Stockholders' Equity and Stock-Based Compensation - Summary of Stock Options Outstanding, Vested, Expected to Vest and Exercisable (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 29, 2019	Dec. 29, 2018
Stock options outstanding, exercisable and expected to vest
Options outstanding, Number of Shares	1,405,477	844,898
Options vested and expected to vest, Number of Shares	1,227,921
Options exercisable, Number of Shares	442,940
Options outstanding, Weighted Average Exercise Price	$ 6.68	$ 8.84
Options vested and expected to vest, Weighted Average Exercise Price	6.88
Options exercisable, Weighted Average Exercise Price	$ 8.93
Options outstanding, Weighted Average Remaining Contractual Life (Years)	5 years 3 months 21 days
Options vested and expected to vest, Weighted Average Remaining Contractual Life (Years)	5 years 1 month 9 days
Options exercisable, Weighted Average Remaining Contractual Life (Years)	2 years 7 months 2 days
Options outstanding, Aggregate Intrinsic Value	$ 21
Options vested and expected to vest, Aggregate Intrinsic Value	20
Options exercisable, Aggregate Intrinsic Value	$ 14