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Gross Proceeds from Registered Sale of Equity Securities

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Share-based Compensation Arrangement by Share-based Payment Award, Market Price, Award Vest

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Shares Committed to be Issued Under Stock Incentive Plan

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Underwriting Discounts and Offering Expenses from Registered Sale of Equity Securities

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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- Definition

Maximum number of excess stock shares permitted to be issued.

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The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

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No definition available.

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Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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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).

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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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.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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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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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Per share or per unit amount of equity securities issued.

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Number of new stock issued during the period.

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Value of treasury shares or units reissued. Excludes reissuance of shares or units in treasury for award under share-based payment arrangement.

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Stockholders' Equity and Stock-Based Compensation (Details) - USD ($)				12 Months Ended
	Apr. 10, 2019	Mar. 15, 2019	Apr. 22, 2017	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Shares, New Issues	700,000	7,300,000
Gross Proceeds from Registered Sale of Equity Securities	$ 800,000	$ 8,000,000.0
Shares Issued, Price Per Share	$ 1.10	$ 1.10
Underwriting Discounts and Offering Expenses from Registered Sale of Equity Securities	$ 100,000	$ 700,000
Stock Issued During Period, Value, Treasury Stock Reissued						$ 24,664,250
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	0.80%	8.90%
Excess Stock, Shares Authorized				14,100,000
Stock-based compensation				$ 2,057,400	$ 4,791,054	$ 2,296,131
Shares Committed to be Issued Under Stock Incentive Plan				$ 500,000
Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value				$ 1.60	$ 2.51	$ 3.31	$ 3.21
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount				$ 900,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition				2 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period				645,000	1,549,000	1,152,000
2010 Equity Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares that may be issued				1,400,000
Share-based Payment Arrangement, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period				1 year
Share-based Payment Arrangement, Tranche One [Member] \| Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Market Price, Award Vest				$ 5.25
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate				48.30%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate				1.97%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term				2 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period				640,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period				20 days
Share-based Payment Arrangement, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period				2 years
Share-based Payment Arrangement, Tranche Two [Member] \| Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Market Price, Award Vest				$ 6.00
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate				48.30%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate				1.97%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term				2 years
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate				0.00%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period				150,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period				20 days
Share-based Payment Arrangement, Tranche Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period				4 years
Share-based Payment Arrangement, Tranche Three [Member] \| Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Market Price, Award Vest				$ 7.00
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate				48.30%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate				1.97%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term				2 years
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate				0.00%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period				150,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period				20 days
Period One [Member] \| Unvested Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period				1 year
Period Two [Member] \| Unvested Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period				2 years
Period Three [Member] \| Unvested Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period				4 years
Goertek [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Sale of Stock, Number of Shares Issued in Transaction			7,589,000
Stock Issued During Period, Value, Treasury Stock Reissued			$ 24,664,250
Sale of Stock, Price Per Share			$ 3.25
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners			10.10%
Gain (Loss) on Sale of Treasury Stock			$ 800,000