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 proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.

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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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Unrecognized cost of unvested options awarded to employees as compensation.

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The amount of plan compensation cost recognized during the period.

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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 weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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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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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 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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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Stock-Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, shares in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2016	Sep. 27, 2015	Oct. 02, 2016	Sep. 27, 2015	Jan. 03, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based award vesting period			4 years
Weighted average estimated fair value, options (in dollars per share)	$ 0.46		$ 0.46	$ 0.90
Fair value of unvested stock options, net of unvested forfeitures	$ 1,900,000	$ 2,300,000	$ 1,900,000	$ 2,300,000
Unrecognized stock-based compensation expense weighted average period			3 years 3 months 29 days
The total intrinsic value of options exercised			$ 0	83,000
Total cash received from employees as a result of employee stock option exercises			0	117,000
Total stock-based compensation	$ 457,000	$ 508,000	$ 1,458,000	$ 1,496,000
Weighted average estimated fair value (in dollars per share)	$ 1.92		$ 1.92		$ 2.30
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options maximum contractual term			10 years
Total stock-based compensation	$ 189,000		$ 403,000
RSU
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	154,000		693,000
Unrecognized compensation expense	1,300,000		1,300,000
PRSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	49,000		$ 137,000
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized stock-based compensation expense weighted average period			1 month 15 days
Unrecognized compensation expense	$ 31,000		$ 31,000
Weighted average estimated fair value (in dollars per share)	$ 0.31	$ 0.48	$ 0.31	$ 0.48
Shares available for issuance (in shares)	917		917
Stock-based compensation expense	$ 70,000		$ 225,000