Stockholders' Equity - Equity Award Activity - Options (Details) - Stock options $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
Mar. 30, 2019 USD ($) $ / shares shares
Number of Stock Options
Stock options, beginning balance (in shares) \| shares	1,115
Stock options, granted (in shares) \| shares	0
Stock options, exercised (in shares) \| shares	0
Stock options, canceled (in shares) \| shares	(145)
Stock options, ending balance (in shares) \| shares	970
Stock options, exercisable (in shares) \| shares	970
Weighted-Average Exercise Price Per Share
Weighted-average exercise price per share, beginning balance (in usd per share) \| $ / shares	$ 8.09
Weighted-average exercise per share, options granted (in usd per share) \| $ / shares	0.00
Weighted-average exercise price per share, options exercised (in usd per share) \| $ / shares	0.00
Weighted-average exercise price per share, options canceled (in usd per share) \| $ / shares	7.05
Weighted-average exercise price per share, ending balance (in usd per share) \| $ / shares	8.24
Average exercise price per share, exercisable (in usd per share) \| $ / shares	$ 8.24
Aggregate Intrinsic Value
Aggregate intrinsic value, beginning balance \| $	$ 0
Aggregate intrinsic value, options exercised \| $	0
Aggregate intrinsic value, ending balance \| $	0
Aggregate intrinsic value, exercisable \| $	$ 0

Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value [Roll Forward]

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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 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.

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

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of fully vested and expected to vest exercisable options that may be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of share options (or share units) exercised during the current period.

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