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Stockholders' Equity - Additional Information (Details) - USD ($) |  | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 09, 2015 | Dec. 30, 2017 | Dec. 31, 2016 | Jan. 02, 2016 | Jan. 03, 2015 | Dec. 31, 2011 | Dec. 29, 2017 | Aug. 31, 2016 | Aug. 31, 2015 | Jul. 31, 2014 | Feb. 28, 2013 | Feb. 28, 2012
Exercisable period |  | 3 years 7 months 24 days |  |  |  |  |  |  |  |  |  |
Repurchase of shares |  | 843,785 |  |  |  |  |  |  |  |  |  |
Shares reserved |  | 1,451,870 |  |  |  |  |  |  |  |  |  |
Weighted-average grant date fair value of the options granted |  | $ 3.68 | $ 5.06 | $ 3.95 |  |  |  |  |  |  |  |
Total intrinsic value of options exercised |  | $ 300,000 | $ 800,000 | $ 1,500,000 |  |  |  |  |  |  |  |
Total unrecognized compensation cost related to non-vested share-based compensation arrangements |  | $ 4,000,000 |  |  |  |  |  |  |  |  |  |
Cost is expected to be recognized over a weighted average period |  | 3 years 3 months 21 days |  |  |  |  |  |  |  |  |  |
Excess tax benefits from stock-based awards |  | $ 0 |  | $ 0 | $ 0 |  |  |  |  |  |  |
Unvested restricted stock awarded |  | 141,692 | 286,294 | 227,905 |  |  |  |  |  |  |  |
Stock repurchase program authorized amount |  | $ 6,700,000 |  |  |  |  |  |  |  | $ 3,000,000 | $ 3,000,000 | $ 4,000,000
Remaining common stock value authorized to purchase under stock repurchase program lapsed |  |  |  |  |  |  |  | $ 1,000,000 |  |  |  |
Stock repurchase program additional amount authorized |  |  |  |  |  |  |  |  | $ 2,000,000 |  |  |
Stock repurchase, shares |  | 0 | 6,544 | 199,776 |  |  |  |  |  |  |  |
Shares repurchased price, per share |  |  | $ 9.00 | $ 7.92 |  |  |  |  |  |  |  |
Cash paid in exchange to cancel vested stock options to be exercised |  |  |  | $ 275,000 |  |  |  |  |  |  |  |
Number of shares, vested stock options to be exercised, canceled |  | 73,694 | 66,707 | 174,870 |  |  |  |  |  |  |  |
James H. Mackaness |  |  |  |  |  |  |  |  |  |  |  |
Cash paid in exchange to cancel vested stock options to be exercised | $ 275,000 |  |  |  |  |  |  |  |  |  |  |
Number of shares, vested stock options to be exercised, canceled | 92,656 |  |  |  |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |  |  |
Grant of non-qualified stock option |  |  |  |  |  | $ 20,000 |  |  |  |  |  |
The intrinsic value of the restricted stock units |  |  |  |  |  |  | $ 7.62 |  |  |  |  |
Number of shares, vested |  | 80,009 | 30,789 | 209,193 |  |  |  |  |  |  |  |
Restricted stock units released, intrinsic value |  | $ 1,000,000 |  |  |  |  |  |  |  |  |  |
Restricted stock units released, Shares withheld |  | 26,640 |  |  |  |  |  |  |  |  |  |
Restricted stock units released, value withheld |  | $ 333,000 |  |  |  |  |  |  |  |  |  |
Unvested restricted stock awarded |  | 137,391 | 285,005 | 225,392 |  |  |  |  |  |  |  |
Weighted-average grant date fair value of restricted stock awarded |  | $ 9.88 | $ 11.89 | $ 8.66 |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |
Performance Award | Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |  |  |
Unvested restricted stock awarded |  | 123,500 |  |  |  |  |  |  |  |  |  |
Weighted-average grant date fair value of restricted stock awarded |  | $ 9.92 |  |  |  |  |  |  |  |  |  |

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- Definition Aggregate number of common shares reserved for future issuance. + 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 + Details
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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 + Details
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- Definition Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=96864182&loc=d3e11374-113907 + Details
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- Definition The value of restricted shares issued as compensation, net of the value of shares for the payment of withholding taxes. This element is to be used only if shares are used in lieu of cash to satisfy all or a portion of withholding taxes. + References No definition available. + Details
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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 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 + Details
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- Definition Per share weighted average intrinsic value of equity-based compensation awards not vested. Excludes stock and unit options. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + 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)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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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 + Details
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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 + 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=96867065&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=96867065&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=96867065&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=96867065&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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