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Stockholders' Equity - Schedule of Stock Option Activity (Details) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 27, 2019 USD ($) $ / shares shares	Dec. 28, 2018 USD ($) $ / shares shares
Shares
Outstanding December 28, 2018 (in shares) | shares	191,808
Granted (in shares) | shares	0
Exercised (in shares) | shares	(31,412)
Canceled/Forfeited (in shares) | shares	0
Outstanding and vested at June 28, 2019 (in shares) | shares	160,396	191,808
Exercisable at September 27, 2019 (in shares) | shares	160,396
Weighted Average Exercise Price
Outstanding December 28, 2018 (in usd per share) | $ / shares	$ 20.23
Granted (in usd per share) | $ / shares	0
Exercised (in usd per share) | $ / shares	20.23
Canceled/Forfeited (in usd per share) | $ / shares	0
Outstanding and vested at September 27, 2019 (in usd per share) | $ / shares	20.23	$ 20.23
Exercisable at September 27, 2019 (in usd per share) | $ / shares	$ 20.23
Aggregate Intrinsic Value
Outstanding and vested | $	$ 3,134	$ 2,129
Exercisable at September 27, 2019 | $	$ 3,134
Weighted-Average Remaining Contractual Term (in years)
Outstanding and vested	6 years 6 months	7 years 2 months 12 days
Exercisable at September 27, 2019	6 years 6 months

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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For presentations that combine terminations, 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 or that expired.

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Weighted average price of options that were either forfeited or expired.

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

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Weighted average remaining contractual term for fully vested and expected to vest exercisable or convertible options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. 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 share options (or share units) exercised during the current period.

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