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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The cash inflow from the additional capital contribution to the entity.

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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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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).

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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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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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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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Stockholders' Equity and Stock-Based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Proceeds from issuance of common stock, net of issuance costs			$ 10,637	$ 2,263
Weighted-average grant date fair value of the options granted	$ 2.47	$ 3.55	$ 2.34	$ 3.75
Total intrinsic value of options exercised			$ 71	$ 328
Total unrecognized compensation cost related to non-vested share-based compensation arrangements	$ 5,900		$ 5,900
Cost is expected to be recognized over a weighted average period			2 years 10 months 28 days
Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unvested restricted stock awarded			408,750
Weighted-average grant date fair value of restricted stock awarded			$ 7.86
Restricted Stock Units With Market Conditions
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unvested restricted stock awarded			72,870
Restricted Stock Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unvested restricted stock awarded			165,330
Common Stock \| Underwritten Public Offering
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, shares			1,916,667
Common stock, price per share	$ 6.00		$ 6.00
Proceeds from issuance of common stock, net of issuance costs			$ 10,600