Stock-Based Compensation - Narrative (Details) - USD ($)	3 Months Ended
Mar. 31, 2019	Apr. 01, 2018	Dec. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of unvested stock options, net of unvested forfeitures	$ 124,000	$ 230,000
Share price (in dollars per share)	$ 0.61
The total intrinsic value of options exercised	$ 0	0
Total cash received from employees as a result of employee stock option exercises	3,600	0
Total stock-based compensation	$ 951,000	$ 432,000
Weighted average estimated fair value (in dollars per share)	$ 1.09		$ 1.23
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted in period	0	0
Total stock-based compensation	$ 25,000	$ 38,000
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, weighted average period	1 year 4 months 24 days
Unrecognized compensation expense	$ 24,000
Unrecognized stock-based compensation expense weighted average period	1 month 15 days
Weighted average estimated fair value (in dollars per share)	$ 0.31	$ 0.46
Common Stock are available for grants	1,200,000
Stock-based compensation expense	$ 49,000	$ 54,000
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	877,000	295,000
Unrecognized compensation expense	$ 3,200,000	$ 2,400,000
Unrecognized stock-based compensation expense weighted average period	1 year 9 months

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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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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Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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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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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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Gross number of share options (or share units) granted during the period.

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Price of a single share of a number of saleable stocks of a company.

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