12,415 |  |  |  |
Number of shares available for future grants | 1,715 |  |  |  |
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) | $ 2.74 | $ 2.77 | $ 4.39 |  |
Stock options, total intrinsic value of options exercised | $ 149 | $ 484 | $ 50 |  |
Unrecognized compensation expense | $ 1,789 |  |  |  |
Weighted-average period of recognition (in years) | 2 years 11 months 26 days |  |  |  |
Allocated Share-based Compensation Expense | $ 707 | 702 | 1,229 |  |
Cash received under stock option plans for exercises | 1,236 | 2,438 | 90 |  |
Restricted stock |  |  |  |  |
Stock-Based Compensation (Textual) [Abstract] |  |  |  |  |
Unrecognized compensation expense | $ 3,863 |  |  |  |
Weighted-average period of recognition (in years) | 2 years 1 month 24 days |  |  |  |
Allocated Share-based Compensation Expense | $ 2,760 | $ 2,938 | $ 2,422 |  |
Granted (in shares) | 271 | 424 | 203 |  |
Restricted stock, Granted, Weighted-average grant date fair value (in dollars per share) | $ 8.83 | $ 8.68 | $ 12.43 |  |
Employee stock purchase plan |  |  |  |  |
Stock-Based Compensation (Textual) [Abstract] |  |  |  |  |
Number of shares available for future grants | 954 |  |  |  |
Allocated Share-based Compensation Expense | $ 50 | $ 11 | $ 58 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period | 46 | 18 | 28 |  |
Employee stock purchase plan, discount percentage attributable to compensation expense | 15.00% |  |  |  |
Cash received under the employee stock purchase plan | $ 358 | $ 146 | $ 291 |  |
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% |  |  |  |
ESPP Plan [Member] | Employee stock purchase plan |  |  |  |  |
Stock-Based Compensation (Textual) [Abstract] |  |  |  |  |
Employee stock purchase plan, number of shares authorized |  |  |  | 1,650 |
Percentage of Company's common stock share price |  |  |  |  | 85.00%
Accounting Standards Update 2016-09 [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
ASC 2016-09 Impact: Amount of deferred tax assets that had not been previously recognized due to the recognition of excess tax benefits | $ 1,571 |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | 1,571 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost | 215 |  |  |  |
Accounting Standards Update 2016-09 [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost | 3,449 |  |  |  |
Operating Expense [Member] | Accounting Standards Update 2016-09 [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | $ 19 |  |  |  |

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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 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 + Details
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- Definition 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. + 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 (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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