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Stockholders' Equity - Additional Information (Details) |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |  |
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Sep. 09, 2015 USD ($) shares | Jan. 09, 2015 USD ($) Executives shares | Jun. 11, 2013 shares | Aug. 31, 2007 USD ($) $ / shares shares | Jan. 02, 2016 USD ($) $ / shares shares | Jan. 03, 2015 USD ($) $ / shares shares | Dec. 28, 2013 USD ($) $ / shares shares | Dec. 31, 2011 USD ($) | Dec. 31, 2015 $ / shares | Aug. 31, 2015 USD ($) | Jul. 31, 2014 USD ($) | Feb. 28, 2013 USD ($) | Feb. 28, 2012 USD ($)
Undesignated Preferred stock authorized |  |  |  |  | 2,000,000 | 2,000,000 |  |  |  |  |  |  |
Preferred stock Par value | $ / shares |  |  |  |  | $ 0.01 | $ 0.01 |  |  |  |  |  |  |
Convertible preferred stock, shares issued |  |  |  |  | 0 | 0 |  |  |  |  |  |  |
Warrants to purchase common stock |  |  |  | 600,000 |  |  |  |  |  |  |  |  |
Exercise price of warrants | $ / shares |  |  |  | $ 0.01 |  |  |  |  |  |  |  |  |
Warrants expiration date |  |  |  | Dec. 31, 2007 |  |  |  |  |  |  |  |  |
Warrants to purchase number of common stock |  |  |  | 1.2 |  |  |  |  |  |  |  |  |
Purchase price of preferred stock and warrants | $ / shares |  |  |  | $ 10.00 |  |  |  |  |  |  |  |  |
Proceeds allocated to common stock warrants | $ |  |  |  | $ 2,300,000 |  |  |  |  |  |  |  |  |
Common stock converted from Series A Preferred Stock, shares |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |
Exercisable period |  |  |  |  | 3 years 6 months 22 days |  |  |  |  |  |  |  |
Repurchase of shares |  |  |  |  | 837,241 |  |  |  |  |  |  |  |
Shares reserved |  |  |  |  | 1,322,274 |  |  |  |  |  |  |  |
Weighted-average grant date fair value of the options granted | $ / shares |  |  |  |  | $ 3.95 | $ 4.02 | $ 3.16 |  |  |  |  |  |
Total intrinsic value of options exercised | $ |  |  |  |  | $ 1,500,000 | $ 1,900,000 | $ 1,500,000 |  |  |  |  |  |
Total unrecognized compensation cost related to non-vested share-based compensation arrangements | $ |  |  |  |  | $ 1,800,000 |  |  |  |  |  |  |  |
Cost is expected to be recognized over a weighted average period |  |  |  |  | 2 years 7 months 13 days |  |  |  |  |  |  |  |
Excess tax benefits from stock-based awards | $ |  |  |  |  | $ 0 | $ 36,000 | $ 0 |  |  |  |  |  |
Restricted stock units granted |  |  |  |  | 227,905 | 62,225 | 234,012 |  |  |  |  |  |
Stock repurchase program authorized amount | $ |  |  |  |  | $ 6,600,000 |  |  |  |  |  | $ 3,000,000 | $ 3,000,000 | $ 4,000,000
Stock repurchase, shares |  |  |  |  | 199,776 |  |  |  |  |  |  |  |
Shares repurchased price, per share | $ / shares |  |  |  |  | $ 7.82 |  |  |  |  |  |  |  |
Remaining common stock value authorized to purchase under stock repurchase program | $ |  |  |  |  | $ 1,100,000 |  |  |  |  |  |  |  |
Stock repurchase program additional amount authorized | $ |  |  |  |  |  |  |  |  |  | $ 2,000,000 |  |  |
Cash paid to former chief financial officer and chief operating officer to cancel agreement of vested stock option | $ | $ 275,000 |  |  |  |  |  |  |  |  |  |  |  |
Number of shares, options canceled |  |  |  |  | 174,870 | 27,957 | 123,679 |  |  |  |  |  |
James H. Mackaness |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares, options canceled | 92,656 |  |  |  |  |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |  |  |  |
Grant of non-qualified stock option | $ |  |  |  |  |  |  |  | $ 20,000 |  |  |  |  |
The intrinsic value of the restricted stock units | $ / shares |  |  |  |  |  |  |  |  | $ 9.29 |  |  |  |
Restricted stock units granted |  |  |  |  | 225,392 | 59,780 | 230,509 |  |  |  |  |  |
Number of Shares, Restricted stock units released |  |  |  |  | 209,193 | 46,759 | 17,249 |  |  |  |  |  |
Restricted stock units released, intrinsic value | $ |  |  |  |  | $ 2,500,000 |  |  |  |  |  |  |  |
Restricted stock units released, Shares withheld |  |  |  |  | 66,882 |  |  |  |  |  |  |  |
Restricted stock units released, value withheld | $ |  |  |  |  | $ 606,000 |  |  |  |  |  |  |  |
1998 Stock Plan |  |  |  |  |  |  |  |  |  |  |  |  |
Voting rights on outstanding capital stock |  |  |  |  | 10.00% |  |  |  |  |  |  |  |
Exercise price of option |  |  |  |  | 110.00% |  |  |  |  |  |  |  |
Term of incentive stock options for major stock holders |  |  |  |  | 5 years |  |  |  |  |  |  |  |
Exercisable period |  |  |  |  | 4 years |  |  |  |  |  |  |  |
Maximum term of incentive stock options granted |  |  |  |  | 10 years |  |  |  |  |  |  |  |
Repurchase of shares |  |  |  |  | 0 | 0 |  |  |  |  |  |  |
Expiration date of option Plan |  |  |  |  | 2008-02 |  |  |  |  |  |  |  |
2008 Equity Incentive Plan |  |  |  |  |  |  |  |  |  |  |  |  |
Grant of non-qualified stock option |  |  |  |  | 300,000 |  |  |  |  |  |  |  |
Retention Award | Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock units granted |  | 56,000 |  |  |  |  |  |  |  |  |  |  |
Number of executives | Executives |  | 6 |  |  |  |  |  |  |  |  |  |  |
Award investing period |  |  |  |  | 4 years |  |  |  |  |  |  |  |
Weighted grant date fair value of restricted stock units granted | $ |  | $ 485,000 |  |  |  |  |  |  |  |  |  |  |
Retention Award | Restricted Stock Units (RSUs) | Vesting on Grant Date |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of retention award vesting |  | 20.00% |  |  |  |  |  |  |  |  |  |  |
Retention Award | Restricted Stock Units (RSUs) | Vesting Annually |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of retention award vesting |  |  |  |  | 80.00% |  |  |  |  |  |  |  |
Performance Award | Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock units granted |  | 110,000 |  |  |  |  |  |  |  |  |  |  |
Number of executives | Executives |  | 6 |  |  |  |  |  |  |  |  |  |  |
Award investing period |  |  |  |  | 4 years |  |  |  |  |  |  |  |
Weighted grant date fair value of restricted stock units granted | $ |  | $ 486,000 |  |  |  |  |  |  |  |  |  |  |
Period consider for calculation of average stock price performance after awards vesting |  |  |  |  | 60 days |  |  |  |  |  |  |  |
Market Performance Award | Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock units granted |  | 50,000 |  |  |  |  |  |  |  |  |  |  |
Award investing period |  |  |  |  | 4 years |  |  |  |  |  |  |  |
Weighted grant date fair value of restricted stock units granted | $ |  | $ 234,000 |  |  |  |  |  |  |  |  |  |  |
Period consider for calculation of average stock price performance after awards vesting |  |  |  |  | 60 days |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock conversion to common stock, share |  |  |  | 1,000,000 |  |  | 1,000,000 |  |  |  |  |  |
Stock repurchase, shares |  |  |  |  | 199,776 | 562,440 | 75,025 |  |  |  |  |  |
Series A Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Undesignated Preferred stock authorized |  |  |  | 500,000 |  |  |  |  |  |  |  |  |
Preferred stock Par value | $ / shares |  |  |  | $ 0.01 |  |  |  |  |  |  |  |  |
Convertible preferred stock, shares issued |  |  |  | 500,000 |  |  |  |  |  |  |  |  |
Unit preferred stock |  |  |  | 1 |  |  |  |  |  |  |  |  |
Proceeds from common stock | $ |  |  |  | $ 4,900,000 |  |  |  |  |  |  |  |  |

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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=6415400&loc=d3e5070-113901 + Details
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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=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option 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)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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. + 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Percentage of vesting of share-based compensation awards. + 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=6415400&loc=d3e5070-113901 + Details
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- Definition Intrinsic value of equity-based compensation awards vested. Excludes stock and unit options. + References No definition available. + Details
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- Definition 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. + 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=6415400&loc=d3e5070-113901 + Details
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- Definition For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer. + References No definition available. + Details
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- Definition Number of shares issued during the period as a result of the conversion of convertible securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29-30) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 + Details
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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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- Definition The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
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- Definition Number of shares that have been repurchased and retired during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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